179-477: The ZX Spectrum Vega is a modern redesign of the ZX Spectrum in the form of a miniaturised TV game , created with the involvement of Sir Clive Sinclair . It comes preloaded with several games for the platform. The Vega mimics the look of the original 48k Spectrum computer. However, the keyboard that consisted of 40 rubber keys has been replaced in favour of a simplified layout comprising only 13 buttons. On
358-583: A Timex Sinclair 1000 (TS1000) for as little as $ 10 with the purchase of a C64. This deal meant that the consumer could send the TS1000 to Commodore, collect the rebate, and pocket the difference; Timex Corporation departed the computer market within a year. Commodore's tactics soon led to a price war with the major home computer manufacturers. The success of the VIC-20 and C64 contributed significantly to Texas Instruments and other smaller competitors exiting
537-517: A "ZX81 with colour". According to Sinclair, the team also wanted to combine the ZX81's separate random-access memory sections for audio and video into a single bank. Chief engineer Richard Altwasser was responsible for the ZX Spectrum's hardware design. His main contribution was the design of the semi-custom uncommitted logic array (ULA) integrated circuit, which integrated, on a single chip,
716-712: A "blaze of publicity" at the Earl's Court Computer Show in London, and the ZX Microfair in Manchester . The ZX Spectrum was launched with two models: a 16KB 'basic' version, and an enhanced 48KB variant. The former model had an undercutting price of £125, significantly lower than its main competitor the BBC Micro , whilst the latter model's price of £175 was comparable to a third of an Apple II computer. Upon release,
895-424: A Briton taking on the world, Sinclair has become the best-known name in micros." The media latched onto Sinclair's image; his "Uncle Clive" persona is said to have been created by the gossip columnist for Personal Computer World . The press praised Sinclair as a visionary genius, with The Sun lauding him as "the most prodigious inventor since Leonardo da Vinci ". Adamson and Kennedy wrote that Sinclair outgrew
1074-516: A command in BASIC, many keywords require a single keyboard stroke. Other keywords require a change of keyboard mode by a few keystrokes. The BASIC interpreter is derived from the one used on the ZX81 . A BASIC program for ZX81 can be entered into a ZX Spectrum with minimal modifications. However, Spectrum BASIC introduced numerous additional features, enhancing its usability. The ZX Spectrum character set
1253-414: A compatible video game console , to run these programs today. The C64 is also credited with popularizing the computer demoscene and is still used today by some computer hobbyists . In 2011, 17 years after it was taken off the market, research showed that brand recognition for the model was still at 87%. In January 1981, MOS Technology, Inc., Commodore's integrated circuit design subsidiary, initiated
1432-521: A computer". After its release, computing in Britain became an activity for the general public rather than the preserve of office workers and hobbyists. The ZX81's commercial success made Sinclair Research one of Britain's leading computer manufacturers, with Sinclair himself reportedly "amused and gratified" by the attention the machine received. Development of the ZX Spectrum began in September 1981,
1611-542: A consistent group that's not growing... it's going to shrink as part of our business." One computer gaming executive stated that the Nintendo Entertainment System 's enormous popularity – seven million sold in 1988, almost as many as the number of C64s sold in its first five years – had stopped the C64's growth. Trip Hawkins reinforced that sentiment, stating that Nintendo
1790-617: A custom chip for waveform generation, the C64 could create superior visuals and audio compared to systems without such custom hardware. The C64 dominated the low-end computer market (except in the UK, France and Japan, lasting only about six months in Japan ) for most of the later years of the 1980s. For a substantial period (1983–1986), the C64 had between 30% and 40% share of the US market and two million units sold per year, outselling IBM PC compatibles ,
1969-460: A custom interpreter made it possible to fit all of its functionality into a very small amount of read-only memory (ROM). The development process of the software was marked by disagreements between Nine Tiles and Sinclair Research. Sinclair placed an emphasis on expediting the release of the Spectrum, primarily by minimising alterations in the software from the ZX81, which had in turn been based on
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#17327877569252148-437: A disk drive, and using BASIC 2.0 simplified VIC-20 owners' transition to the 64. "The choice of BASIC 2.0 instead of 4.0 was made with some soul-searching, not just at random. The typical user of a C64 is not expected to need the direct disk commands as much as other extensions, and the amount of memory to be committed to BASIC were to be limited. We chose to leave expansion space for color and sound extensions instead of
2327-462: A few months after the release of the ZX81. Sinclair resolved to make his own products obsolete before his rivals developed the products that would do so. Parts of designs from the ZX80 and ZX81 were reused to ensure a speedy and cost-effective manufacturing process. The team consisted of 20 engineers housed in a small office at 6 King's Parade , Cambridge. During early production, the machine was known as
2506-457: A full range of colour and sound for a price under $ 200. Although it was more enhanced than its British counterpart, sales proved poor and Timex Sinclair collapsed the following year. A crucial part of the company's marketing strategy was to implement regular price-cutting at strategic intervals to maintain market share . Ian Adamson and Richard Kennedy noted that Sinclair's method was driven by securing his leading position through "panicking"
2685-458: A fully hardware-based television raster generator with colour support. This enhancement indirectly provided the new machine with roughly four times the processing power of the ZX81, as the Z80 was relieved of video generation tasks. An initial ULA design flaw occasionally led to incorrect keyboard scanning, which was resolved by adding a small circuit board mounted upside down ("dead cockroach") next to
2864-603: A high of 40 per cent. Sales in the 1984 Christmas season were described as "extremely good". In early 1985 the British press reported the home computer boom to have ended, leaving many companies slashing prices of their hardware to anticipate lower sales. Despite this, celebration of Sinclair's success in the computing market continued at the Which Computer? show in Birmingham , where the five-millionth ZX Spectrum
3043-480: A keyboard, so any software that required a keyboard could not be used. In 1990, an advanced successor to the C64, the Commodore 65 (also known as the "C64DX"), was prototyped, but the project was canceled by Commodore's chairman Irving Gould in 1991. The C65's specifications were impressive for an 8-bit computer, bringing specs comparable to the 16-bit Apple IIGS . For example, it could display 256 colors on
3222-465: A lack of software; although most commercial CP/M software can run on these systems, software media is incompatible between platforms. The low usage of CP/M on Commodores means that software houses saw no need to invest in mastering versions for the Commodore disk format. The C64 CP/M cartridge is also not compatible with anything except the early 326298 motherboards. During the 1980s, the Commodore 64
3401-694: A lacking distribution. Nigel Searle , the newly-appointed chief of Sinclair's computer division, said in June 1982 the company had no plans to stock the new machine in WHSmith , which was at the time Sinclair's only retailer. Searle explained that the mail-order system was in place due to there being no "obvious" retail outlets in the United Kingdom which could sell personal computers, and it made "better sense" financially to continue selling through mail-order. The company's conservative approach to distributing
3580-412: A large spike in 1984 when 2.6 million were sold. After that, sales held steady at between 1.3 and 1.6 million a year for the remainder of the decade and then dropped off after 1989. North American sales peaked between 1983 and 1985 and gradually tapered off afterward, while European sales remained quite strong into the early 1990s. Commodore itself reported a robust sales figure of over 800,000 units during
3759-475: A leftover feature of the unsuccessful MAX Machine. These cartridges map into $ F000 and displace the KERNAL ;ROM. If Ultimax mode is used, the programmer will have to provide code for handling system interrupts. The cartridge port has 16 address lines , which grants access to the computer's entire address space if needed. Disk and tape software normally load at the start of BASIC memory ($ 0801), and use
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#17327877569253938-487: A limited capacity. It was released on 24 April 2015. Also, there was a gold Limited Edition Sinclair ZX Spectrum Vega Made in 2015; only 16 of these consoles were ever made, with 4 of them being backups/spares and 12 of them for a cancelled competition that was to be Held by Sir Clive Sinclair and Retro computers Limited in a Willy Wonka-style campaign where golden tickets were to be given out. ZX Spectrum The ZX Spectrum ( UK : / z ɛ d ɛ k s / )
4117-653: A lower price and more flexible hardware, it quickly outsold many of its competitors. In the United States, the greatest competitors were the Atari 8-bit computers and the Apple II. The Atari 400 and 800 had been designed to accommodate previously stringent FCC emissions requirements and so were expensive to manufacture. Though similar in specifications, the C64 and Apple II represented differing design philosophies; as an open architecture system, upgrade capability for
