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Kermit (protocol)

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1459: 441:. The term "SuperKermit" was coined by third-party vendors to refer to higher speed Kermit implementations offering features such as full duplex operation, sliding windows, and long packets; however, that term was deprecated by the original Kermit team at Columbia University, who saw these as simply features of the core Kermit protocol. 249:
cable, or failing that, a very simple version of the Kermit protocol can be hand coded in binary in less than 2K using DDT, the CP/M Dynamic Debugging Tool. Once done, the simple version of Kermit can be used to download a fully functional version. That version can then be used to transfer any CP/M
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As of version 9.0 (starting with the first Beta test), C-Kermit has an Open Source license, the Revised 3-Clause BSD License. Everybody can use it as they wish for any purpose, including redistribution and resale. It may be included with any operating system where it works or can be made to work,
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Kermit is for everyone to use and share. Once you get it, feel free to pass it along to your friends and colleagues. Although it is copyrighted and not in the public domain, we only ask that you not attempt to sell it for profit, and that you use it only for peaceful and humane
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formats, which means that one machine often cannot read disks from another CP/M machine, and Kermit is used as part of a process to transfer applications and data between CP/M machines and other machines with different operating systems. The CP/M file-copy program
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became especially popular. In 1986 the university founded the Kermit Project, which took over development and started charging fees for commercial use; the project was financially self-sufficient. For non-commercial use, Columbia University stated that
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and microcomputer systems down to handhelds and electronic pocket calculators. Most versions had a user interface based on the original TOPS-20 Kermit. Later versions of some Kermit implementations also support network as well as
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is used with selective retransmission which provides excellent performance and error recovery characteristics. On 7-bit connections, locking shifts provide efficient transfer of 8-bit data. When properly implemented, as in the
427: 335:, so conversion between the two character sets was one of the early functions built into Kermit. The first file transfer with Kermit occurred in April 1981. The protocol was originally designed in 1981 by 433:
As well as the implementations developed and/or distributed by Columbia University, the Kermit protocol was implemented in a number of third-party communications software packages, among others
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cannot be transmitted, Kermit can be configured to work, unlike protocols like XMODEM that require the connection to be transparent (i.e. all 256 possible values of a byte to be transferable).
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including both free and commercial versions of Unix and Hewlett-Packard (formerly DEC) VMS (OpenVMS). Technical support will be available from Columbia University only through 30 June 2011.
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Columbia University coordinated development of versions of Kermit for many different computers at the university and elsewhere, and distributed the software for free; Kermit for the new
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Kermit is an open protocol—anybody can base their own program on it, but some Kermit software and source code is copyright by Columbia University. The final license page said:
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connections in a system- and medium-independent fashion, and is implemented on hundreds of different computer and operating system platforms. On full-duplex connections, a
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and a set of communications software tools primarily used in the early years of personal computing in the 1980s. It provides a consistent approach to file transfer,
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rate (because it has no built-in error correction) can be used to transfer a small, simple version of Kermit from one machine to another over a
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data communications standard for transferring files between dissimilar computer systems, and by the early 1990s it could convert multilingual
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had only 35 kilobytes of storage per person. Kermit was developed at the university so students could move files between them and
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Kermit Software collection, its authors claim performance is equal to or better than other protocols such as
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Some of the sentences in the Technical section are based on text copied, on 30 October 2004, from the
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By 1988 Kermit was available on more than 300 computers and operating systems. The protocol became a
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Dictionary of Computer and Internet Words: An A to Z Guide to Hardware, Software, and Cyberspace
1600: 1514: 1432: 1421: 1406: 95: 27: 1275:"Kermit - What is it?" The Kermit Project. 26 October 2006. Columbia University. 11 July 2007 1146: 1091: 1066: 803: 776: 347: 642: 8: 320: 144: 1458: 1373: 365: 297: 254: 206: 202: 103: 426:. In June 2011, the Kermit Project released a beta version of C-Kermit v9.0 under the 422:
As of 1 July 2011, Columbia University ceased to host this project and released it as
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EXEC-inspired command language and was influenced syntactically and semantically by
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The Informatics Handbook: A guide to multimedia communications and broadcasting
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on their personal computers that downloads Kermit and converts it into binary.
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The correctness of the Kermit protocol has been verified with formal methods.
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The preceding sentence is based on text copied, on 30 October 2004, from the
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and automation of commands. The Kermit scripting language evolved from its
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See "Figure 1-1: Bootstrap program for Kermit-80 and CP/M Version 2.2"
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installed can connect to otherwise incompatible systems such as a
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other software, even itself. To distribute Kermit through non
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transfers on both full-duplex and half-duplex 8-bit and 7-bit
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Telecommunications Using ProComm & ProComm Plus Made Easy
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was nevertheless created, perhaps to avoid trademark issues,
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Christopher J. Rawlings; S. Rawlings (11 November 1986).
