Knowledge (XXG)

EDSAC 2

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20-bit instructions with 11-bit addresses, two index registers, microcoded; @ fixed point add: 17–42 microseconds, floating point add: 100–170 microseconds
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used EDSAC 2 to generate a magnetic anomaly map of the seafloor from data collected in the Indian Ocean by
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First calculations were performed on the incomplete machine in 1957. Calculations about
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Vine, Fred J.; Matthews, Drummond H. (1963). "Magnetic anomalies over oceanic ridges".
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5-level paper tape, up to 1000 characters per second read, 300 cps punched output,
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block-structured magnetic tape, 16K words, core memory, added in 1962
188:. EDSAC-2 was decommissioned in 1965, having been superseded by the 151: 116: 228:(4). PDF available by "View PDF" (expand "View on IEEE"): 49–56. 89:
1024 words RAM, 768 words ROM (core memory, 40-bit words)
383: 164:performed on EDSAC-2 in the early 1960s led to the 112: 101: 93: 85: 75: 67: 49: 38: 184:, key evidence that helped support the theory of 403: 138:(EDSAC). It was the first computer to have a 136:Electronic Delay Storage Automatic Calculator 8: 134:(operational in 1958), the successor to the 21: 469:University of Cambridge Computer Laboratory 410: 396: 27: 20: 213: 211: 209: 207: 205: 221:IEEE Annals of the History of Computing 201: 474:History of the University of Cambridge 444:Computer-related introductions in 1958 325:"EDSAC II Arithmetic Unit – Computer" 7: 368: 366: 172:, unsolved as of 2024. And in 1963, 166:Birch and Swinnerton-Dyer conjecture 382:. You can help Knowledge (XXG) by 14: 449:1965 disestablishments in England 370: 353: 218:Wilkes, M.V. (1992). "EDSAC 2". 434:1958 establishments in England 1: 45:, Mathematical Laboratory, UK 378:This computing article is a 268:. 8 August 1957. p. 31. 156:EDSAC 2 modular construction 256:"New computer in Cambridge" 55:; 66 years ago 495: 365: 266:Reed Business Information 26: 170:Millennium Prize Problem 16:Early computer from 1958 459:One-of-a-kind computers 454:Early British computers 331:. UK: Computing History 329:computinghistory.org.uk 149:hardware architecture. 43:University of Cambridge 157: 155: 33:EDSAC 2 users in 1960 362:at Wikimedia Commons 107:two-out-of-five code 295:1963Natur.199..947V 23: 158: 71:Decommisioned 1965 439:1958 in computing 391: 390: 358:Media related to 289:(4897): 947–949. 234:10.1109/85.194055 178:Drummond Matthews 122: 121: 486: 464:40-bit computers 412: 405: 398: 374: 367: 357: 341: 340: 338: 336: 321: 315: 314: 303:10.1038/199947a0 276: 270: 269: 252: 246: 245: 215: 63: 61: 56: 31: 24: 494: 493: 489: 488: 487: 485: 484: 483: 479:Computing stubs 429:1950s computers 419: 418: 417: 416: 350: 345: 344: 334: 332: 323: 322: 318: 278: 277: 273: 254: 253: 249: 217: 216: 203: 198: 186:plate tectonics 162:elliptic curves 140:microprogrammed 59: 57: 54: 34: 17: 12: 11: 5: 492: 490: 482: 481: 476: 471: 466: 461: 456: 451: 446: 441: 436: 431: 421: 420: 415: 414: 407: 400: 392: 389: 388: 375: 364: 363: 349: 348:External links 346: 343: 342: 316: 271: 247: 200: 199: 197: 194: 190:Titan computer 174:Frederick Vine 120: 119: 114: 110: 109: 103: 99: 98: 95: 91: 90: 87: 83: 82: 79: 73: 72: 69: 65: 64: 51: 47: 46: 40: 36: 35: 32: 15: 13: 10: 9: 6: 4: 3: 2: 491: 480: 477: 475: 472: 470: 467: 465: 462: 460: 457: 455: 452: 450: 447: 445: 442: 440: 437: 435: 432: 430: 427: 426: 424: 413: 408: 406: 401: 399: 394: 393: 387: 385: 381: 376: 373: 369: 361: 356: 352: 351: 347: 330: 326: 320: 317: 312: 308: 304: 300: 296: 292: 288: 284: 283: 275: 272: 267: 263: 262: 261:New Scientist 257: 251: 248: 243: 239: 235: 231: 227: 223: 222: 214: 212: 210: 208: 206: 202: 195: 193: 191: 187: 183: 179: 175: 171: 167: 163: 154: 150: 148: 144: 141: 137: 133: 130: 127:was an early 126: 118: 115: 111: 108: 104: 100: 96: 92: 88: 84: 80: 78: 74: 70: 66: 52: 48: 44: 41: 37: 30: 25: 19: 384:expanding it 377: 333:. Retrieved 328: 319: 286: 280: 274: 259: 250: 225: 219: 159: 143:control unit 124: 123: 50:Release date 18: 182:H.M.S. Owen 129:vacuum tube 113:Predecessor 423:Categories 196:References 335:14 August 147:bit-slice 39:Developer 242:11377060 132:computer 68:Lifespan 360:EDSAC 2 311:4296143 291:Bibcode 125:EDSAC 2 94:Storage 58: ( 22:EDSAC 2 309:  282:Nature 240:  145:and a 86:Memory 307:S2CID 238:S2CID 117:EDSAC 102:Input 380:stub 337:2024 176:and 168:, a 60:1958 53:1958 299:doi 287:199 230:doi 77:CPU 425:: 327:. 305:. 297:. 285:. 264:. 258:. 236:. 226:14 224:. 204:^ 192:. 411:e 404:t 397:v 386:. 339:. 313:. 301:: 293:: 244:. 232:: 62:)

Index

Group of people in a room, gathered around a table with paper tape equipment.
University of Cambridge
CPU
two-out-of-five code
EDSAC
vacuum tube
computer
Electronic Delay Storage Automatic Calculator
microprogrammed
control unit
bit-slice

elliptic curves
Birch and Swinnerton-Dyer conjecture
Millennium Prize Problem
Frederick Vine
Drummond Matthews
H.M.S. Owen
plate tectonics
Titan computer





IEEE Annals of the History of Computing
doi
10.1109/85.194055
S2CID
11377060

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