4296-497: A mid-1984 conference of game developers and experts at Origins Game Fair , Dan Bunten , Sid Meier , and a representative of Avalon Hill said that they were developing games for the C64 first as the most promising market. By 1985, games were an estimated 60 to 70% of Commodore 64 software. Computer Gaming World stated in January 1985 that companies such as Epyx that survived the video game crash did so because they "jumped on
4475-552: A new production process, and a shortage of 1541 disk drives, which also suffered rather severe reliability issues. During 1983, however, a trickle of software turned into a flood and sales began rapidly climbing. Commodore sold the C64 not only through its network of authorized dealers but also through department stores, discount stores, toy stores and college bookstores. The C64 had a built-in RF modulator and thus could be plugged into any television set. This allowed it (like its predecessor,
4654-697: A non-textured surface were at risk of causing shock, and were asked to be sent back to a warehouse in Cambridgeshire which would supply a replacement within 48 hours. Development of the ZX Spectrum+ began in June 1984, and was released on 15 October that year at £179. It was assembled by AB Electronics in South Wales and Samsung in South Korea. This 48 KB Spectrum introduced a new QL -style case with an injection-moulded keyboard and
4833-418: A project feasible and went ahead with ordering 100,000 sets of parts so that he could launch at high volume. On 5 March 1981, the ZX81 was launched worldwide to immense success with more than 1.5 million units sold, 60% of which was outside Britain. According to Ben Rosen , by pricing the ZX81 so low, the company had "opened up a completely new market among people who had never previously considered owning
5012-631: A project to design the graphic and audio chips for a next-generation video game console . Design work for the chips, named MOS Technology VIC-II (Video Integrated Circuit for graphics) and MOS Technology SID (Sound Interface Device for audio), was completed in November 1981. Commodore then began a game console project that would use the new chips—called the Ultimax or the MAX Machine , engineered by Yash Terakura from Commodore Japan. This project
5191-517: A reset button that functions as a switch shorting across the CPU reset capacitor. Electronically, it was identical to the previous 48 KB model. The machine outsold the rubber-key model two to one, however, some retailers reported a failure rate of up to 30%, compared with a more typical 5–6% for the older model. In early 1985, the original Spectrum was officially discontinued, and the ZX Spectrum+
5370-443: A series of television commercials after the C64's launch in late 1982. The company also published detailed documentation to help developers, while Atari initially kept technical information secret. Although many early C64 games were inferior Atari 8-bit ports , by late 1983, the growing installed base caused developers to create new software with better graphics and sound. Rumors spread in late 1983 that Commodore would discontinue
5549-662: A significant commercial failure, selling only 17,000 units and losing Sinclair £7 million. It has since been described as "one of the great marketing bombs of postwar British industry". The ASA ordered Sinclair to withdraw advertisements for the C5 after finding that the company's claims about its safety could not be proved or justified. The combined failures of the C5 and QL caused investors to lose confidence in Sinclair's judgement. In May 1985, Sinclair Research announced their intention to raise an additional £10 to £15 million to restructure
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5728-515: A significant drop in Sinclair's income from orders in January, as retailers were left with surplus stock. Subsequently, an upgraded model, the ZX Spectrum 128, was released in Spain in September 1985, with development financed by the Spanish distributor Investrónica. The launch of this model in the UK was postponed until January 1986 due to the substantial leftover inventory of the prior model. While
5907-469: A small BASIC stub (such as 10 SYS(2064) ) to jump to the start of the program. Although no Commodore 8-bit machine except the C128 can automatically boot from a floppy disk, some software intentionally overwrites certain BASIC vectors in the process of loading so execution begins automatically (instead of requiring the user to type RUN at the BASIC prompt after loading). About 300 cartridges were released for
6086-477: A system lockup or other undesirable side effects if the restore key is accidentally pressed (which activates the NMI thread). The C64 retained the VIC-20's DE-9 Atari joystick port and added another; any Atari-specification game controller can be used on a C64. The joysticks are read from the registers at $ DC00 and $ DC01 , and most software is designed to use a joystick in port 2 for control rather than port 1;
6265-465: A television speaker. The ZX Spectrum +2 marked Amstrad's entry into the Spectrum market shortly after their acquisition of the Spectrum range and "Sinclair" brand in 1986. This machine featured a brand-new grey case with a spring-loaded keyboard, dual joystick ports, and an integrated cassette recorder known as the "Datacorder," akin to the Amstrad CPC 464 . However, it was largely identical to
6444-649: A time, was governed by the BASIC command 'BEEP', where programmers could manipulate parameters for pitch and duration. Furthermore, the processor remained occupied exclusively with the BASIC BEEPs until their completion, limiting concurrent operations. Despite these constraints, it marked a significant step forward from the ZX81 , which lacked any sound capabilities. Resourceful programmers swiftly devised workarounds; its rudimentary audio functionality compelled developers to explore unconventional methods such as programming
6623-419: Is Club Caribe . First released as Habitat in 1988, Club Caribe was introduced by LucasArts for Q-Link customers on their Commodore 64 computers. Users could interact with one another, chat and exchange items. Although the game's open world was very basic, its use of online avatars and the combination of chat and graphics was revolutionary. Online graphics in the late 1980s were severely restricted by
6802-771: Is 20 KB of ROM, made up of the BASIC interpreter, the KERNAL , and the character ROM. Because the processor can only address 64 KB at a time, the ROM was mapped into memory and only 38 911 bytes of RAM (plus 4 KB between the ROMs) were available at startup. Most " breadbin " Commodore 64s used 4164 DRAM with eight chips totaling 64K of system RAM. Later models, featuring Assy 250466 and Assy 250469 motherboards , used 41464 DRAM (64K×4) chips which stored 32 KB per chip (so only two were required). Because 4164 DRAMs are 64K×1, eight chips are needed to make an entire byte;
6981-409: Is a Zilog Z80 , an 8-bit microprocessor , with a clock rate of 3.5 MHz . The original model Spectrum has 16 KB of ROM and either 16 kB or 48 kB of RAM. Video output is channelled through an RF modulator , intended for use with contemporary television sets, to provide a simple colour graphic display. Text is displayed using a grid of 32 columns × 24 rows of characters from
7160-471: Is an 8-bit home computer developed and marketed by Sinclair Research . Considered one of the most influential computers ever made, it is also one of the best-selling British computers ever, with over five million units sold. It was released in the United Kingdom on 23 April 1982, and around the world in the following years, most notably in Europe, the United States, and Eastern Bloc countries. The machine
7339-442: Is commercially available today and under active development. It features a full GUI in character mode, and many other modern features. A version of CP/M was released, but this requires the addition of an external Z80 processor to the expansion bus. Furthermore, the Z80 processor is underclocked to be compatible with the C64's memory bus, so performance is poor compared to other CP/M implementations. C64 CP/M and C128 CP/M both suffer
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7518-504: Is present. The second revision is found on all C64s made from late 1982 through 1985. The final KERNAL ROM revision was introduced on the 250466 motherboard (late breadbin models with 41464 RAM), and is found in all C64Cs. The 6510 CPU is clocked at 1.023 MHz (NTSC) and 0.985 MHz (PAL), lower than some competing systems; the Atari 800, for example, is clocked at 1.79 MHz ). Performance can be boosted slightly by disabling
7697-535: Is significantly more advanced than the ZX81, with approximately four times faster average speeds. The original ZX Spectrum is remembered for its rubber chiclet keyboard , diminutive size and distinctive rainbow motif. It was originally released on 23 April 1982 with 16 KB of RAM for £125 (equivalent to £557 in 2023) or with 48 KB for £175 (equivalent to £780 in 2023); these prices were reduced to £99 (equivalent to £422 in 2023) and £129 (equivalent to £550 in 2023) respectively in 1983. Owners of
7876-445: The MIC port is intended for attachment to other audio devices as a line-in source. The ZX Spectrum integrated various design elements from the ZX81. The keyboard decoding and cassette interfaces were nearly identical, although the latter was programmed for higher-speed loading and saving. The central ULA integrated circuit shares some resemblance with that of the ZX81, but it features