309: 808:. Macmillan International Higher Education. p. 20. 681:. New York: Oxford University Press. pp. 247–293. 1164: 1151:, Springer Science & Business Media, p. 372, 1120: 1032: 159:, especially on poor connections. On connections over 657:"C-Kermit / Kermit 95 Scripting Tutorial and Library" 643:"C-Kermit / Kermit 95 Scripting Tutorial and Library" 388:
Implementations that are presently supported include
912:. Columbia University's Kermit Project. 21 June 2011 795: 1219: 864:(Mailing list). Kermit Project, Columbia University 837:(Mailing list). Kermit Project, Columbia University 596:(Mailing list). Kermit Project, Columbia University 569:(Mailing list). Kermit Project, Columbia University 1372: 1058: 296:In the late 1970s, users of Columbia University's 1507: 1114: 956:Walter R. Bruce; Alan C. Elliott (1 April 1991). 1592: 1213: 1194: 1026: 949: 829:Doupnik, Joe; da Cruz, Frank (11 January 1988). 588:Fuller, Bill; da Cruz, Frank (11 October 1989). 419:), but other versions remain available as well. 376:. It was ported to a wide variety of mainframe, 822: 762:International Space Station Incorporates Kermit 1223:Power DOS!: learn to run your PC like a master 930: 855: 849: 560: 469:version was a depiction of Kermit the Frog. A 1493: 1308:"Kermit Software: Frequently Asked Questions" 980: 729:da Cruz, Frank; Catchings, Bill (July 1984). 702:da Cruz, Frank; Catchings, Bill (June 1984). 581: 554: 331:character set and CP/M and DEC machines used 1083: 778:The Windows Serial Port Programming Handbook 722: 241:) port, and if configured to use a very low 1439:(Interview). Interviewed by Alex Bochannek. 1173:Technology edge: a guide to field computing 1171:Dana Blankenhorn; Kimberly Maxwell (1992), 1065:. Houghton Mifflin Harcourt. 2001. p.  695: 1500: 1486: 1457: 1277:http://www.columbia.edu/kermit/kermit.html 1226:. Random House Information Group. p.  1188: 1005: 974: 924: 563:"Re: Printable Encodings for Binary Files" 1144: 1090:Johnston, Christopher (28 October 1986). 1138: 1089: 999: 805:Software Directory for Molecular Biology 774: 672:"Kermit: specification and verification" 617:"CP/M-80 KERMIT VERSION 4.11 USER GUIDE" 237:can usually access a computer's serial ( 1430: 1370: 768: 669: 614: 444: 1593: 1175:, New Riders Publishing, p. 286, 1009:ProComm plus 2 for Windows for dummies 756: 754: 752: 213:Kermit in .boo format. Users can then 1582:Comparison of file transfer protocols 1481: 1220:Alfred Glossbrenner (31 March 1993). 1330:Free On-line Dictionary of Computing 1125:, Osborne McGraw-Hill, p. 235, 1123:Dr. File Finder's Guide to Shareware 1037:. Osborne McGraw-Hill. p. 386. 1035:Dr. File Finder's Guide to Shareware 885:"Standards: Do We Really Need Them?" 882: 876: 679:Specification and validation methods 545:Free On-line Dictionary of Computing 1464: 1419: 1252:"Kermit FAQ - What Is SuperKermit?" 1195:Philip L. Becker (September 1991). 749: 13: 1364: 1290:"Superbrain Video Computer System" 253:Newer versions of Kermit included 14: 1637: 1444: 1197:Introduction to PC communications 1121:Mike Callahan; Nick Anis (1990), 1033:Mike Callahan; Nick Anis (1990). 935:. Prentice Hall. pp. 30–31. 931:Michele Woggon (1 January 1995). 173:Kermit can be used as a means to 110:conversion across many different 1375:Kermit: A File Transfer Protocol 883:Good, Robin (23 December 2003). 561:da Cruz, Frank (20 March 1986). 1339: 1322: 1300: 1282: 1269: 1244: 1051: 902: 856:da Cruz, Frank (29 July 1988). 831:"Announcing MS-DOS Kermit 2.30" 1332:, which is licensed under the 960:. Que Corp. pp. 139–143. 663: 649: 635: 624: 608: 547:, which is licensed under the 537: 1: 1431:Doupnik, Joe (13 July 2012). 1145:S.A. Fist (6 December 2012), 1102:(18). Ziff Davis, Inc.: 132. 775:Ying Bai (19 November 2004). 615:Gianone, C. (23 April 1991). 