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NEC V20

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In its ruling, the court determined that the microcode in the control store constitutes a computer program, and so is protected by copyright. They further found Intel to have forfeited their copyright by neglecting to ensure that all second-source chips were suitably marked. The court also determined
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of 50%, compared to the 33% duty cycle used by the 8088. The V20 has two 16-bit wide internal databuses, allowing two data transfers to occur concurrently. Differences like that meant that a V20 could typically complete more instructions in a given time than an Intel 8088 running at the same
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In late 1984, Intel again filed suit against NEC, claiming that the microcode in the V20 and V30 infringed its patents for the 8088 and 8086 processors. NEC software engineer Hiroaki Kaneko had studied both the hardware design of the Intel CPUs and the original Intel microcode.
244:. In 1990, an upgrade to the fabrication process technology resulted in the V20H and V20HL, with improved performance and reduced power consumption. Later versions added speeds of 12 and 16 MHz. The V20HLs were also completely static, allowing their clock to be stopped. 661:
A version of the V30 with separate address and data buses and with instruction decode done by hardwired logic rather than a microprogrammed control store. Throughput is twice as high as a V30 for the same clock frequency. The V33 has performance equivalent to
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The V20's ISA includes several instructions not executed by the 8088, with instructions for bit manipulation, packed BCD operations, multiplication, and division. They also include new real-mode instructions from the Intel 80286.
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A single-chip PC platform. The VG230 contained a 16 MHz NEC V30HL processor and IBM PC/XT-compatible core logic, LCD controller (CGA/AT&T640x400) with touch-plane support, keyboard matrix scanner, dual
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The V55PI has extended segment registers called DS2 and DS3, and by shifting the register value by 8 bits to the left and adding an offset value, it is possible to access the entire 16MB address space.
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wide internally. It used an 8-bit external data bus that was multiplexed onto the same pins as the low byte of the address bus. Its 20-bit wide address bus was able to address 1 MB of memory.
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The V55SC not only comes with extended segment registers, called DS2 and DS3, but is also furnished with a two-channel Multi Protocol Serial Controller (MPSC) which is subset of μPD72001/72002.
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instruction is issued to start 8080 emulation. The operand of the instruction specifies an interrupt number whose vector contains the segment:offset where emulation is to begin. To end, a
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Successor to the VG230, it contained a 32 MHz NEC V30MX processor and IBM PC/AT-compatible core logic with dual PICs, LCD controller (640x480), keyboard matrix scanner,
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architecture. The V60 and the V70, which differed mainly in the widths of their respective external address and data busses, both included a V20/V30 emulation mode.
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that NEC did not simply copy Intel's microcode, and that the microcode in the V20 and V30 was sufficiently different from Intel's to not infringe Intel's patents.
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The V30, a nearly identical CPU with a 16-bit wide external data bus, debuted on March 1, 1984. It was pin and object-code compatible with the Intel 8086.
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In 1982, Intel sued NEC over the latter's μPD8086 and μPD8088. This suit was settled out of court, with NEC agreeing to license the designs from Intel.
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instructions, which test, set, clear, and invert single bits of their operands, but are far less efficient than the later
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4.0 hardware support for up to 64 MB, and built-in timer, PIC, DMA, UART and RTC controllers. It was used in the
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with respect to the creation of NEC's Rev.2 microcode, without commenting on it with respect to the Rev.0 code.
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Differs from the V33 in that it has interrupt vector numbers compatible with Intel's 80X86 processors.
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The V20 was fabricated in 2-micron CMOS technology. Early versions ran at speeds of 5, 8, and 10 
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Essentially an NEC V20 with a 16-bit external data bus, the V30 was pin compatible with the
2265: 1338: 912: 842: 305: 133: 8: 1991: 1922: 554: 460: 255: 2060: 1603:"NEC V55SC 16-bit Microprocessor Preliminary Data Sheet (O.D.No ID-8206A, March 1993)" 2202: 2155: 1907: 1713: 1638: 887: 455: 197: 74: 1392:"NEC User's Manual, 16-Bit V Series, 16-/8- and 16-bit microprocessors, Instruction" 1050:
With the V60 processor, NEC departed from the x86 design and launched a new, 32-bit
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Davis, Randy (December 1985 – January 1986). Written at Greenville, Texas, USA.
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series of computers, and in various arcade machines (particularly ones made by
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parallel port interface. Used in the Olivetti PC1, Digisystems Jetta XD, the
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Davis, Stephen R. (1985-12-24). "Turbocharging Your PC with the V-Series".