8055-578: The AY-3-8912 chip, MIDI compatibility, an RS-232 serial port, an RGB monitor port, 32 KB of ROM including an improved BASIC editor, and an external keypad. The machine was simultaneously unveiled for the first time and launched in September 1985 at the SIMO '85 trade show in Spain, with a price of 44,250 pesetas . Sinclair later presented the ZX Spectrum 128 at The May Fair Hotel 's Crystal Rooms in London, where he acknowledged that entertainment
8234-592: The Advertising Standards Authority (ASA) in May of that year. Particularly serious were allegations that Sinclair was cashing cheques months before machines were shipped. By autumn 1984, Sinclair was still publicly forecasting that it would be a "million seller" and that 250,000 units would be sold by the end of the year. QL production was suspended in February 1985, and the price was halved by
8413-465: The Apple II , and Atari 8-bit computers . Sam Tramiel, a later Atari president and the son of Commodore's founder, said in a 1989 interview, "When I was at Commodore we were building 400,000 C64s a month for a couple of years." In the UK market, the C64 faced competition from the BBC Micro , the ZX Spectrum , and later the Amstrad CPC 464 , but the C64 was still the second-most-popular computer in
8592-444: The Commodore 1702 monitor, providing even better video quality than a composite signal. Aggressive pricing of the C64 is considered to have been a major catalyst in the video game crash of 1983 . In January 1983, Commodore offered a $ 100 rebate in the United States on the purchase of a C64 to anyone that traded in another video game console or computer. To take advantage of this rebate, some mail-order dealers and retailers offered
8771-530: The Commodore ;64 , BBC Micro , Dragon 32 , and the Amstrad ;CPC range. Over 24,000 different software products were released for the ZX Spectrum. The Spectrum played a pivotal role in the early history of personal computing and video gaming , leaving an enduring legacy that influenced generations. Its introduction led to a boom in companies producing software and hardware ,
8950-627: The Guinness World Records as the highest-selling single computer model of all time, with independent estimates placing the number sold between 12.5 and 17 million units. Volume production started in early 1982, marketing in August for US$ 595 (equivalent to $ 1,880 in 2023). Preceded by the VIC-20 and Commodore PET , the C64 took its name from its 64 kilobytes (65,536 bytes ) of RAM. With support for multicolor sprites and
9129-469: The KERNAL went from two separate chips into one 16 KB ROM chip. The PLA chip and some TTL chips were integrated into a DIL 64-pin chip. The "252535-01" PLA integrated the color RAM as well into the same chip. The smaller physical space made it impossible to put in some internal expansions like a floppy-speeder. In the United States, the 64C was often bundled with the third-party GEOS graphical user interface (GUI)-based operating system, as well as
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#17327877569259308-457: The Telnet protocol. There were major commercial online services , such as Compunet (UK), CompuServe (US – later bought by America Online ), The Source (US), and Minitel (France) among many others. These services usually required custom software which was often bundled with a modem and included free online time as they were billed by the minute. Quantum Link (or Q-Link)
9487-634: The University of Cambridge . By this time inexpensive microprocessors had started appearing on the market, which prompted Sinclair to start producing the MK14 , a computer teaching kit which sold well at a very low price. Encouraged by this success, Sinclair renamed his company to Sinclair Research , and started looking to manufacture personal computers. Keeping the cost low was essential for Sinclair to avoid his products from becoming outpriced by American or Japanese equivalents as had happened to several of
9666-412: The ZX Spectrum character set , or from a custom set. The machine features a colour palette of 15 colours, consisting of seven saturated colours at two levels of brightness, along with black. The image resolution is 256×192 pixels, subject to the same colour limitations. To optimise memory usage, colour is stored separately from the pixel bitmap in a low resolution, 32×24 grid overlay, corresponding to
9845-413: The ZX81 . Rick Dickinson designed its distinctive case, rainbow motif, and rubber keyboard . Video output is transmitted to a television set rather than a dedicated monitor , while application software is loaded and saved onto compact audio cassettes . The ZX Spectrum was initially distributed by mail order, but after severe backlogs it was sold through High Street chains in the United Kingdom. It
10024-469: The 16 KB model could purchase an internal 32 KB RAM upgrade, which for early "Issue 1" machines consisted of a daughterboard . Later issue machines required the fitting of 8 dynamic RAM chips and a few TTL chips. Users could mail their 16K Spectrums to Sinclair to be upgraded to 48 KB versions. Later revisions contained 64 KB of memory but were configured such that only 48 KB were usable. External 32 KB RAM packs that mounted in
10203-642: The 1991 fiscal year, but sales during the 1993 fiscal year had declined to fewer than 200,000 units. Throughout the early 1990s, European sales had accounted for more than 80% of Commodore's total sales revenue. In 1982, Commodore released the MAX Machine in Japan . It was called the Ultimax in the United States and VC-10 in Germany. The MAX was intended to be a game console with limited computing capability and
10382-569: The 40-pin IC package. These are used for two purposes in the C64: to bank-switch the machine's read-only memory (ROM) in and out of the processor's address space, and to operate the datasette tape recorder. The C64 has 64 KB of 8-bit-wide dynamic RAM , 1 KB of 4-bit-wide static color RAM for text mode, and 38 KB are available to built-in Commodore BASIC 2.0 on startup. There
10561-563: The 64C computer, which is functionally identical to the original. The exterior design was remodeled in the sleeker style of the Commodore 128 . The 64C uses new versions of the SID, VIC-II, and I/O chips being deployed. Models with the C64E board had the graphic symbols printed on the top of the keys, instead of the normal location on the front. The sound chip (SID) was changed to use the MOS 8580 chip, with
10740-479: The 64C, a redesigned 64, which Compute! saw as evidence that—contrary to C64 owners' fears that the company would abandon them in favor of the Amiga and 128—"the 64 refuses to die". Its introduction also meant that Commodore raised the price of the C64 for the first time, which the magazine cited as the end of the home-computer price war . Software sales also remained strong; MicroProse , for example, in 1987 cited
10919-415: The Apple II was granted by internal expansion slots, whereas the C64's comparatively closed architecture had only a single external ROM cartridge port for bus expansion. However, the Apple II used its expansion slots for interfacing with common peripherals like disk drives, printers, and modems; the C64 had a variety of ports integrated into its motherboard, which were used for these purposes, usually leaving
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#173278775692511098-580: The Apple II+ (upgraded within months of C64's release to 64 KB with the Apple IIe) and 48 KB for the Atari 800. At upwards of $ 1,200 , the Apple ;II was about twice as expensive, while the Atari 800 cost $ 899. One key to the C64's success was Commodore's aggressive marketing tactics, and they were quick to exploit the relative price/performance divisions between its competitors with
11277-439: The Atari or Apple, like the ability to change color of the character basis across the screen. That gave us a lot of color capability that had not been exploited. With sales booming and the early reliability issues with the hardware addressed, software for the C64 began to grow in size and ambition during 1984. This growth shifted to the primary focus of most US game developers. The two holdouts were Sierra , who largely skipped over
11456-418: The C128 would be 100% compatible with the C64, thereby raising the bar for C64 support. In a case of malicious compliance , the 128 design was altered to include a separate "64 mode" using a complete C64 environment to try to ensure total compatibility. The C64's designers intended the computer to have a new, wedge-shaped case within a year of release, but the change did not occur. In 1986, Commodore released
11635-481: The C64 because "it will sell the most on that system". In Europe, the primary competitors to the C64 were British-built computers: the Sinclair ZX Spectrum , the BBC Micro , and the Amstrad CPC 464 . In the UK, the 48K Spectrum had not only been released a few months ahead of the C64's early 1983 debut, but it was also selling for £175, less than half the C64's £399 price. The Spectrum quickly became
11814-466: The C64 in favor of Apple and PC-compatible machines, and Broderbund , who were heavily invested in educational software and developed primarily around the Apple II. In the North American market, the disk format had become nearly universal while cassette and cartridge-based software all but disappeared. Most US-developed games by this point grew large enough to require multi-loading from disk. At
11993-629: The C64 include Pascal , C , Logo , Forth , and FORTRAN . Compilers for BASIC 2.0 such as Petspeed 2 (from Commodore), Blitz (from Jason Ranheim), and Turbo Lightning (from Ocean Software ) were produced. Most commercial C64 software was written in assembly language, either cross-developed on a larger computer, or directly on the C64 using a machine code monitor or an assembler. This maximized speed and minimized memory use. Some games, particularly adventures, used high-level scripting languages and sometimes mixed BASIC and machine language. Many third-party operating systems have been developed for
