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GEC 2050

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1211:. If any errors or warnings were detected, it would be necessary to load the Minisystem tape again, and to run the editor program to make the corrections, and to generate a new version of the source tape. Otherwise, the source tape could be wound up again, and loaded back into the tape reader for a second pass. This time, it would be read in, haltingly, whilst the paper tape punch worked flat-out to produce the corresponding object tape (usually two or three times longer in length than the Fortran source tape). 1752: 24: 1215:
linking-loader also required the library tape, containing the Fortran library functions, to be loaded into the reader. Both tapes would eventually need to be wound up, but this tended not to be done immediately, because of the programmer's eagerness at finally being in a position to run the program. The user's program (called MAIN) could be called at the Minisystem's prompt.
1764: 1101:, and the offset, v, is specified in the second byte of the instruction. G is a dummy index register whose value is always zero, and hence causes the offsets to be treated as absolute addresses in the zeroth (global) segment. (Incidentally, since X3 is the standard index register, the assembler program allows ',X3,address' to be abbreviated to ',address'.) 1161:). This tape, which was stored in a small cardboard box on a shelf near the computer, would be entered from the left of the tape-reader. The tape-reader was an integral part of the front panel of the computer, and would spill out the tape that it had read, on to the floor, on the right-hand side. Once read, the Minisystem could be started by flicking the 1180:'displayed' at a time (physically printing it out on the paper); inserted text was printed below the point in the line where it was being inserted, and the rubout key merely crossed-out the text that was to be deleted; the string-find and string-substitute facilities were very rudimentary; and the teleprinter worked at 110 1214:
At the end, with two tapes all over the floor, the Minisystem would have to be read once again, whilst the object and source tapes were being wound up. The linking-loader program, LINK, could then be called from the keyboard, at the Minisystem's prompt, and the object tape fed through the reader. The
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would not both fit in memory together, so the next stage would be to load the Fortran compiler tape (which was stored in another cardboard box on the shelf in the computer room). Whilst this was being read in, and spilling out the other side, the newly punched source tape could be torn off from the
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At the end of the edit session, the new version of the source program would be output: both as a typed listing, and as a new punched tape. Whilst the paper-tape punch was doing this, again spilling out its product (albeit not so fast as the reader, and off to the left of the machine) from its front
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The conditional jump instructions are listed in pairs, the former opcode is for a forward jump, and the latter one for a backward jump. Again, the offset of the jump is obtained from the second byte of the instruction. Thus, all instructions in rows 0 to 7 and row 9 consist of two bytes (the opcode
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program, EDIT, could then be called from the teleprinter keyboard, at the Minisystem's '>' prompt. The programmer would then load the source tape into the reader, and while this, too, was being read in, and spilled out all over the floor, the programmer could be busy winding up the Minisystem
1117:, S, into index register X2. This allows very simple non-recursive subroutine calls to be achieved. More complex subroutine calls involve the use of the PREP instruction, which saves the return information in the first bytes of the current memory segment. Such calls, too, cannot be recursive. 1179:
Eventually, once the source tape had finished being read, the text editor program would prompt for a new command, which was the invitation to edit the program. Though having changed little in effect over the decades, editing has changed enormously in feeling: only one line of the program was
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panel mounting, the programmer could be winding up the old version of the source tape, for it to be kept as a backup version. The free end of the new tape, which was still being punched out, could be labelled in pencil with its program name, version number, and date of punching.
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register, A, can be set to be 1, 2, 3 or 4 bytes in length, using the SETL instructions. This controls how many bytes are loaded (or stored) in a memory-access instruction. The JIL instruction performs a Jump Indirect, like the JI instruction, but saves the value of the
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free end that was protruding out of the punch, and wound up using the hand winch. It would be loaded into the tape reader once the compiler had finished being read in, and the compiler tape would be wound back into a tidy reel.
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Using the opcode 29 as an illustration, the assembler code (AD X2,X1,offset) causes the contents of the memory location 'offset(X1)' to be added to register X2. Thus, register X1 is being used as the
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Depending on what happened during the program execution, the programmer might need to read the newest source tape back in to the editor program, yet again, ready to go round the
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of the program. He would first need to turn on the computer at the switch on the conventional mains socket on the wall, and then at the front-panel on/off switch. Since the
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system, and GEC Computers sold a complete RJE package including the system, peripherals, and RJE software. Another
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COMMAND >L L 049A A 0522 D 063E LINK 0691 EDIT 1090 MAIN 155E 28A2 3FFF >
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paper listing of that program that has been annotated with the new changes that are to be made, and the
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The first pass of the source tape through the tape reader was generally used just for checking for
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This section describes a work session on this computer, at one typical installation in 1975. The
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and a data byte) while all the other instructions consist of just a single opcode byte.