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keyboard controller. Also integrates full DRAM controller. Was used in the
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instruction is issued in 8080 code. One feature not often employed is the
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instructions for scanning a string of bytes or words (with instructions
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Parker, Rachel (1989-02-13). "Judge Declares Microcode Copyrightable".
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Contreras, Jorge; Handley, Laura; Yang, Terrence (March–May 1990).
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instructions were able to add, subtract, and compare huge packed
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The V20 was reported to have been compatible with the Intel 8087
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Hummel, Robert L. (1988-06-14). "PC Tutor — Mixing Processors".
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Another mode put the processor into a power-saving state via a
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A version of the V35 with the RX116 RTOS in the internal ROM.
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High-speed (up to 16 MHz), low-power version of the V30.
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High-speed (up to 16 MHz), low-power version of the V20.
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An embedded version of the V20, integrated Intel-compatible
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with some extensions. The V20 was introduced in March 1984.
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Integrates a V33 core with 4-channel DMA (μPD71071/i8237),
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keyboard controller. Also integrates full DRAM controller.
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An embedded version of the V30. It is the main CPU in the
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Class 5 central office switch. It was also used in the
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Integrates some peripherals with a V33A core. Used in
1701:"The New NEC Microprocessors - 8080, 8086, Or 8088?" 1455: 404:) while a less or not less condition remained true. 1221:Chodorek, Robert Ryszard (November–December 2021). 1564:"AKAI MPC 3000: The Best Drum Machine of All Time" 1451: 1449: 1639:"IBM Simon — первый в мире смартфон. Что внутри?" 907:(μPD71051/i8251), three timer/counters (μPD71054/ 16:A 16-bit microprocessor introduced by NEC in 1984 2299: 1712:. No. 27. Bend, Oregon, USA. pp. 4–7. 1649: 1154: 1152: 1150: 1486: 1446: 1349: 809:A high-speed, low-voltage version of the V50. 775:A high-speed, low-voltage version of the V40. 1799: 1408: 1199: 1197: 1147: 1332: 1330: 1214: 1661:(PRELIMINARY ed.). NEC. November 1986. 1367: 1177: 1175: 1173: 459:evidence. He also approved of NEC's use of 1937: 1806: 1792: 1779:. Vol. 3, no. 1. pp. 23–72. 1698: 1556: 1194: 700:A microcontroller version of the NEC V30. 466: 27: 1630: 1475: 1429: 1327: 1310: 1308: 1238: 1770: 1619: 1284: 1282: 1220: 1170: 502: 494: 486: 478: 470: 407:The V20 offered a mode that emulated an 279: 1777:Santa Clara High Technology Law Journal 1636: 1536: 1417:"NEC case opened up market for cloning" 1314: 1291:μPD70108 — V20 16-/8-bit Microprocessor 308:numbers stored in memory. Instructions 2323:Computer-related introductions in 1984 2300: 1658:μPD70616 Programmer's Reference Manual 1435: 1384: 1373: 1336: 1305: 1254: 1252: 1250: 1787: 1465:Harvard Journal of Law and Technology 1414: 1279: 1203: 453:The judge in the case accepted NEC's 33:8 MHz V20 in plastic DIP package 2260: 1771:Hinckley, Robert C. (January 1987). 