12172-539: The C64's 11 + 1 ⁄ 2 -year production. Claims of sales of 17, 22 and 30 million of C64 units sold worldwide have been made. Company sales records, however, indicate that the total number was about 12.5 million. Based on that figure, the Commodore 64 was still the third most popular computing platform into the 21st century until 2017 when the Raspberry Pi family replaced it. While 360,000 C64s were sold in 1982, about 1.3 million were sold in 1983, followed by
12351-450: The C64's price was $ 149 ; with an estimated production cost of $ 35–50 , its profitability was still within the industry-standard markup of two to three times. Commodore sold about one million C64s in 1985 and a total of 3.5 million by mid-1986. Although the company reportedly attempted to discontinue the C64 more than once in favor of more expensive computers such as the Commodore 128 , demand remained strong. In 1986, Commodore introduced
12530-484: The C64, but it was the only non-discontinued, widely available home computer in the US by then, with more than 500,000 sold during the Christmas season; because of production problems in Atari's supply chain, by the start of 1984 "the Commodore 64 largely has [the low-end] market to itself right now", The Washington Post reported. Some of the graphics modes on the 64 are really strange, and they have no analogs to
12709-457: The C64, avoiding the Plus/4's flaws. The successors had many improvements such as a BASIC with graphics and sound commands (like almost all home computers not made by Commodore ), 80-column display ability, and full CP/M compatibility. The decision to make the Commodore 128 plug compatible with the C64 was made quietly by Bowen and Herd, software and hardware designers respectively, without
12888-493: The C64, most arcade conversions were produced by UK developers and converted to NTSC and disk format for the US market, American developers instead focusing on more computer-centered game genres such as RPGs and simulations. In the European market, disk software was rarer and cassettes were the most common distribution method; this led to a higher prevalence of arcade titles and smaller, lower-budget games that could fit entirely in
13067-400: The C64, primarily during the machine's first 2 + 1 ⁄ 2 years on the market, after which most software outgrew the 16 KB cartridge limit. Larger software companies, such as Ocean Software , began releasing games on bank-switched cartridges to overcome the 16 KB cartridge limit during the C64's final years. Commodore did not include a reset button on its computers until
13246-516: The C64. As well as the original GEOS , two third-party GEOS-compatible systems have been written: Wheels and GEOS megapatch. Both of these require hardware upgrades to the original C64. Several other operating systems are or have been available, including WiNGS OS, the Unix-like LUnix, operated from a command-line, and the embedded systems OS Contiki , with full GUI. Other less well-known OSes include ACE, Asterix, DOS/65, and GeckOS . C64 OS
13425-509: The CBM-II line, but third-party cartridges had a reset button. A soft reset can be triggered by jumping to the CPU reset routine at $ FCE2 (64738). A few programs use this as an exit feature, although it does not clear memory. The KERNAL ROM underwent three revisions, mainly designed to fix bugs. The initial version is only found on 326298 motherboards (used in the first production models), and cannot detect whether an NTSC or PAL VIC-II
13604-534: The CPU in Issue 1 ZX Spectrums. The machine's Sinclair BASIC interpreter is stored in 16 KiB ROM, along with essential system routines. The ROM code, responsible for tasks such as floating point calculations and expression parsing , exhibited significant similarities to ZX81, although a few outdated routines remained in the Spectrum ROM. The Spectrum's keyboard is imprinted with BASIC keywords. To input
13783-525: The CPU. Because doing so necessitates swapping out the I/O registers, interrupts must first be disabled. By removing I/O from the memory map, $ D000 – $ DFFF becomes free RAM. C64 cartridges map into assigned ranges in the CPU's address space. The most common cartridge auto-starting requires a string at $ 8000 which contains " CBM80 " followed by the address where program execution begins. A few C64 cartridges released in 1982 use Ultimax mode (or MAX mode),
13962-405: The Commodore 64 also employed colour attributes, it utilised a special multicolour mode and hardware sprites to circumvent attribute clash. Sound output is produced through a built-in beeper capable of generating a single channel with ten octaves. It is controlled by a single EAR bit. By toggling it on and off, simple sounds are generated. This speaker, capable of producing just one note at
14141-630: The Commodore and IBM PC markets as its top priorities. By 1988, PC compatibles were the largest and fastest-growing home and entertainment software markets, displacing former leader Commodore. Commodore 64 software sales were almost unchanged in the third quarter of 1988 year over year while the overall market grew 42%, but the company was still selling 1 to 1.5 million units worldwide each year of what Computer Chronicles that year called "the Model T of personal computers". Epyx CEO Dave Morse cautioned that "there are no new 64 buyers, or very few. It's
14320-580: The Commodore bandwagon early". Over 35% of SSI 's 1986 sales were for the C64, ten points higher than for the Apple II. The C64 was even more important for other companies, which often found that more than half the sales for a title ported to six platforms came from the C64 version. That year, Computer Gaming World published a survey of ten game publishers that found that they planned to release forty-three Commodore 64 games that year, compared to nineteen for Atari and forty-eight for Apple II, and Alan Miller stated that Accolade developed first for
14499-549: The January 1982 Consumer Electronics Show , as recalled by Production Engineer David A. Ziembicki: "All we saw at our booth were Atari people with their mouths dropping open, saying, 'How can you do that for $ 595? ' " The answer was vertical integration ; due to Commodore's ownership of MOS Technology's semiconductor fabrication facilities, each C64 had an estimated production cost of US$ 135 (equivalent to $ 350 in 2022). In July 1983, BYTE magazine stated that "the 64 retails for $ 595 . At that price it promises to be one of
14678-594: The NEB had worsened, however, and by 1979 it opted to break up Sinclair Radionics entirely, selling off its television division to Binatone and its calculator division to ESL Bristol. After incurring a £7 million investment loss, Sinclair was given a golden handshake and an estimated £10,000 severance package. He had a former employee, Christopher Curry , establish a "corporate lifeboat" company named Science of Cambridge Ltd, in July 1977, called such as they were located near
14857-545: The NES. Because of lower incomes and the domination of the ZX Spectrum in the UK, almost all British C64 software used cassette tapes. Few cassette C64 programs were released in the US after 1983 and, in North America, the diskette was the principal method of software distribution. The cartridge slot on the C64 was also mainly a feature used in the computer's first two years on the US market and became rapidly obsolete once
15036-431: The NMI and exits. Run/stop-restore is normally a soft reset in BASIC which restores all I/O registers to their power-on default state, but does not clear memory or reset pointers; any BASIC programs in memory will be left untouched. Machine-language software usually disables run/stop-restore by remapping the NMI vector to a dummy RTI instruction. The NMI can also be used for an extra interrupt thread by programs, but risks
15215-613: The PET over the standard C64's separate components, which could be easily damaged, vandalized, or stolen. Schools did not prefer the Educator 64 to the wide range of software and hardware options the Apple ;IIe was able to offer, and it was produced in limited quantities. Also in 1983, Commodore released the SX-64 , a portable version of the C64. The SX-64 has the distinction of being
15394-565: The ROM were also eliminated, rendering some older 48K and 128K games incompatible with the machine. The ZX Interface 1 was also rendered incompatible due to disparities in ROM and expansion connectors, making it impossible to connect and use the Microdrive units. Production of the +3 was discontinued in December 1990, reportedly in response to Amstrad's relaunch of their CPC range, with an estimated 15% of ZX Spectrums sold being +3 models at
15573-526: The Sinclair QL was in development, Sinclair also hoped to repeat his success with the Spectrum in the fledgling electric vehicle market, which he saw as ripe for a new approach. On 10 January 1985, Sinclair unveiled the Sinclair C5 , a small one-person battery electric recumbent tricycle . It marked the culmination of Sir Clive's long-running interest in electric vehicles. The C5 turned out to be
15752-472: The Spanish alphabet and show messages in Spanish. The appearance of the ZX Spectrum 128 is similar to the ZX Spectrum+, with the exception of a large external heatsink for the internal 7805 voltage regulator added to the right hand end of the case, replacing the internal heatsink in previous versions. This external heatsink led to the system's nickname, "The Toast Rack ". New features included 128 KB RAM with RAM disc commands, three-channel audio via
15931-422: The Spectrum's rubber keyboard was simplified from several hundred components to a conventional moving keyboard down to "four to five" moving parts using a new technology. The keyboard was still undergoing changes as late as February 1982; some sketches included a roundel-on-square key design which was later featured on the later Spectrum+ model. Dickinson recalled in 2007 that "everything was cost driven" and that