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produced during the 1970s, initially by Marconi Elliott Computer Systems of the
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Unfortunately, with only 16 KiBytes of core store, the Minisystem and Fortran
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application was a ticketing system, whose customers included
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tape, into a tidy reel again, using a hand-turned winch.
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is sufficiently simple to be tabulated in its entirety:
209:, and used the same peripheral I/O controllers as the 1725: 1684: 1634: 1603: 1596: 1565: 1437: 1401: 1333: 48:. Unsourced material may be challenged and removed. 1157:(containing the object code of a small, memory 1733:GEC-Marconi scientist deaths conspiracy theory 1311: 8: 1600: 1318: 1304: 1296: 1203:in the program, so the generation of the 108:Learn how and when to remove this message 1811:Computers designed in the United Kingdom 231: 1247: 7: 1763: 1393:Vickers Shipbuilding and Engineering 150:The GEC 2050 was commonly used as a 135:, before the company renamed itself 46:adding citations to reliable sources 1141:that contains the machine-readable 1672:South African Class 10E1, Series 2 1667:South African Class 10E1, Series 1 14: 1285:GEC 2050 Remote Job Entry Station 1258:. 22 October 2019. Archived from 1762: 1751: 1750: 1662:South African Class 9E, Series 2 1657:South African Class 9E, Series 1 1452:Associated Electrical Industries 139:. The first models were labeled 22: 1515:Robert Stephenson and Hawthorns 185:The GEC 2050 supported up to 64 33:needs additional citations for 1419:GEC Plessey Telecommunications 1: 1542:Radio & Allied Industries 1207:from the tape punch would be 1165:switch on the front panel. 1129:might arrive, to work on a 201:). The system had a single 1827: 1368:Marconi Electronic Systems 1220:software development cycle 205:for performing autonomous 1746: 1647:GEC Stephenson locomotive 1483:Siemens Brothers & Co 1327:General Electric Company 1462:British Thomson-Houston 1383:Marconi Research Centre 143:, before being renamed 1652:South African Class 4E 1578:Marconi Communications 1530:Willans & Robinson 1409:Alenia Marconi Systems 1283:Computing at Chilton, 154:station, supporting a 1642:British Rail Class 91 1488:William Thomas Henley 1429:Thomson Marconi Sonar 1402:Former joint ventures 1358:Hirst Research Centre 1256:"2050 Sales Brochure" 1232:GEC Computers Limited 180:Arsenal Football Club 137:GEC Computers Limited 1537:Gilbarco Veeder-Root 1520:Ruston & Hornsby 1500:Dick, Kerr & Co. 1478:Metropolitan-Vickers 1147:magnetic core memory 191:magnetic-core memory 42:improve this article 1557:Yarrow Shipbuilders 1424:Matra Marconi Space 1378:Marconi-Osram Valve 1373:Marconi Instruments 1334:Former subsidiaries 1151:non-volatile memory 