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Ferranti Mercury

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Ferranti, which had built the Mark I for the university, continued development of the prototype Meg to produce the Mercury. The main change was to replace the Williams tubes with core memory. Although slower to access, at about 10 ÎĽs for a 10-bit short word, the system required virtually no
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Meg first ran in May 1954. The use of solid-state diodes reduced valve count by well over half, reducing the power requirement from the Mark I's 25 kW to the Meg's 12 kW. Like the Mark I, Meg was based on a 10-bit "short word", combining two to form a 20-bit address and four to make a
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Meg could multiply two integers in about 60 microseconds. The floating-point unit used three words for a 30-bit mantissa, and another as a 10-bit exponent. It could add two floating-point numbers in about 180 microseconds, and multiply them in about 360 microseconds.
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unit to greatly improve performance in this role. Additionally the machine was to run at 1 MHz, eight times faster than the Mark I's 125 kHz, leading to the use of the name megacycle machine, and eventually Meg.
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diodes. These were much less expensive than transistors, yet enough of them were used in the design that replacing just the diodes would still result in a significant simplification and improvement in reliability.
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The first of an eventual 19 Mercury computers was delivered in August 1957. Manchester University received one in February 1958, leasing half the time to commercial users via Ferranti's business unit. Both
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and registers, were reliable but required constant maintenance. As soon as the system went into operation, teams started looking at solutions to these problems.
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maintenance, considerably more important for commercial users. 1024Ă—40-bits of core were provided, backed by four drums each holding 4096Ă—40-bits.
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Another team, including the main designers of the Mark I, started with a design very similar to the Mark I but replacing valves used as
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40-bit integer. This was a result of the physical properties of the Williams tubes, which were used to make eight
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The machine could run Mercury Autocode, a simplified coding system of the type later described as a
92:. It first ran in November 1953 and is believed to be the first entirely transistor-based computer. 2339: 1746: 1682: 1659: 1509: 1471: 1307: 1257: 1252: 729: 623: 531: 347: 2292: 2075: 1969: 1933: 1850: 1834: 1676: 1465: 1424: 1412: 1275: 1189: 1110: 875: 536: 479: 134: 2098: 2070: 1980: 1945: 1694: 1688: 1670: 1404: 1398: 1302: 1206: 1097: 1036: 898: 541: 88:
One team decided to produce a much smaller and more cost-effective system built entirely with
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When the Mark I started running in 1951, reliability was poor. The primary concern was the
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At that time computers were used almost always in the sciences, and they decided to add a
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pentodes and diodes that had to be replaced constantly. The Williams tubes, used as
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coding system is included in a downloadable Spanish-language Autocode manual.
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at Harwell also installed theirs in 1958. A Mercury bought in 1959 was the UK
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AUTOCODE un sistema simplificado de codificacion para la computadora MERCURY
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system, which broke down all the time. Additionally, the machine used 4,200
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and using more solid-state components. The computer had roughly 2000
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for improved performance, and increased reliability by replacing the