16110-700: The UK after the ZX Spectrum. The Commodore 64 failed to make any impact in Japan, as their market was dominated by Japanese computers, such as the NEC PC-8801 , Sharp X1 , Fujitsu FM-7 and MSX , and in France, where the ZX Spectrum, Thomson MO5 and TO7 , and Amstrad CPC 464 dominated the market. Part of the Commodore 64's success was its sale in regular retail stores instead of only electronics or computer hobbyist specialty stores. Commodore produced many of its parts in-house to control costs , including custom integrated circuit chips from MOS Technology . In
16289-540: The United States, it has been compared to the Ford Model T automobile for its role in bringing a new technology to middle-class households via creative and affordable mass-production. Approximately 10,000 commercial software titles have been made for the Commodore ;64, including development tools, office productivity applications, and video games . C64 emulators allow anyone with a modern computer, or
16468-670: The VIC-20) to compete directly against video game consoles such as the Atari 2600 . Like the Apple IIe, the C64 could also output a composite video signal, avoiding the RF modulator altogether. This allowed the C64 to be plugged into a specialized monitor for a sharper picture. Unlike the IIe, the C64's NTSC output capability also included separate luminance/chroma signal output equivalent to (and electrically compatible with) S-Video , for connection to
16647-513: The VIC-II's video output via a register write. This feature is often used by tape and disk fast loaders and the KERNAL cassette routine to keep a standard CPU cycle timing not modified by the VIC-II's sharing of the bus. The restore key is gated directly to the CPU's NMI line, and will generate an NMI if pressed. The KERNAL handler for the NMI checks if run/stop is also pressed; if not, it ignores
16826-515: The VIC-II) and Charles Winterble (manager of MOS Technology), they proposed to Commodore CEO Jack Tramiel a low-cost sequel to the VIC-20. Tramiel dictated that the machine should have 64 KB of random-access memory (RAM). Although 64- Kbit dynamic random-access memory (DRAM) chips cost over US$ 100 (equivalent to $ 283.29 in 2023) at the time, he knew that 64K DRAM prices were falling and would drop to an acceptable level before full production
17005-520: The ZX Spectrum +3 power supply utilised a DIN connector and featured "Sinclair +3" branding on the case. Significant alterations caused a series of incompatibilities, such as the removal of several lines on the expansion bus edge connector. This resulted in complications for various peripheries. Additionally, changes in memory timing led to certain RAM banks being contended, causing failures in high-speed colour-changing effects. The keypad scanning routines from
17184-625: The ZX Spectrum 128 in most technical aspects. The machine retailed for £149. The new keyboard did not feature the BASIC keyword markings seen on earlier Spectrums, except for the keywords LOAD , CODE , and RUN , which were useful for loading software. Instead, the +2 introduced a menu system, almost identical to that of the ZX Spectrum 128, allowing users to switch between 48K BASIC programming with keywords and 128K BASIC programming, where all words, both keywords and others, needed to be typed out in full (though keywords were still stored internally as one character each). Despite these changes,
17363-529: The ZX80's software. The software architecture of the ZX80, however, had been tailored for a severely constrained memory system, and in Nine Tiles' opinion was unsuitable for the enhanced processing demands of the ZX Spectrum. Sinclair favoured solving this with expansion modules on the existing framework like with the ZX81, which Nine Tiles disagreed with. Ultimately, both designs were developed, but Vickers and Nine Tiles were unable to finish their version before
17542-510: The ZX81 Colour or the ZX82 to highlight the machine's colour display, which differed from the black and white of its predecessors. The addendum "Spectrum" was added later on, to emphasise its 15-colour palette. Aside from a new crystal oscillator and extra chips to add additional kilobytes of memory, the ZX Spectrum was intended to be, as quoted by Sinclair's marketing manager, essentially
17721-399: The beeper to emit multiple pitches. Later software became available that allowed for two-channel sound playback. The machine includes an expansion bus edge connector and 3.5 mm audio in/out ports, facilitating the connection of a cassette recorder for loading and saving programs and data. The EAR port has a higher output than the MIC and is recommended for headphones, while
17900-519: The cartridge port free. Commodore's was not a completely closed system, however, the company had published detailed specifications for most of their models since the Commodore PET and VIC-20 days, and the C64 was no exception. C64 sales were nonetheless relatively slow due to a lack of software, reliability issues with early production models, particularly high failure rates of the PLA chip , which used
18079-414: The case was to be more angular and wedge-like, in similar vein to an upgraded ZX81 model. Dickinson later settled on a flatter design with a raised rear section and rounded sides in order to depict the machine as "more advanced" as opposed to a mere upgrade. In drawing up potential logos, Dickinson proposed a series of different logotypes which all featured rainbow slashes across the keyboard. The design of
18258-420: The category of home computers under $ 500 . Despite criticizing its "slow disk drive, only two cursor directional keys, zero manufacturer support, non-standard interfaces, etc.", the magazine said that at the C64's price of less than $ 200 "you can't get another system with the same features: 64K, color, sprite graphics, and barrels of available software". The Tandy Color Computer was the runner up. The Apple II
18437-422: The character cells. In practical terms, this means that all pixels within an 8x8 character block share one foreground colour and one background colour. Altwasser received a patent for this design. An "attribute" consists of a foreground and a background colour, a brightness level (normal or bright) and a flashing "flag" which, when set, causes the two colours to swap at regular intervals. This scheme leads to what
18616-551: The company sold their entire computer product range, along with the "Sinclair" brand name, to Alan Sugar 's Amstrad for £5 million. The takeover sent ripples through the London Stock Exchange , but Amstrad's shares soon recovered, with one stock broker affirming that " the City appears to have taken the news in its stride". Amstrad's acquisition of the brand name saw the release of three ZX Spectrum models throughout
18795-408: The company's Dryburgh factory. Prior to the manufacture of the ZX81, however, Timex had little experience in assembling electronics and had not originally been an obvious choice of manufacturing subcontractor. It was a well-established manufacturer of mechanical watches but was facing a crisis at the beginning of the 1980s; profits had dwindled to virtually zero as the market for watches stagnated in
18974-411: The company. Clive Sinclair became a focal point during the ZX Spectrum's marketing campaign by putting a human face onto the business. Sinclair Research was portrayed in the media as a "plucky" British challenger taking on the technical and marketing might of giant American and Japanese corporations. As David O'Reilly noted in 1986, "by astute use of public relations, particularly playing up his image of
19153-468: The competition. While most companies at the time reduced prices of their products while their market share was dwindling, Sinclair Research discounted theirs shortly after sales had peaked, throwing the competition into "utter disarray". Sinclair Research made a profit of £14 million in 1983, compared to £8.5 million the previous year. Turnover doubled from £27.2 million to £54.5 million, which equated to roughly £1 million for each person employed directly by
19332-403: The computer will not function without all of them present. The first chip contains Bit 0 for the memory space, the second chip contains Bit 1, and so forth. The C64 performs a RAM test on power-up and if a RAM error is detected, the amount of free BASIC memory will be lower than the normal 38,911. If the faulty chip is in lower memory, then an ?OUT OF MEMORY IN 0 error is displayed rather than
19511-445: The computer's memory without requiring multiloads. European programmers also tended to exploit advanced features of the C64's hardware more than their US counterparts. The Commodore 64 Light Fantastic pack was release in time for the 1989 Christmas holiday season. The package included a C64C, a Cheetah Defender 64 Light gun and 3D-glasses. This pack included several games compatible with the light gun, including some developed purely for
19690-419: The core voltage reduced from 12V to 9V. The most significant changes include different behavior in the filters and in the volume control, which result in some music/sound effects sounding differently than intended, and in digitally-sampled audio being almost inaudible, respectively (though both of these can mostly be corrected-for in software). The 64 KB RAM memory went from eight chips to two chips. BASIC and
19869-413: The corner. The console connects to the television via an RCA composite cable and uses a USB cable to draw power. Both cables are hardwired to the back of the console. Since the console is meant to be held like a controller, the size of the unit has been reduced to fit in the hands, and the cables measure around 3 metres so it can be comfortably used with some distance between the screen and the user. On