1290:GEC 2050 processor 1262:on 22 October 2019 203:Channel Controller 172:mainframe computer 1778: 1777: 1680: 1679: 1447:A.B. Dick Company 1095: 1094: 118: 117: 110: 92: 1818: 1806:Remote job entry 1766: 1765: 1754: 1753: 1717:Arnold Weinstock 1601: 1505:Elliott Brothers 1495:English Electric 1440:and acquisitions 1320: 1313: 1306: 1297: 1272: 1271: 1269: 1267: 1252: 232: 152:Remote Job Entry 113: 106: 102: 99: 93: 91: 50: 26: 18: 1826: 1825: 1821: 1820: 1819: 1817: 1816: 1815: 1801:8-bit computers 1781: 1780: 1779: 1774: 1742: 1721: 1707:Martin Sixsmith 1676: 1630: 1616:GEC 4000 series 1592: 1561: 1552:W & T Avery 1510:Marconi Company 1439: 1433: 1397: 1363:Marconi Company 1335: 1329: 1324: 1280: 1275: 1265: 1263: 1254: 1253: 1249: 1245: 1237:GEC 4000 series 1228: 1169: 1159:monitor program 1123: 1121:User experience 1115:program counter 227:instruction set 219: 217:Instruction set 211:GEC 4000 series 114: 103: 97: 94: 51: 49: 39: 27: 12: 11: 5: 1824: 1822: 1814: 1813: 1808: 1803: 1798: 1793: 1783: 1782: 1776: 1775: 1773: 1772: 1760: 1747: 1744: 1743: 1741: 1740: 1738:Phoebus cartel 1735: 1729: 1727: 1723: 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Retrieved 1260:the original 1250: 1217: 1213: 1208: 1198: 1190: 1186: 1178: 1170: 1162: 1154: 1124: 1107: 1103: 1096: 220: 184: 170:to a remote 160:line printer 156:punched card 149: 144: 140: 129:minicomputer 121: 119: 104: 95: 85: 78: 71: 64: 52: 40:Please help 35:verification 32: 15: 1635:Locomotives 1573:BAE Systems 1468:Edison Swan 1414:GEC Alsthom 1222:once more. 1205:object tape 1173:text editor 1149:, which is 1143:source code 1135:teleprinter 1110:accumulator 584:LCP A,X3,v 572:XOR A,X3,v 560:AND A,X3,v 490:CP X3,X3,v 478:AD X3,X3,v 466:ST X3,X3,v 454:LD X3,X3,v 437:CP X2,X3,v 425:AD X2,X3,v 413:ST X2,X3,v 401:LD X2,X3,v 384:CP X1,X3,v 372:AD X1,X3,v 360:ST X1,X3,v 348:LD X1,X3,v 1785:Categories 1697:Hugo Hirst 1566:Successors 1292:(archived) 1243:References 1209:suppressed 1155:Minisystem 1139:punch tape 1127:programmer 1091:CPR X1,X2 1067:SBR AL,X1 1055:ADR AL,X1 1038:LDR AM,X1 1002:LDR AL,X2 973:LCP IP,X2 961:XOR IP,X2 949:AND IP,X2 649:DECS X3,v 637:CLRS X3,v 596:SB A,X3,v 581:LCP A,X2,v 578:LCP A,X1,v 569:XOR A,X2,v 566:XOR A,X1,v 557:AND A,X2,v 554:AND A,X1,v 543:CP A,X3,v 531:AD A,X3,v 519:ST A,X3,v 507:LD A,X3,v 487:CP X3,X2,v 484:CP X3,X1,v 475:AD X3,X2,v 472:AD X3,X1,v 463:ST X3,X2,v 460:ST X3,X1,v 451:LD X3,X2,v 448:LD X3,X1,v 434:CP X2,X2,v 431:CP X2,X1,v 422:AD X2,X2,v 419:AD X2,X1,v 410:ST X2,X2,v 407:ST X2,X1,v 398:LD X2,X2,v 395:LD X2,X1,v 381:CP X1,X2,v 378:CP X1,X1,v 369:AD X1,X2,v 366:AD X1,X1,v 357:ST X1,X2,v 354:ST X1,X1,v 345:LD X1,X2,v 342:LD X1,X1,v 307:PREP X3,v 68:newspapers 57:"GEC 2050" 1604:Computers 1108:The main 1088:CPR AL,X2 1085:CPR AL,X1 1082:CPR AL,AM 1079:SBR X2,L 1064:SBR X2,AL 1061:SBR X1,AL 1058:SBR AM,X1 1052:ADR X2,AL 1049:ADR X1,AL 1035:LDR X1,AM 