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Mercury weighed 2,500 pounds (1.3 short tons; 1.1 t).
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Installation of the Ferranti Mercury computer at CERN
2372: 345: 148: 443: 1448:Computer performance by orders of magnitude 174:in Argentina received another one in 1960. 457: 450: 436: 322:"Historia del Departamento de Computación" 2373: 385: 58: 431: 96:later built this commercially as the 1419:Floating-point operations per second 407:(NB. Has info on the character set.) 362: 164:Atomic Energy Research Establishment 292:"History of computers 1959 to 2004" 13: 379: 14: 2402: 411: 394:. The Early Days of Hexadecimal. 346:Garcia Camarero, Ernesto (1961). 103: 2345:Semiconductor device fabrication 2320:History of general-purpose CPUs 547:Nondeterministic Turing machine 398:from the original on 2018-07-16 179:high-level programming language 500:Deterministic finite automaton 356: 339: 314: 284: 259: 237: 215: 31:. It was the successor to the 1: 1291:Simultaneous and heterogenous 363:Weik, Martin H. (June 1957). 208: 203:List of vacuum tube computers 1975:Integrated memory controller 1957:Translation lookaside buffer 1156:Memory dependence prediction 599:Random-access stored program 552:Probabilistic Turing machine 386:Savard, John J. G. (2018) . 133:, or in modern terminology, 27:from the mid-1950s built by 7: 1431:Synaptic updates per second 249:Digital Computer Newsletter 227:Digital Computer Newsletter 191: 149:Commercial version: Mercury 10: 2407: 1835:Heterogeneous architecture 757:Orthogonal instruction set 527:Alternating Turing machine 515:Quantum cellular automaton 172:University of Buenos Aires 62: 51:(mostly type CV2179/A2134 2325:Microprocessor chronology 2312: 2288:Dynamic frequency scaling 2261: 2197: 2135: 2089: 2041: 1996: 1916: 1843: 1812: 1717: 1638: 1602: 1556: 1456: 1443:Cache performance metrics 1382: 1316: 1266: 1177: 1168: 1141: 1096: 1063: 1035: 1026: 846: 749: 738: 609: 465: 16:Early commercial computer 2340:Hardware security module 1683:Digital signal processor 1660:Graphics processing unit 1472:Graphics processing unit 23:was an early commercial 2381:Early British computers 2293:Dynamic voltage scaling 2076:Memory address register 1970:Branch target predictor 1934:Address generation unit 1677:Physics processing unit 1466:Central processing unit 1425:Transactions per second 1413:Instructions per second 1336:Array processing (SIMT) 480:Stored-program computer 170:'s first computer. The 2099:Hardwired control unit 1981:Memory management unit 1946:Memory management unit 1695:Secure cryptoprocessor 1689:Tensor Processing Unit 1671:Vision processing unit 1405:Cycles per instruction 1399:Instructions per cycle 1346:Associative processing 1037:Instruction pipelining 459:Processor technologies 2391:Vacuum tube computers 2182:Sum-addressed decoder 1928:Arithmetic logic unit 1055:Classic RISC pipeline 1009:Epiphany architecture 856:Motorola 68000 series 388:"Computer Arithmetic" 2303:Performance per watt 1881:replacement policies 1547:Package on a package 1437:Performance per watt 1341:Pipelined processing 1111:Tomasulo's algorithm 916:Clipper architecture 772:Application-specific 485:Finite-state machine 198:Manchester computers 94:Metropolitan-Vickers 83:random-access memory 2335:Digital electronics 1988:Instruction decoder 1940:Floating-point unit 1594:Soft microprocessor 1541:System in a package 1116:Reservation station 646:Transport-triggered 162:at Geneva and the 59:Predecessor: Mark I 37:floating point unit 2386:Ferranti computers 2207:Integrated circuit 2051:Processor register 1705:Baseband processor 1050:Operand forwarding 510:Cellular automaton 365:"FERRANTI MERCURY" 302:on 2 February 2002 296:Met Office website 255:(4): 10. Oct 1958. 233:(2): 16. Apr 1955. 