1492: 1181: 1684:. NEC. October 1986. Archived from 1247: 1223:"NEC V20: Inspiring, Inconspicuous" 13: 1745: 1669: 1035:ExCA 2.1 controller and SIR port. 320:. Another family consisted of the 192:that was designed and produced by 14: 2334: 1739: 1637:Nochkin, Alexander (2013-07-10). 750:programmable interval timer, and 726:A high-speed version of the V35. 427:) to be mixed in with 8080 code. 275: 2282: 2281: 2272: 2271: 2259: 2248: 2247: 1501:. United Kingdom. pp. 48–52 1261:1983年 — 16bitマイクロプサッサV30の開発(NEC) 1089: 1077: 1065: 1727:from the original on 2020-02-11 1595: 1574: 1512: 648:High-speed version of the V25. 483:NEC V30 (μPD70116), 10 MHz 1626:Vadem VG230 Developer's Manual 1127:, a Z80 and x86 compatible CPU 631:A version of the V25 with the 557:"PC Transporter" card for the 1: 1582:"V55PI 16-BIT MICROPROCESSOR" 1140: 874:programmable interval timer, 834:programmable interval timer, 380:, which amended the original 212:(ISA) similar to that of the 1415:Lemos, Robert (1998-06-08). 862:Integrates a V30HL core and 822:Integrates a V30HL core and 210:instruction set architecture 7: 2024:NEC Philips Unified Systems 2000:Sharp NEC Display Solutions 1337:Culver, John (2021-09-01). 1315:Mahoney, Bob (1985-10-16). 1101: 437: 219: 49:; 40 years ago 10: 2339: 1979:Japan Aviation Electronics 1838:NEC Corporation of America 1493:Russ, Martin (July 1989). 1184:"NEC V20 processor family" 635:RTOS in the internal ROM. 519: 2231: 2180: 2164: 2138: 2041: 2019:NEC Mobile Communications 2011: 1955: 1946: 1935: 1895: 1830: 1821: 1134:Alternate Instruction Set 942:Sharp Zaurus PI-B304/B308 870:parallel port interface, 830:parallel port interface, 513: 284:Sony CXQ70108D 8 MHz 247:The V20 was described as 172: 167: 148: 132: 116: 111: 101: 96: 61: 43: 38: 26: 1918:Reveal Computer Products 1843:NEC Laboratories America 1260: 618:version of the NEC V20. 516: 2313:NEC x86 microprocessors 1860:NEC Solution Innovators 1813: 1321:The Programmer's Corner 1240:10.1109/MM.2021.3115870 467:Variants and successors 112:Physical specifications 2318:16-bit microprocessors 2146:Walter Tenney Carleton 1848:NEC Software Solutions 1482:Korg M1 Service Manual 1339:"NEC's Forgotten FPUs" 919:). It was used in the 508: 500: 492: 484: 476: 285: 202:object-code compatible 1875:Netcracker Technology 1865:NEC Unified Solutions 1678:V20/V30 User's Manual 1000:2.1 card controller, 506: 498: 491:NEC V33A (μPD70136AL) 490: 482: 474: 283: 1357:"Nec V30 D70116C-10" 1114:-1-based 16-bit RTOS 913:interrupt controller 507:NEC V53A (μPD70236A) 475:V20 on a motherboard 306:binary-coded decimal 62:Common manufacturers 2287:Video game consoles 2130:Video game consoles 1992:Renesas Electronics 1923:Zenith Data Systems 1380:. pp. 377–378. 1210:. pp. 181–186. 882:DMA controller and 792:and S1100, and the 555:Applied Engineering 461:reverse engineering 256:floating-point unit 39:General information 23: 2120:Personal computers 2042:Products, services 1947:Joint ventures and 1525:. p. 316(3f1) 1182:Gennadiy, Shvets. 