20048-528: The cost of producing the disk drive. In March 1994, at CeBIT in Hanover , Germany , Commodore announced that the C64 would be finally discontinued in 1995, noting that the Commodore 1541 cost more than the C64 itself. However, only one month later in April 1994, the company filed for bankruptcy . When Commodore went bankrupt, all production on their inventory, including the C64, was discontinued, thus ending
20227-453: The data transfer speed, the team significantly decreased the length of tones that represent binary data. To increase the reliability, a leading period of constant tone was introduced, which allowed the cassette recorder's automatic gain control to settle itself down, eliminating hisses on the tape. A Schmitt trigger was added inside the ULA to reduce noise of the received signal. Originally,
20406-581: The disk features. As a result, you will have to handle the disk in the more cumbersome manner of the 'old days'." The version of Microsoft BASIC is not very comprehensive and does not include specific commands for sound or graphics manipulation, instead requiring users to use the " PEEK and POKE " commands to access the graphics and sound chip registers directly. To provide extended commands, including graphics and sound, Commodore produced two different cartridge-based extensions to BASIC 2.0: Simons' BASIC and Super Expander 64 . Other languages available for
20585-446: The earlier CBM/PET systems and the Atari 400 and Atari 800. This means that no memory space is dedicated to running a disk operating system , as was the case with earlier systems such as the Apple II and TRS-80 . Commodore BASIC 2.0 is used instead of the more advanced BASIC 4.0 from the PET series, since C64 users were not expected to need the disk-oriented enhancements of BASIC 4.0. The company did not expect many to buy
20764-488: The effects of which are still seen. It was among the first home computers aimed at a mainstream audience, with some crediting it as responsible for launching the British information technology industry. The Spectrum is one of the best-selling British computers of all time, retaining the title of Britain's top-selling computer until the Amstrad PCW surpassed it in the 1990s. It was discontinued in 1992. The ZX Spectrum
20943-428: The end of that month. Supply did not return to normal until the 1982 Christmas season, however. Production of the machine rapidly increased with the arrival of the more inexpensive Issue 2 motherboard , a redesign of the main circuit board which addressed hardware manufacturing defects that affected production of the first model. Sales of the ZX Spectrum reached 200,000 in its first nine months, rising to 300,000 for
21122-623: The end of the year. It ultimately flopped, with 139,454 units being manufactured. The ZX Spectrum+, a rebranded ZX Spectrum with identical technical specifications except for the QL-like keyboard, was introduced in October 1984 and made available in WHSmith's stores the day after its launch. Retailers stocked the device in high quantities, anticipating robust Christmas sales. Nevertheless, the product did not perform as well as projected, leading to
21301-439: The essential hardware functions. Altwasser designed a graphics mode that required less than 7 kilobytes of memory and implemented it on the ULA. Vickers wrote most of the ROM code. Lengthy discussions between Altwasser and Sinclair engineers resulted in a broad agreement that the ZX Spectrum must have high-resolution graphics, 16 kilobytes of memory, an improved cassette interface , and an impressive colour palette. To achieve this,
21480-540: The face of competition from the digital and quartz watches . Recognising the trend, Timex's director, Fred Olsen , determined that the company would diversify into other areas and signed a contract with Sinclair. The ZX Spectrum was officially revealed before journalists by Sinclair at the Churchill Hotel in Marylebone , London, on 23 April 1982. Later that week, the machine was officially presented in
21659-407: The field. The price war with Texas Instruments was seen as a personal battle for Commodore president Jack Tramiel. Commodore dropped the C64's list price by $ 200 within two months of its release. In June 1983 the company lowered the price to $ 300 (equivalent to $ 900 in 2023), and some stores sold the computer for $ 199 . At one point, the company was selling as many C64s as all computers sold by
21838-459: The first commercial full-color portable computer . While earlier computers using this form factor only incorporate monochrome ("green screen") displays, the base SX-64 unit features a 5 in (130 mm) color cathode-ray tube (CRT) and one integrated 1541 floppy disk drive. Even though Commodore claimed in advertisements that it would have dual 1541 drives, when the SX-64 was released there
22017-431: The front, it contains a green LED to indicate the power is on, and a micro SD card slot for adding save files and more titles. This micro-console comes pre-loaded with 1000 titles. In 2014, a £100 Sinclair ZX Spectrum Vega retro video game console was announced by Retro Computers and crowdfunded on IndieGogo , with the apparent backing of Clive Sinclair as an investor , but without a full keyboard and manufactured in
22196-482: The hottest contenders in the under- $ 1,000 personal computer market." It described the SID as "a true music synthesizer ... the quality of the sound has to be heard to be believed", while criticizing the use of Commodore BASIC 2.0, the floppy disk performance which is "even slower than the Atari 810 drive", and Commodore's quality control. BYTE gave more details, saying the C64 had "inadequate Commodore BASIC 2.0. An 8K-byte interpreted BASIC" which they assumed
22375-428: The keyboard surprised many users due to its use of rubber keys, described as offering the feel of "dead flesh". Sinclair himself remarked that the keyboard's rubber mould was "unusual", but consumers were undeterred. Despite very high demand, Sinclair Research was "notoriously late" in delivering the ZX Spectrum. Their practice of offering mail-order sales before units were ready ensured a constant cash flow, but meant
22554-462: The knowledge or approval by the management in the post Jack Tramiel era. The designers were careful not to reveal their decision until the project was too far along to be challenged or changed and still make the impending Consumer Electronics Show (CES) in Las Vegas. Upon learning that the C128 was designed to be compatible with the C64, Commodore's marketing department independently announced that
22733-433: The late 1980s, each with varying improvements. By 1990, Sinclair Research consisted of Sinclair and two other employees down from 130 employees at its peak in 1985. The ZX Spectrum was officially discontinued in 1992, after ten years on the market. Sinclair Research thereafter continued to exist as a one-man company, marketing Sir Clive Sinclair's inventions until his death in September 2021. The central processing unit
22912-443: The launch of the Spectrum and it was not used. The distinctive case and colourful design of the ZX Spectrum was the creation of Rick Dickinson , a young British industrial designer who had been hired by Sinclair to design the ZX81. Dickinson was tasked to design a sleeker and more "marketable" appearance to the new machine, whilst ensuring all 192 BASIC functions could fit onto 40 physical keys. Early sketches from August 1981 showed
23091-462: The layout remained identical to that of the 128. The ZX Spectrum +3 , which was launched in 1987, bore a resemblance to its predecessor but introduced a built-in 3-inch floppy disk drive instead of the cassette drive. Initially priced at £249, it later retailed for £199. It was the only Spectrum model capable of running the CP/M operating system without additional hardware. Unlike its predecessors,
23270-400: The left is a segmented directional pad made of hard red plastic for movement. On the right are four grey rectangular rubber keys that are the same size and shape as the original keys, alongside four smaller square rubber buttons on the bottom. In the centre lies the reset button. The iconic rainbow strip that appeared on the bottom right corner of the original has been reduced to a small decal on
23449-500: The machine into 48K mode, keeping the current BASIC program intact (although there is no command to switch back to 128K mode). To enable BASIC programmers to access the additional memory, a RAM disk was created where files could be stored in the additional 80 KB of RAM. The new commands took the place of two existing user-defined-character spaces causing compatibility problems with certain BASIC programs. Unlike its predecessors, it has no internal speaker, and can only produce sound from
23628-469: The machine was criticised, with disillusioned customers telephoning and writing letters. Demand sky-rocketed beyond Sinclair's planned 20,000 monthly unit output to a backlog of 30,000 orders by July 1982. Due to a scheduled holiday at the Timex factory that summer, the backlog had risen to 40,000 units. Sinclair issued a public apology in September that year, and promised that the backlog would be cleared by
23807-572: The market leader and Commodore had an uphill struggle against it in the marketplace. The C64 did however go on to rival the Spectrum in popularity in the latter half of the 1980s. Adjusted to the population size, the popularity of Commodore 64 was the highest in Finland at roughly 3 units per 100 inhabitants, where it was subsequently marketed as "the Computer of the Republic". By early 1985
23986-474: The minimalist, Bauhaus approach to the Spectrum gave it an elegant yet "[non] revolutionary" form. The drawing board on which Dickinson designed the ZX Spectrum is now on display in the Science Museum in London. The need for an improved cassette interface was apparent from the number of complaints received from ZX81 users, who encountered problems when trying to save and load programs. To increase
