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NAR 1 or just NAR ( Serbian Na stavni R ačunar, en. Educational Computer ) was a theoretical model of a computer created by Faculty of Mathematics of University of Belgrade professor Nedeljko Parezanović (In Serbian:Недељко Парезановић). It was used for Assembly language and Computer architecture courses.

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21-590: [REDACTED] Look up -nar  or NAR in Wiktionary, the free dictionary. Nar or NAR may refer to: Music [ edit ] Nar (album) by Sahrawi musician Nayim Alal Nar , album by Mercan Dede New Alliance Records , an American punk, spoken word, music-label, active from 1980 to 1998 NAR International  [ it ] , an Italian record label founded in 1980 Places [ edit ] Asia [ edit ] Nar, Nepal ,

42-464: A 5- bit address bus (32 bytes of addressable memory) and 8-bit data bus . Machine instructions were single-byte with three most significant bits specifying the opcode and 5 least significant bits the parameter - memory address . A single 8-bit accumulator register was available and there were no flags or flag registers . Only absolute addressing mode was available and all others were achieved by self-modifying code . Even though this

63-780: A North American real estate agent association National Association of Rocketry , governs model rocketry in the United States Languages [ edit ] Nar, a dialect of the Nar Phu language of Nepal Nar, a dialect of the Sar language of Chad nar, the ISO 639-3 code for the Guta language of Nigeria Religion and mythology [ edit ] Nar, a dwarf of Norse mythology Native American religions , indigenous American religion New Apostolic Reformation ,

84-503: A North American real estate agent association National Association of Rocketry , governs model rocketry in the United States Languages [ edit ] Nar, a dialect of the Nar Phu language of Nepal Nar, a dialect of the Sar language of Chad nar, the ISO 639-3 code for the Guta language of Nigeria Religion and mythology [ edit ] Nar, a dwarf of Norse mythology Native American religions , indigenous American religion New Apostolic Reformation ,

105-465: A dominionist Christian religious movement Technology [ edit ] Nar Mobile , a mobile telecommunications company, located in Baku, Azerbaijan NAR 1 and/or NAR 2 , Na stavni R ačunar (en. Educational Computer ), theoretical models of educational computers Other uses [ edit ] North American Review , a literary magazine founded in 1815 Northern Alberta Railways ,

126-414: A dominionist Christian religious movement Technology [ edit ] Nar Mobile , a mobile telecommunications company, located in Baku, Azerbaijan NAR 1 and/or NAR 2 , Na stavni R ačunar (en. Educational Computer ), theoretical models of educational computers Other uses [ edit ] North American Review , a literary magazine founded in 1815 Northern Alberta Railways ,

147-418: A former Canadian railway Nucleic Acids Research , a biology journal Nursing Assistants-Registered , a medical certification See also [ edit ] NARS (disambiguation) Topics referred to by the same term [REDACTED] This disambiguation page lists articles associated with the title Nar . If an internal link led you here, you may wish to change the link to point directly to

168-418: A former Canadian railway Nucleic Acids Research , a biology journal Nursing Assistants-Registered , a medical certification See also [ edit ] NARS (disambiguation) Topics referred to by the same term [REDACTED] This disambiguation page lists articles associated with the title Nar . If an internal link led you here, you may wish to change the link to point directly to

189-1073: A river in the United Kingdom, and a tributary of the River Great Ouse Nar, North Ossetia–Alania , a village in North Ossetia–Alania , Russia Political organisations [ edit ] National Alliance for Reconstruction , a political party in Trinidad and Tobago New Left Current (Greek: Neo Aristero Revma ), Greek communist organisation Nouvelle Action Royaliste , a political party in France Nuclei Armati Rivoluzionari , Italian right-wing terrorist group Professional bodies [ edit ] National Association of Racing , governs horse racing tracks in Japan National Association of Realtors ,

210-648: A river in the United Kingdom, and a tributary of the River Great Ouse Nar, North Ossetia–Alania , a village in North Ossetia–Alania , Russia Political organisations [ edit ] National Alliance for Reconstruction , a political party in Trinidad and Tobago New Left Current (Greek: Neo Aristero Revma ), Greek communist organisation Nouvelle Action Royaliste , a political party in France Nuclei Armati Rivoluzionari , Italian right-wing terrorist group Professional bodies [ edit ] National Association of Racing , governs horse racing tracks in Japan National Association of Realtors ,