509: 501: 499:NEC V40 (μPD70208) 493: 485: 477: 286: 22:NEC V20 (μPD70108) 21: 2295: 2294: 2203:NEC Green Rockets 2156:Tadahiro Sekimoto 2037: 2036: 1933: 1932: 1908:Electronic Arrays 1764:cpu-collection.de 1058: 1057: 888:Olivetti Quaderno 228:comprised 63,000 182: 181: 2330: 2285: 2284: 2275: 2274: 2263: 2262: 2251: 2250: 2236:Now wholly owned 2208:NEC Karuizawa 72 2188:NEC Blue Rockets 2151:Kunihiko Iwadare 2029:Sony NEC Optiarc 2004: 1996: 1983: 1975: 1967: 1963:Alaxala Networks 1953: 1952: 1941: 1913:Packard Bell NEC 1828: 1827: 1808: 1801: 1794: 1785: 1784: 1780: 1767: 1755: 1746:Buchty, Rainer. 1735: 1733: 1732: 1726: 1709:Micro Cornucopia 1705: 1692: 1690: 1683: 1663: 1662: 1653: 1647: 1646: 1634: 1628: 1623: 1617: 1616: 1614: 1613: 1608:. pp. 1, 22 1607: 1599: 1593: 1592: 1590: 1589: 1584:. pp. 21–22 1578: 1572: 1571: 1560: 1554: 1553: 1540: 1534: 1533: 1531: 1530: 1524: 1516: 1510: 1509: 1507: 1506: 1490: 1484: 1479: 1473: 1472: 1462: 1453: 1444: 1443: 1433: 1427: 1426: 1412: 1406: 1405: 1403: 1402: 1397:. 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OmniGo 100 1003: 999: 994: 992: 990: 988: 984: 983: 979: 976: 974: 971: 970: 965: 962: 960: 957: 952: 947: 946: 943: 939: 936: 934: 931: 930: 926: 922: 918: 914: 910: 906: 902: 899: 897: 894: 893: 889: 885: 881: 877: 873: 869: 866:peripherals: 865: 861: 858: 856: 853: 852: 848: 844: 841: 837: 833: 829: 826:peripherals: 825: 821: 818: 816: 813: 812: 808: 805: 803: 800: 799: 795: 791: 787: 784: 782: 779: 778: 774: 771: 769: 766: 765: 761: 757: 756:Sharp PC-4500 753: 749: 745: 742: 738: 735: 733: 730: 729: 725: 722: 720: 717: 716: 712: 709: 707: 704: 703: 699: 696: 694: 691: 690: 686: 683: 681: 678: 677: 665: 660: 657: 655: 652: 651: 647: 644: 642: 639: 638: 634: 630: 627: 625: 622: 621: 617: 613: 610: 608: 607: 603: 602: 598: 595: 593: 590: 589: 585: 582: 580: 577: 576: 572: 568: 564: 560: 556: 552: 548: 544: 540: 536: 532: 529: 527: 524: 523: 512: 505: 497: 489: 481: 473: 464: 462: 458: 457: 451: 447: 443: 435: 434:instruction. 428: 410: 405: 402: 396: 390: 384: 362: 356: 350: 344: 339: 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It is both 195: 191: 187: 178: 175: 171: 166: 159: 156: 155: 153: 151: 147: 140: 139: 137: 135: 131: 124: 123: 121: 119: 115: 110: 107: 104: 100: 95: 88: 85: 82: 79: 76: 73: 70: 67: 66: 64: 60: 46: 42: 37: 30: 25: 19: 2264: 2252: 2240: 2235: 2080: 1824:subsidiaries 1776: 1763: 1751: 1729:. Retrieved 1707: 1686:the original 1677: 1657: 1651: 1642: 1632: 1621: 1610:. Retrieved 1597: 1586:. Retrieved 1576: 1567: 1558: 1547: 1538: 1527:. Retrieved 1514: 1503:. Retrieved 1498: 1488: 1477: 1468: 1464: 1442:. p. 8. 1437: 1431: 1420: 1410: 1399:. Retrieved 1386: 1375: 1369: 1360: 1351: 1342: 1320: 1301:. June 1994. 1290: 1270:. Retrieved 1266:the original 1230: 1226: 1216: 1205: 1187: 1163: 1110:, dedicated 1040: 1021: 985: 972: 948: 932: 921:Akai MPC3000 895: 854: 814: 801: 780: 767: 731: 718: 705: 692: 679: 653: 640: 623: 604: 591: 578: 569:'s handheld 525: 454: 452: 448: 444: 441: 429: 406: 340:equivalents 291: 287: 271: 253: 246: 239: 223: 185: 183: 160:NEC μPD72091 150:Co-processor 18: 2218:NEC Shun-Ei 2061:μCOM series 1987:NEC BIGLOBE 1903:NEC BIGLOBE 1748:"Casiorama" 1377:PC Magazine 1207:PC Magazine 1121: [ 1118:NEC μPD9002 954: [ 664:Intel 80286 553:PCS86, the 547:NEC PC-9801 263: [ 237:frequency. 230:transistors 214:Intel 80188 118:Transistors 97:Performance 2302:Categories 1731:2020-02-11 1612:2024-01-21 1588:2024-01-18 1568:Audio Jive 1529:2024-01-05 1505:2022-08-13 1495:"Korg M1R" 1471:: 209–222. 1401:2014-11-25 1272:2020-07-14 1227:IEEE Micro 1141:References 1061:Die photos 937:μPD70236A 925:Akai SG01v 915:(μPD71059/ 890:PT-XT-20. 