2368: 2367: 2257: 2256: 1876:Instruction cache 1866:Scratchpad memory 1713: 1712: 1700:Network processor 1629:Network on a chip 1584:Ultra-low-voltage 1535:Multi-chip module 1378: 1377: 1164: 1163: 1151:Branch prediction 1128:Register renaming 1022: 1021: 1004:VISC architecture 826:Quantum computing 821:VISC architecture 703:Secondary storage 619:Microarchitecture 579:Register machines 267:"CERN-CO-6002912" 75:thermionic valves 65:Manchester Mark 1 2398: 2330:Processor design 2222:Power management 2104:Instruction unit 1965:Branch predictor 1914: 1913: 1612:System on a chip 1554: 1553: 1394:Transistor count 1318:Flynn's taxonomy 1175: 1174: 1033: 1032: 836:Addressing modes 747: 746: 693:Memory hierarchy 557:Hypercomputation 475:Abstract machine 452: 445: 438: 429: 428: 406: 404: 403: 373: 372: 360: 354: 353: 343: 337: 336: 334: 332: 318: 312: 311: 309: 307: 298:. Archived from 288: 282: 281: 279: 277: 263: 257: 256: 241: 235: 234: 219: 2406: 2405: 2401: 2400: 2399: 2397: 2396: 2395: 2371: 2370: 2369: 2364: 2350:Tick–tock model 2308: 2264: 2253: 2193: 2177:Address decoder 2131: 2085: 2081:Program counter 2056:Status register 2037: 1992: 1952:Load–store unit 1919: 1912: 1839: 1808: 1709: 1666:Image processor 1641: 1634: 1604: 1598: 1574:Microcontroller 1564:Embedded system 1552: 1452: 1385: 1374: 1312: 1262: 1160: 1137: 1121:Re-order buffer 1092: 1073:Data dependency 1059: 1018: 848: 842: 741: 740:Instruction set 734: 720:Multiprocessing 688:Cache hierarchy 681:Register/memory 605: 505:Queue automaton 461: 456: 414: 401: 399: 382: 380:Further reading 377: 376: 361: 357: 344: 340: 330: 328: 320: 319: 315: 305: 303: 290: 289: 285: 275: 273: 265: 264: 260: 243: 242: 238: 221: 220: 216: 211: 194: 151: 139:index registers 106: 67: 61: 33:Ferranti Mark 1 17: 12: 11: 5: 2404: 2394: 2393: 2388: 2383: 2366: 2365: 2363: 2362: 2357: 2355:Pin grid array 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1711: 1710: 1708: 1707: 1702: 1697: 1692: 1686: 1680: 1674: 1668: 1663: 1657: 1655:AI accelerator 1652: 1646: 1644: 1636: 1635: 1633: 1632: 1626: 1621: 1618:Multiprocessor 1615: 1608: 1606: 1600: 1599: 1597: 1596: 1591: 1586: 1581: 1576: 1571: 1569:Microprocessor 1566: 1560: 1558: 1557:By application 1551: 1550: 1544: 1538: 1532: 1527: 1522: 1517: 1512: 1507: 1502: 1500:Tile processor 1497: 1492: 1487: 1482: 1481: 1480: 1469: 1462: 1460: 1454: 1453: 1451: 1450: 1445: 1440: 1434: 1428: 1422: 1416: 1410: 1409: 1408: 1396: 1390: 1388: 1380: 1379: 1376: 1375: 1373: 1372: 1371: 1370: 1360: 1355: 1354: 1353: 1348: 1343: 1338: 1328: 1322: 1320: 1314: 1313: 1311: 1310: 1305: 1300: 1295: 1294: 1293: 1288: 1286:Hyperthreading 1278: 1272: 1270: 1268:Multithreading 1264: 1263: 1261: 1260: 1255: 1250: 1249: 1248: 1238: 1237: 1236: 1231: 1221: 1220: 1219: 1214: 1204: 1199: 1198: 1197: 1192: 1181: 1179: 1172: 1166: 1165: 1162: 1161: 1159: 1158: 1153: 1147: 1145: 1139: 1138: 1136: 1135: 1130: 1125: 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672: 669: 667: 664: 663: 662: 661:Memory access 659: 657: 654: 652: 649: 647: 644: 642: 639: 635: 632: 631: 630: 627: 625: 622: 620: 617: 616: 614: 612: 608: 600: 597: 595: 594:Random-access 592: 590: 587: 585: 582: 581: 580: 577: 575: 574:Stack machine 572: 570: 567: 563: 560: 558: 555: 553: 550: 548: 545: 543: 540: 538: 535: 533: 530: 528: 525: 524: 523: 520: 516: 513: 511: 508: 506: 503: 501: 498: 496: 493: 491: 490:with datapath 488: 487: 486: 483: 481: 478: 476: 473: 472: 470: 468: 464: 460: 453: 448: 446: 441: 439: 434: 433: 430: 424: 421: 419: 416: 415: 397: 393: 389: 384: 383: 370: 369:ed-thelen.org 366: 359: 351: 350: 342: 327: 323: 317: 301: 297: 293: 287: 272: 268: 262: 254: 250: 246: 240: 232: 228: 224: 218: 214: 204: 201: 199: 196: 195: 189: 186: 184: 180: 175: 173: 169: 165: 161: 155: 146: 142: 140: 136: 132: 126: 123: 118: 115: 111: 101: 99: 98:Metrovick 950 95: 91: 86: 84: 80: 76: 72: 66: 56: 54: 50: 46: 42: 41:Williams tube 38: 34: 30: 26: 22: 2360:Chip carrier 2298:Clock gating 2217:Mixed-signal 2114:Write buffer 2091:Control unit 1903:Clock signal 1642:accelerators 1624:Cypress PSoC 1281:Simultaneous 1098:Out-of-order 730:Neuromorphic 611:Architecture 569:Belt machine 562:Zeno machine 495:Hierarchical 400:. 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Index

computer
Ferranti
Ferranti Mark 1
floating point unit
Williams tube
core memory
vacuum tubes
pentodes
Manchester Mark 1
drum memory
thermionic valves
EF50
random-access memory
transistors
Metropolitan-Vickers
Metrovick 950
diodes
solid-state
floating-point
accumulator
index registers
CERN
Atomic Energy Research Establishment
Met Office
University of Buenos Aires
high-level programming language
Autocode
Manchester computers
List of vacuum tube computers
"COMPUTERS, Overseas: 5. Manchester University - MANCHESTER UNIVERSITY EXPERIMENTAL COMPUTER "MEG"ACYCLE"

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