1032:LDR X2,X1 1029:LDR X1,X2 1026:LDR C,X2 1020:LDR X3,X2 1017:LDR X2,X3 1014:LDR S,X2 1008:LDR AL,AM 1005:LDR AM,AL 999:LDR X2,AL 996:LDR AL,X1 993:LDR X1,AL 985:SB IP,X2 970:LCP IP,X1 958:XOR IP,X1 946:AND IP,X1 932:CP IP,X2 920:AD IP,X2 908:ST IP,X2 896:LD IP,X2 646:DECS X2,v 643:DECS X1,v 634:CLRS X2,v 631:CLRS X1,v 625:JIL X3,v 593:SB A,X2,v 590:SB A,X1,v 575:LCP A,G,v 563:XOR A,G,v 551:AND A,G,v 540:CP A,X2,v 537:CP A,X1,v 528:AD A,X2,v 525:AD A,X1,v 516:ST A,X2,v 513:ST A,X1,v 504:LD A,X2,v 501:LD A,X1,v 481:CP X3,G,v 469:AD X3,G,v 457:ST X3,G,v 445:LD X3,G,v 428:CP X2,G,v 416:AD X2,G,v 404:ST X2,G,v 392:LD X2,G,v 375:CP X1,G,v 363:AD X1,G,v 351:ST X1,G,v 339:LD X1,G,v 331:OUT X3,v 304:PREP X2,v 301:PREP X1,v 221:Although 168:data link 141:MECS 2050 98:July 2022 1757:Category 1611:GEC 2050 1597:Products 1473:Hotpoint 1226:See also 1193:compiler 1076:SBR X1,L 1073:ADR X2,L 1070:ADR X1,L 1046:ADR S,X1 1023:LDR X2,C 1011:LDR X2,S 982:SB IP,X1 967:LCP P,X2 964:LCP P,X1 955:XOR P,X2 952:XOR P,X1 943:AND P,X2 940:AND P,X1 929:CP IP,X1 917:AD IP,X1 905:ST IP,X1 893:LD IP,X1 640:DECS G,v 628:CLRS G,v 622:JIL X2,v 619:JIL X1,v 613:JI X3,v 587:SB A,G,v 534:CP A,G,v 522:AD A,G,v 510:ST A,G,v 498:LD A,G,v 328:OUT X2,v 325:OUT X1,v 319:IN X3,v 298:PREP G,v 166:, and a 158:reader, 145:GEC 2050 122:GEC 2050 1769:Commons 1266:22 June 1131:Fortran 979:SB P,X2 976:SB P,X1 926:CP P,X2 923:CP P,X1 914:AD P,X2 911:AD P,X1 902:ST P,X2 899:ST P,X1 890:LD P,X2 887:LD P,X1 727:SETL 4 616:JIL G,v 610:JI X2,v 607:JI X1,v 322:OUT G,v 316:IN X2,v 313:IN X1,v 176:turnkey 124:was an 82:scholar 1685:People 1626:OS4000 1583:Telent 1547:Tracor 1457:Birlec 724:SETL 3 721:SETL 2 718:SETL 1 604:JI G,v 310:IN G,v 225:, the 84:  77:  70:  63:  55:  1726:Other 1588:Unify 1464:(BTH) 1388:Osram 863:STSG 851:PERM 809:SNPF 792:JNCA 739:TSTA 715:MULT 126:8-bit 89:JSTOR 75:books 1268:2022 1182:baud 1171:The 860:CLSG 857:TIME 854:PINT 843:HALT 815:SNTF 812:SNXT 806:SNSK 803:SNPI 800:SNCE 789:JNCA 780:JNZ 768:JNN 736:COMA 733:NEGA 709:TERM 706:NOOP 703:SRB 223:CISC 197:(90 120:The 61:news 1163:Run 848:INH 786:JCA 783:JCA 777:JNZ 765:JNN 756:JL 730:CLA 712:DIV 700:SLB 207:I/O 199:lbs 189:of 187:KiB 44:by 1787:: 774:JZ 771:JZ 762:JN 759:JN 753:JL 697:SR 694:SL 282:F 195:kg 162:, 147:. 133:UK 1319:e 1312:t 1305:v 1270:. 1043:F 990:E 937:D 884:C 840:B 797:A 750:J 747:J 744:9 691:8 654:7 601:6 548:5 495:4 442:3 389:2 336:1 287:0 279:E 276:D 273:C 270:B 267:A 264:9 261:8 258:7 255:6 252:5 249:4 246:3 243:2 240:1 237:0 111:) 105:( 100:) 96:( 86:· 79:· 72:· 65:· 38:.

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8-bit
minicomputer
UK
GEC Computers Limited
Remote Job Entry
punched card
line printer
system console
data link
mainframe computer
turnkey
Arsenal Football Club
KiB
magnetic-core memory
kg
lbs
Channel Controller
I/O
GEC 4000 series

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