806:μPD70216H 790:Akai S1000 772:μPD70208H 684:μPD70136A 596:μPD70116H 583:μPD70108H 571:WonderSwan 535:Intel 8086 409:Intel 8080 234:duty cycle 224:The V20's 208:, with an 206:Intel 8088 157:Intel 8087 102:Data width 83:(CXQ70108) 71:(μPD70108) 2277:Computers 1760:"NEC V20" 1718:0747-587X 1439:InfoWorld 1188:CPU-World 1108:NEC RX116 1047:μPD70616 1014:IBM Simon 977:μPD70423 973:NEC V55SC 963:μPD70433 900:μPD70236 859:μPD70280 819:μPD70270 802:NEC V50HL 785:μPD70216 768:NEC V40HL 736:μPD70208 723:μPD70335 710:μPD79021 706:NEC V35HS 697:μPD70330 658:μPD70136 645:μPD70325 628:μPD79011 624:NEC V25HS 611:μPD70320 592:NEC V30HL 579:NEC V20HL 539:GTD-5 EAX 530:μPD70116 517:Part no. 456:cleanroom 204:with the 173:Successor 77:(LH70108) 2254:Category 1722:Archived 1643:habr.com 1102:See also 933:NEC V53A 758:and the 719:NEC V35+ 680:NEC V33A 641:NEC V25+ 559:Apple II 551:Olivetti 549:VM, the 520:Details 514:Product 438:Lawsuits 260:μPD72091 220:Features 89:(Z70108) 44:Launched 2308:NEC V20 2266:Commons 2071:µPD7720 2066:µPD7220 2012:Defunct 1971:Anritsu 1956:Current 1896:Defunct 1831:Current 1694:Alt URL 1096:NEC V53 1084:NEC V50 1072:NEC V30 1042:NEC V60 1033:PC Card 896:NEC V53 855:NEC V51 815:NEC V41 794:Korg M1 781:NEC V50 732:NEC V40 693:NEC V35 654:NEC V33 606:NEC V25 526:NEC V30 411:CPU. A 318:nibbles 249:16-bits 186:NEC V20 177:NEC V60 168:History 106:16 bits 54:1984-03 52: ( 2165:Places 2139:People 1882:Avaloq 1870:Avaloq 1716:  1549:GitHub 998:PCMCIA 911:) and 567:Bandai 545:, the 358:, and 338:i80386 332:, and 300:, and 2181:Other 2113:N343i 2076:R4200 2003:(34%) 1995:(34%) 1982:(25%) 1966:(40%) 1725:(PDF) 1704:(PDF) 1689:(PDF) 1682:(PDF) 1606:(PDF) 1523:(PDF) 1461:(PDF) 1422:ZDNet 1395:(PDF) 1295:(PDF) 1125:] 1112:ITRON 1025:VG330 1023:Vadem 989:VG230 987:Vadem 958:] 951:V55PI 917:i8259 909:i8254 878:PIC, 864:PC-XT 838:PIC, 824:PC-XT 744:USART 672:RETXA 668:BRKXA 633:RX116 421:CALLN 417:RETEM 413:BRKEM 389:REPNE 378:REPNC 322:TEST1 302:CMP4S 298:SUB4S 294:ADD4S 267:] 188:is a 134:Cores 125:63000 87:Zilog 75:Sharp 2241:Sold 2108:e616 2096:V850 1974:(7%) 1714:ISSN 1052:CISC 1012:and 949:NEC 923:and 905:UART 884:8042 880:8237 876:8259 872:8254 868:8255 847:8042 840:8237 836:8259 832:8254 828:8255 752:8255 748:8253 741:8251 670:and 563:Irem 432:HALT 425:IRET 401:CMPS 398:and 395:SCAS 386:and 383:REPE 376:and 374:REPC 334:NOT1 330:CLR1 326:SET1 314:ROR4 312:and 310:ROL4 292:The 200:and 184:The 81:Sony 2091:V60 2086:V25 2081:V20 2056:78K 1887:KMD 1815:NEC 1299:NEC 1235:doi 1010:120 1002:EMS 843:DMA 370:INS 366:EXT 361:BTC 355:BTR 349:BTS 242:MHz 226:die 194:NEC 69:NEC 2304:: 1853:UK 1775:. 1762:. 1750:. 1720:. 1706:. 1566:. 1546:. 1497:. 1467:. 1463:. 1448:^ 1419:. 1359:. 1341:. 1329:^ 1319:. 1307:^ 1297:. 1281:^ 1249:^ 1231:41 1229:. 1225:. 1196:^ 1186:. 1172:^ 1162:. 1149:^ 1123:jp 1016:. 1008:, 956:jp 927:. 796:. 762:. 746:, 614:A 368:, 352:, 346:, 343:BT 328:, 324:, 296:, 265:jp 1807:e 1800:t 1793:v 1766:. 1754:. 1734:. 1615:. 1591:. 1532:. 1508:. 1469:3 1425:. 1404:. 1345:. 1323:. 1275:. 1243:. 1237:: 1190:. 141:1 56:)

Index


NEC
Sharp
Sony
Zilog
16 bits
Transistors
Cores
Co-processor
NEC V60
microprocessor
NEC
pin compatible
object-code compatible
Intel 8088
instruction set architecture
Intel 80188
die
transistors
duty cycle
MHz
16-bits
floating-point unit
μPD72091
jp

binary-coded decimal
nibbles
i80386
BT

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