231-657: A village development committee in Manang District in the Gandaki Zone of northern Nepal Nar Jaffar Khan , a town and union council in Bannu District of Khyber-Pakhtunkhwa, Pakistan Nar Township , Samzhubzê District, Tibet Nar, Jammu and Kashmir , a small village in Kotli district, Pakistan-controlled Azad Kashmir Europe [ edit ] När , a village on Gotland, Sweden River Nar ,

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252-415: A village development committee in Manang District in the Gandaki Zone of northern Nepal Nar Jaffar Khan , a town and union council in Bannu District of Khyber-Pakhtunkhwa, Pakistan Nar Township , Samzhubzê District, Tibet Nar, Jammu and Kashmir , a small village in Kotli district, Pakistan-controlled Azad Kashmir Europe [ edit ] När , a village on Gotland, Sweden River Nar ,

273-528: Is not a 'trick'. As memory can not be addressed by a register, the only way to dynamically manipulate memory data is to modify memory manipulation instructions. Above example also contains a typical trick to save memory - instruction (at address 30) is reused as data by another instruction (at address 28). If initial accumulator value can be controlled from the control pane, a 23rd value can be stored in it. Above program has to be only slightly modified - instruction SABF 1 at address 23 has to be changed to SABF 0 and

294-433: Is only a theoretical computer the following physical characteristics were given: Two more instructions were not specified but were commonly present in simulators and took instruction codes 000aaaaa and 111aaaaa: A sample program that sums up an array of 8-bit integers: Above program adds up to 22 8-bit values if executed from address 22: NAR 1 programs are commonly self-modifying. Unlike in some other architectures, this

315-560: The 5 least significant bits specifying the address and will not touch the three bits indicating the instruction until that instruction becomes MUA 0 (10000000 binary = -128 decimal, negative). Once this is decremented by one it becomes 01111111 (+127 decimal) which is no longer negative and will cause the jump-if-negative instruction at 29 to pass, proceeding to "stop the computer" at 30. Similarly to above, this program can add between 22 and 24 values, depending on whether address 22 can be used for both input and output and whether initial value of

336-442: The accumulator can be used as input (the program should then be executed from address 24 and instruction at 23 should be MUA 22). If particular implementation stops the computer if it encounters an unknown opcode or it implements additional unconditional jump instruction with opcode "111aaaaa", then such behaviour can be used as follows: Above, the value of "-1" found at address 31 can either be treated as invalid instruction causing

357-417: The computer to stop or as unconditional jump (BES 31) to the same address, resulting in infinite loop that does not affect the result (control panel can be used to display it). Finally, depending on whether it is decided that a computer will stop program execution if it reaches the end of memory (address 31, will not roll back to address 0), above program can be reorganized to take one value more by eliminating

378-423: The free dictionary. Nar or NAR may refer to: Music [ edit ] Nar (album) by Sahrawi musician Nayim Alal Nar , album by Mercan Dede New Alliance Records , an American punk, spoken word, music-label, active from 1980 to 1998 NAR International  [ it ] , an Italian record label founded in 1980 Places [ edit ] Asia [ edit ] Nar, Nepal ,

399-497: The intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=Nar&oldid=1257747168 " Category : Disambiguation pages Hidden categories: Articles containing Greek-language text Short description is different from Wikidata All article disambiguation pages All disambiguation pages NAR (Redirected from NAR ) [REDACTED] Look up -nar  or NAR in Wiktionary,

420-399: The intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=Nar&oldid=1257747168 " Category : Disambiguation pages Hidden categories: Articles containing Greek-language text Short description is different from Wikidata All article disambiguation pages All disambiguation pages NAR 1 NAR 1 central processing unit has

441-452: The program should be executed from that address (23) and not from 22. Other tricks included the use of the changes of the sign after instruction is modified, as shown in the following example: Here the instruction "MUA 21" at address 23 has the binary value 10010101, which is -107 decimal when treated like signed integer in two's complement . Instructions at addresses 26, 27 and 28 decrement this value by 1 in each iteration. This will modify

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