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ILLIAC II

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The ILLIAC II computer was disassembled roughly a decade after its construction. By this time the hundreds of modules were obsolete scrap; many faculty members took components home to keep. Donald B. Gillies kept 12 (mostly control) modules. His family donated 10 of these modules and the front panel
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Donald W. Gillies, the son of Donald B. Gillies, has a complete set of documentation (instruction set, design reports, research reports, and grant progress reports, roughly 2000 pages) from the ILLIAC II project. He can be contacted for further details about this computer. Most of this documentation
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The ILLIAC II project was proposed before, and competed with IBM's Stretch project, and several ILLIAC designers felt that Stretch borrowed many of its ideas from ILLIAC II, whose design and documentation were published openly as University of Illinois Tech Reports. Members of the ILLIAC II team
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numbers. The check-out period took roughly 3 weeks, during which the computer verified all the previous Mersenne primes and found three new prime numbers. The results were immortalized for more than a decade on a UIUC Postal Annex cancellation stamp, and were discussed in the
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The ILLIAC II was one of the first pipelined computers, along with IBM's Stretch Computer. The pipelined control was designed by faculty member
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should also be available as DCL technical reports in the UIUC Engineering library, although it would not be packaged as a single report.
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to the University of Illinois CS department in 2006. The photos in this article were taken during the time of donation.
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ILLIAC II Modules in April 2005. Liam W. Gillies (grand son of Donald B. Gillies) shows off 8 circuit modules.
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were either 26 bits or 13 bits long, allowing packing of up to four instructions per memory word.
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computer, ILLIAC II was designed using "future transistors" that had not yet been invented.
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numbers used a format with seven bits of exponent (power of 4) and 45 bits of mantissa.
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During check-out of the ILLIAC II, before it became fully operational, faculty member
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Rather than naming the pipeline stages, "Fetch, Decode, and Execute" (as on
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jokingly referred to the competing IBM Project as "St. Retch".
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The ILLIAC II had a division unit designed by faculty member
357:"ILLIAC II – A short Description and Annotated Bibliography" 27:
Supercomputer built by the University of Illinois in 1962.
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The ILLIAC II was the first computer to incorporate