24165-467: The need to support modem data transfer rates as low as 300 bits per second . Habitat's graphics were stored locally on floppy disk, eliminating the need for network transfer. The C64 uses an 8-bit MOS Technology 6510 microprocessor that is almost identical to the 6502 but has three-state buses , a different pinout , slightly different clock signals and other minor changes for this application. It also has six I/O lines on otherwise-unused legs on
24344-482: The new computer; the latter set a final deadline for the first weekend of January, to coincide with the 1982 Consumer Electronics Show (CES). The product was code named the VIC-40 as the successor to the popular VIC-20 . The team that constructed it consisted of Yash Terakura, Shiraz Shivji , Bob Russell, Bob Yannes, and David A. Ziembicki. The design, prototypes, and some sample software were finished in time for
24523-414: The new memory would be available as eight pages of 16 KB at the top of the address space. The same technique was used to page between the new 16 KB editor ROM and the original 16 KB BASIC ROM at the bottom of the address space. The new sound chip and MIDI out abilities were exposed to the BASIC programming language with the command PLAY and a new command SPECTRUM was added to switch
24702-399: The organisation. Given the loss of confidence in the company, securing the funds proved to be a challenging task. In June 1985, business magnate Robert Maxwell disclosed a takeover bid for Sinclair Research through Hollis Brothers, a subsidiary of his Pergamon Press . However, the deal was terminated in August 1985. The future of Sinclair Research remained uncertain until 7 April 1986, when
24881-434: The packs release (Mindscape.) In the United States, demand for 8-bit computers all but ceased as the 1990s began and PC compatibles completely dominated the computer market. However, the C64 continued to be popular in the UK and other European countries. The machine's eventual demise was not due to lack of demand or the cost of the C64 itself (still profitable at a retail price point between £44 and £50), but rather because of
25060-682: The popular Apple II . The C64 is often credited with starting the demoscene subculture (see Commodore 64 demos ). It is still being actively used in the demoscene, especially for music (its SID sound chip even being used in special sound cards for PCs, and the Elektron SidStation synthesizer). Even though other computers quickly caught up with it, the C64 remained a strong competitor to the later video game consoles Nintendo Entertainment System (NES) and Master System , thanks in part to its by-then established software base, especially outside North America, where it comprehensively outsold
25239-463: The previous Sinclair Radionics products. On 29 January 1980, the ZX80 home computer was launched to immediate popularity; notable for being one of the first computers available in the United Kingdom for less than £100. The company conducted no market research whatsoever prior to the launch of the ZX80; according to Sinclair, he "simply had a hunch" that the public was sufficiently interested to make such
25418-447: The price and reliability of 1541 drives improved. A handful of PAL region games used bank switched cartridges to get around the 16 KB memory limit. As is common for home computers of the early 1980s, the C64 comes with a BASIC interpreter, in ROM. KERNAL, I/O, and tape/disk drive operations are accessed via custom BASIC language commands. The disk drive has its own interfacing microprocessor and ROM (firmware) I/O routines, much like
25597-475: The rear expansion slot were available from third parties. Both machines had 16 KB of onboard ROM. An "Issue 1" ZX Spectrum can be distinguished from Issue 2 or 3 models by the colour of the keys – light grey for Issue 1, blue-grey for later machines. Although the official service manual states that approximately 26,000 of these original boards were manufactured, subsequent serial number analysis shows that only 16,000 were produced, almost all of which fell in
25776-462: The rest of the industry combined. Meanwhile, TI lost money by selling the TI-99/4A for $ 99 . TI's subsequent demise in the home computer industry in October 1983 was seen as revenge for TI's tactics in the electronic calculator market in the mid-1970s, when Commodore was almost bankrupted by TI. All four machines had similar memory configurations which were standard in 1982–83: 48 KB for
25955-463: The role of microcomputer manufacturer and "accepted the mantle of pioneering boffin leading Britain into a technological utopia". Sinclair's contribution to the technology sector resulted in him being knighted upon the recommendation of Margaret Thatcher in the Queen's 1983 Birthday Honours List . The United Kingdom was largely immunised from the effects of the video game crash of 1983 , due to
26134-519: The saturation of home computers such as the ZX Spectrum. The microcomputer market continued to grow and game development was unhindered despite the turbulence in the American markets. Indeed, computer games remained the dominant sector of the British home video game market up until they were surpassed by Sega and Nintendo consoles in 1991. By the end of 1983 there were more than 450 companies in Britain selling video games on cassette, compared to 95
26313-605: The screen, while OCS based Amigas could only display 64 in HalfBrite mode (32 colors and half-bright transformations). Although no specific reason was given for the C65's cancellation, it would have competed in the marketplace with Commodore's lower-end Amigas and the Commodore CDTV . In 1982, the C64's graphics and sound capabilities were rivaled only by the Atari 8-bit computers and appeared exceptional when compared with
26492-540: The serial number range 001-000001 to 001-016000. An online tool now exists to allow users to ascertain the likely issue number of their ZX Spectrum by inputting the serial number. These models experienced numerous changes to its motherboard design throughout its life; mainly to improve manufacturing efficiencies, but also to correct bugs from previous boards. Another issue was with the Spectrum's power supply. In March 1983, Sinclair issued an urgent recall warning for all owners of models bought after 1 January 1983. Plugs with
26671-531: The show, after the team had worked tirelessly over both Thanksgiving and Christmas weekends. The machine used the same case, same-sized motherboard, and same Commodore BASIC 2.0 in ROM as the VIC-20. BASIC also served as the user interface shell and was available immediately on startup at the READY prompt. When the product was to be presented, the VIC-40 product was renamed C64. The C64 made an impressive debut at
26850-486: The software needed to access Quantum Link . The 1541 drive received a matching face-lift, resulting in the 1541C. Later, a smaller, sleeker 1541-II model was introduced, along with the 800 KB 3.5-inch microfloppy 1581 . In 1990, the C64 was repackaged in the form of a game console, called the C64 Games System (C64GS), with most external connectivity removed. A simple modification to the 64C's motherboard
27029-459: The system ROMs and the I/O area at $ D000 . If the KERNAL ROM is swapped out, BASIC will be removed at the same time. BASIC is not active without the KERNAL; BASIC often calls KERNAL routines, and part of the ROM code for BASIC is in the KERNAL ROM. The character ROM is normally invisible to the CPU. The character ROM may be mapped into $ D000 – $ DFFF , where it is then visible to
27208-462: The system took up slightly less than 7 kilobytes of memory, leaving an additional 9 kilobytes to write programs — a figure that pleased the team. Much of the firmware was written by computer scientist Steve Vickers from Nine Tiles, who compiled all control routines to produce the Sinclair BASIC interpreter, a custom variant of the general purpose BASIC programming language. Making
27387-492: The team aimed for data transfer speed of 1000 baud , but succeeded in getting it to work at a considerably faster 1500 baud. Unlike the ZX81, the Spectrum was able to maintain its display during loading and saving operations, and programmers took advantage of this to show a splash screen whilst loading took place in the background. As with the ZX81, the ZX Spectrum was manufactured in Dundee , Scotland, by Timex Corporation at
27566-409: The team had to divorce the central processing unit (CPU) away from the main display to enable it to work at full efficiency – a method which contrasted with the ZX81's integrated CPU. The inclusion of colour to the display proved a major obstacle to the engineers. A Teletext -like approach was briefly considered, in which each line of text would have colour-change codes inserted into it. However, this
27745-713: The time. The +2B model, the only other model still in production at this point, continued to be manufactured, as it was believed not to be in direct competition with other computers in Amstrad's product range. Commodore 64 The Commodore 64 , also known as the C64 , is an 8-bit home computer introduced in January 1982 by Commodore International (first shown at the Consumer Electronics Show , January 7–10, 1982, in Las Vegas ). It has been listed in
27924-489: The upper bits of $ DC00 are used by the keyboard, and an I/O conflict can result. Although it is possible to use Sega gamepads on a C64, it is not recommended; their slightly different signal can damage the CIA chip. The SID chip 's register $ D419 , used to control paddles, is an analog input. A handful of games, primarily released early in the computer's life cycle, can use paddles. In 1986, Commodore released two mice for