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(Jan 1964). 45:needs additional citations for 290:Guinness Book of World Records 1: 1230:History of computing hardware 255:, invented by faculty member 175:ILLIAC II had 8192 words of 416:"Don Gillies Personal Data" 253:Speed-Independent Circuitry 190:The word size was 52 bits. 1282: 1080:University of Pennsylvania 296:Mathematics of Computation 1065: 988: 983:IBM vacuum tube computers 950: 574: 1266:Transistorized computers 372:10.1109/PGEC.1965.264146 220:transistorized computers 1261:One-of-a-kind computers 1171:UNIVAC family computers 1124:Sperry Rand Corporation 665:Soviet computer systems 432:ILLIAC II documentation 355:Brearley, H.C. (1965), 237:, a co-inventor of the 847:University of Illinois 239:SRT Division algorithm 154:University of Illinois 145: 137: 398:Mathematics of Comput 166:Emitter-coupled logic 143: 135: 1218:Vacuum-tube computer 366:(3), IEEE: 399–401, 54:improve this article 1206:Transistor computer 642:Electronika SS VLSI 908:Harvard University 287:, recorded in the 235:James E. Robertson 146: 138: 18:Illinois ILLIAC II 1248: 1247: 1189:Colossus computer 1177: 1176: 1074: 1073: 1059: 1058: 841: 840: 673: 672: 274:Donald B. Gillies 246:Donald B. Gillies 130: 129: 122: 104: 16:(Redirected from 1273: 977: 970: 963: 954: 948: 928:Harvard Mark III 691: 682: 650: 633: 621: 604: 592: 572: 462: 455: 448: 439: 434:at bitsavers.org 420: 419: 412: 406: 405: 389: 383: 382: 380: 374:, archived from 361: 352: 125: 118: 114: 111: 105: 103: 62: 38: 30: 21: 1281: 1280: 1276: 1275: 1274: 1272: 1271: 1270: 1251: 1250: 1249: 1244: 1194: 1173: 1161: 1142: 1118: 1093: 1070: 1061: 1060: 1055: 1032: 984: 981: 939: 934:Harvard Mark IV 922:Harvard Mark II 902: 837: 814: 669: 653: 644: 627: 615: 598: 586: 563: 528: 505: 488: 471: 466: 428: 423: 414: 413: 409: 391: 390: 386: 378: 359: 354: 353: 349: 345: 318: 305: 270: 257:David E. Muller 222:. Like the IBM 215: 162: 126: 115: 109: 106: 63: 61: 51: 39: 28: 23: 22: 15: 12: 11: 5: 1279: 1277: 1269: 1268: 1263: 1253: 1252: 1246: 1245: 1243: 1242: 1237: 1232: 1227: 1226: 1225: 1215: 1214: 1213: 1202: 1200: 1196: 1195: 1193: 1192: 1185: 1183: 1182:United Kingdom 1179: 1178: 1175: 1174: 1169: 1167: 1163: 1162: 1160: 1159: 1152: 1150: 1144: 1143: 1141: 1140: 1134: 1128: 1126: 1120: 1119: 1117: 1116: 1110: 1103: 1101: 1095: 1094: 1092: 1091: 1084: 1082: 1076: 1075: 1072: 1071: 1068:IBM mainframes 1066: 1063: 1062: 1057: 1056: 1054: 1053: 1048: 1042: 1040: 1034: 1033: 1031: 1030: 1025: 1020: 1015: 1010: 1005: 1000: 995: 989: 986: 985: 982: 980: 979: 972: 965: 957: 951: 945: 941: 940: 938: 937: 931: 925: 919: 916:Harvard Mark I 912: 910: 904: 903: 901: 900: 897:Trusted ILLIAC 894: 888: 882: 876: 870: 864: 858: 851: 849: 843: 842: 839: 838: 836: 835: 829: 822: 820: 816: 815: 813: 812: 806: 800: 794: 788: 782: 776: 770: 764: 758: 752: 746: 740: 734: 728: 722: 716: 710: 704: 697: 695: 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332:ILLIAC III 213:Innovation 80:newspapers 1132:UNIVAC II 993:305 RAMAC 879:ILLIAC IV 867:ILLIAC II 826:FACOM 201 779:MANIAC II 476:Australia 337:ILLIAC IV 261:C-element 150:ILLIAC II 1166:See also 1148:Raytheon 1113:UNIVAC I 1051:AN/FSQ-8 1046:AN/FSQ-7 891:ILLIAC 6 861:ILLIAC I 773:MANIAC I 725:JOHNNIAC 658:See also 327:ILLIAC I 316:See also 170:ILLIAC I 1199:Related 809:Cyclone 803:EDB-2/3 761:SILLIAC 719:IBM 701 613:PS-3000 608:PS-2000 584:ES-2701 483:SILLIAC 224:Stretch 207:Stretch 94:scholar 1191:(1943) 1158:(1953) 1156:RAYDAC 1115:(1951) 1109:(1949) 1090:(1945) 936:(1952) 930:(1949) 924:(1947) 918:(1944) 899:(2006) 893:(2005) 887:(1988) 881:(1965) 875:(1966) 869:(1958) 863:(1952) 857:(1952) 855:ORDVAC 834:(1964) 828:(1960) 811:(1959) 805:(1957) 799:(1957) 793:(1957) 787:(1957) 785:MISTIC 781:(1956) 775:(1956) 769:(1956) 763:(1956) 757:(1957) 751:(1955) 745:(1955) 743:WEIZAC 739:(1952) 737:ORDVAC 733:(1953) 731:ORACLE 727:(1953) 721:(1953) 715:(1953) 709:(1953) 707:AVIDAC 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Index

Illinois ILLIAC II

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University of Illinois
Emitter-coupled logic
ILLIAC I
core memory
magnetic drums
cache
Floating-point
Instructions
Stretch
transistorized computers
Stretch
James E. Robertson
SRT Division algorithm
Donald B. Gillies
Speed-Independent Circuitry
David E. Muller

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