28103-511: The usual BASIC startup banner. The C64 uses a complicated memory-banking scheme; the normal power-on default is the BASIC ROM mapped in at $ A000 - $ BFFF , and the screen editor (KERNAL) ROM at $ E000 – $ FFFF . RAM under the system ROMs can be written to, but not read back, without swapping out the ROMs. Memory location $ 01 contains a register with control bits for enabling or disabling
28282-419: The whole of the first year. By August 1983 total sales in Britain and Europe had exceeded 500,000, with the millionth Spectrum manufactured on 9 December 1983. By this point, an average of 50,000 units were being purchased each month. In July 1983, the ZX Spectrum was launched in the United States as the more enhanced Timex Sinclair 2068 . Advertisements described it as offering 72 kilobytes of memory, having
28461-574: The world's first pocket calculator , the Sinclair Executive . By the mid 1970s, Sinclair Radionics was producing handheld electronic calculators, miniature televisions, and the ill-fated digital Black Watch wristwatch. Due to financial losses, Sinclair sought investors from the National Enterprise Board (NEB), who had bought a 43% interest in the company and streamlined his product line. Sinclair's relationship with
28640-402: The year before. An estimated 10,000 to 50,000 people, mostly young men, were developing games out of their homes based on advertisements in popular magazines. The growth of video games during this period has been compared to the punk subculture , fuelled by young people making money from their games. By the mid 1980s, Sinclair Research's share of the British home computer market had climbed to
28819-400: Was "the last hurrah of the 8-bit world". SSI exited the Commodore 64 market in 1991, after most competitors. Ultima VI , released in 1991, was the last major C64 game release from a North American developer, and The Simpsons , published by Ultra Games , was the last arcade conversion. The latter was a somewhat uncommon example of a US-developed arcade port as after the early years of
28998-675: Was a US and Canadian online service for Commodore 64 and 128 personal computers that operated from November 5, 1985, to November 1, 1994. It was operated by Quantum Computer Services of Vienna , Virginia, which in October 1991 changed its name to America Online and continued to operate its AOL service for the IBM PC compatible and Apple Macintosh . Q-Link was a modified version of the PlayNET system, which Control Video Corporation (CVC, later renamed Quantum Computer Services) licensed. The first graphical character-based interactive environment
29177-458: Was based on a cut-down version of the hardware family later used in the C64. The MAX was discontinued months after its introduction because of poor sales in Japan. 1983 saw Commodore attempt to compete with the Apple II 's hold on the US education market with the Educator 64 , essentially a C64 and "green" monochrome monitor in a PET case. Schools preferred the all-in-one metal construction of
29356-409: Was because "Obviously, Commodore feels that most home users will be running prepackaged software - there is no provision for using graphics (or sound as mentioned above) from within a BASIC program except by means of POKE commands." This was one of very few warnings about C64 BASIC published in any computer magazines. Creative Computing said in December 1984 that the C64 was "the overwhelming winner" in
29535-411: Was conceived and designed by engineers at Sinclair Research, founded by English entrepreneur and inventor Clive Sinclair , who was well known for his eccentricity and pioneering ethic. On 25 July 1961, three years after passing his A-levels , he founded Sinclair Radionics Ltd as a vehicle to advertise his inventions and buy components. In 1972, Sinclair had competed with Texas Instruments to produce
29714-478: Was designed by English entrepreneur and inventor Sir Clive Sinclair and his small team in Cambridge , and was manufactured in Dundee , Scotland by Timex Corporation . It was made to be small, simple, and most importantly inexpensive, with as few components as possible. The addendum "Spectrum" was chosen to highlight the machine's colour display, which differed from the black-and-white display of its predecessor,
29893-443: Was dubbed "colour clash" or attribute clash , where a desired colour of a specific pixel could not be selected, but only the colour attributes of an 8x8 block. This became a distinctive feature of the Spectrum, requiring programs, especially games, to be designed with this limitation in mind. In contrast, other machines available at the same time, such as the Amstrad CPC or the Commodore 64 , did not suffer from this limitation. While
30072-583: Was eventually cancelled after just a few machines were manufactured for the Japanese market. At the same time, Robert "Bob" Russell (system programmer and architect on the VIC-20 ) and Robert "Bob" Yannes (engineer of the SID) were critical of the current product line-up at Commodore, which was a continuation of the Commodore PET line aimed at business users. With the support of Al Charpentier (engineer of
30251-428: Was expanded compared to that of the ZX81, which lacked lowercase letters. Spectrum BASIC incorporated extra keywords for better graphics and sound functionality, and support for multi-statement lines was added. The built-in ROM tape modulation software routines for cassette data storage enable data transfers at an average speed of 171 bits per second (bit/s), with a theoretical peak speed of 256 bit/s. The tape modulation
30430-604: Was issued as a prize. The ZX Spectrum's successor, the Sinclair QL , was officially announced on 12 January 1984, shortly before the Apple Macintosh went on sale. Contrasting with its predecessors, the QL was aimed at more serious, professional home users. It suffered from several design flaws; fully operational QLs were not available until the late summer, and complaints against Sinclair concerning delays were upheld by
30609-431: Was made to allow cartridges to be inserted from above. A modified ROM replaced the BASIC interpreter with a boot screen to inform the user to insert a cartridge. Designed to compete with the Nintendo Entertainment System and Sega's Master System , it suffered from very low sales compared to its rivals. It was another commercial failure for Commodore, and it was never released outside Europe. The Commodore game system lacked
30788-526: Was only one and the other became a floppy disk storage slot. Also, unlike most other C64s, the SX-64 does not have a datasette connector so an external cassette was not an option. Two designers at Commodore, Fred Bowen and Bil Herd , were determined to rectify the problems of the Plus/4 . They intended that the eventual successors to the C64—the Commodore 128 and 128D computers (1985)—were to build upon
30967-403: Was reached. The team was able to quickly design the computer because, unlike most other home-computer companies, Commodore had its own semiconductor fab to produce test chips; because the fab was not running at full capacity, development costs were part of existing corporate overhead. The chips were complete by November, by which time Charpentier, Winterble, and Tramiel had decided to proceed with
31146-449: Was reduced in price to £129. In 1985, Sinclair developed the ZX Spectrum 128 (codenamed Derby ) in conjunction with their Spanish distributor Investrónica (a subsidiary of El Corte Inglés department store group). Investrónica had helped adapt the ZX Spectrum+ to the Spanish market after their government introduced a special tax on all computers with 64 KB RAM or less, and a law which obliged all computers sold in Spain to support
31325-583: Was released in the US as the Timex Sinclair 2068 in 1983, and in some parts of Europe as the Timex Computer 2048 . Ultimately the Spectrum was released as seven different models, ranging from the entry level with 16 KB RAM released in 1982 to the ZX ;Spectrum +3 with 128 KB RAM and built-in floppy disk drive in 1987. Throughout its life, the machine primarily competed with
31504-470: Was ruled out, as it was deemed unsuitable for high-resolution graphs or diagrams that involved multiple colour changes. Altwasser devised the idea of allocating a colour attribute to each character position on the screen. This ultimately used eight bits of memory for each character position; three bits to provide any one of eight foreground colours and three bits for the eight background colours , one bit for extra brightness and one bit for flashing. Overall,
31683-421: Was the most common use of home computers. Due to the large number of unsold Spectrum+ models, Sinclair decided not to start it selling in the United Kingdom until January 1986 at a price of £179. The Zilog Z80 processor used in the Spectrum has a 16-bit address bus, which means only 64 KB of memory can be directly addressed. To facilitate the extra 80 KB of RAM the designers used bank switching so
31862-417: Was the winner in the category of home computer over $ 500 , which was the category the Commodore 64 was in when it was first released at the price of $ 595 . Commodore had a reputation for announcing products that never appeared , so sought to quickly ship the C64. Production began in the spring of 1982, and volume shipments began in August. The C64 faced a wide range of competing home computers , but with
32041-481: Was used to run bulletin board systems using software packages such as Punter BBS, Bizarre 64, Blue Board , C-Net, Color 64 , CMBBS, C-Base, DMBBS, Image BBS, EBBS, and The Deadlock Deluxe BBS Construction Kit, often with sysop -made modifications. These boards sometimes were used to distribute cracked software . As late as December 2013, there were 25 such Bulletin Board Systems in operation, reachable via
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