530: 126:The Kermit protocol supports 1423:Frank da Cruz Kermit records 428:Revised 3-Clause BSD License 228:machines use many different 181:networks Columbia developed 121: 7: 1606:BBS file transfer protocols 1433:"Doupnik, Joe oral history" 513: 374:International Space Station 57:; 43 years ago 10: 1642: 1426:. Computer History Museum. 1012:. IDG Books. p. 127. 670:Huggins, James K. (1995). 291: 1579: 1521: 1467:"Kermit Software Archive" 1408:Kermit oral history panel 781:. CRC Press. p. 65. 677:. In Börger, Egon (ed.). 327:. IBM mainframes used an 69: 51: 43: 33: 26: 983:ProComm Plus 2.0 at Work 910:"C-Kermit 9.0 Beta Test" 164:Statistical Multiplexers 94:transfer and management 1616:File transfer protocols 1437:Computer History Museum 1413:Computer History Museum 1371:da Cruz, Frank (1987). 457:, with permission from 449:Kermit was named after 308:around campus, such as 215:type in a "baby Kermit" 187:binary-to-text encoding 140:sliding window protocol 1611:Communication software 1471:Columbia University IT 981:Joanne Krause (1991). 631:columbia.edu Kermit 95 590:"Kermit Bootstrapping" 511: 358: 28:Communication protocol 16:File transfer protocol 506: 353: 348:IBM Personal Computer 250:application or data. 445:Naming and copyright 372:problems aboard the 321:Intertec Superbrains 1626:Columbia University 1350:Columbia University 1312:Columbia University 1294:www.staff.ncl.ac.uk 1199:. Que. p. 69. 1006:Wally Wang (1994). 366:character encodings 298:mainframe computers 145:Columbia University 47:Columbia University 23: 1621:Terminal emulators 958:Using Procomm Plus 889:masternewmedia.org 862:Info-Kermit Digest 835:Info-Kermit Digest 594:Info-Kermit Digest 567:Info-Kermit Digest 255:scripting language 207:mainframe computer 203:Compatibility Card 195:IBM PC compatibles 189:system similar to 168:control characters 100:terminal emulation 21: 1588: 1587: 1356:on 16 March 2023. 1237:978-0-679-73924-1 1206:978-0-88022-747-6 1182:978-1-56205-091-7 1158:978-1-4615-2093-1 1132:978-0-07-881646-8 1044:978-0-07-881646-8 992:978-0-201-57789-1 967:978-0-88022-704-9 942:978-0-13-148412-2 815:978-1-349-08234-6 788:978-0-203-34196-4 459:Henson Associates 409:Microsoft Windows 407:(for versions of 112:computer hardware 106:programming, and 85: 84: 1633: 1502: 1495: 1488: 1479: 1478: 1474: 1465:da Cruz, Frank. 1461: 1456: 1455: 1453:Official website 1440: 1427: 1420:da Cruz, Frank. 1416: 1402: 1378: 1358: 1357: 1352:. Archived from 1343: 1337: 1326: 1320: 1319: 1314:. Archived from 1304: 1298: 1297: 1286: 1280: 1273: 1267: 1266: 1264: 1262: 1256:www.columbia.edu 1248: 1242: 1241: 1217: 1211: 1210: 1192: 1186: 1185: 1168: 1162: 1161: 1142: 1136: 1135: 1118: 1112: 1111: 1087: 1081: 1080: 1064: 1055: 1049: 1048: 1030: 1024: 1023: 1003: 997: 996: 978: 972: 971: 953: 947: 946: 928: 922: 921: 919: 917: 906: 900: 899: 897: 895: 880: 874: 873: 871: 869: 858:"Kermits Needed" 853: 847: 846: 844: 842: 826: 820: 819: 799: 793: 792: 772: 766: 758: 747: 746: 744: 742: 726: 720: 719: 717: 715: 699: 693: 692: 676: 667: 661: 660: 653: 647: 646: 639: 633: 628: 622: 620: 612: 606: 605: 603: 601: 585: 579: 578: 576: 574: 558: 552: 541: 525:BLAST (protocol) 497:nterchange over 461:. The program's 193:. For instance, 116:operating system 81: 78: 76: 65: 63: 58: 24: 20: 1641: 1640: 1636: 1635: 1634: 1632: 1631: 1630: 1591: 1590: 1589: 1584: 1575: 1517: 1506: 1451: 1450: 1447: 1415:. 6 April 2012. 1405: 1391: 1367: 1365:Further reading 1362: 1361: 1345: 1344: 1340: 1327: 1323: 1318:on 23 May 2023. 1306: 1305: 1301: 1288: 1287: 1283: 1274: 1270: 1260: 1258: 1250: 1249: 1245: 1238: 1218: 1214: 1207: 1193: 1189: 1183: 1169: 1165: 1159: 1143: 1139: 1133: 1119: 1115: 1088: 1084: 1077: 1057: 1056: 1052: 1045: 1031: 1027: 1020: 1004: 1000: 993: 979: 975: 968: 954: 950: 943: 929: 925: 915: 913: 908: 907: 903: 893: 891: 881: 877: 867: 865: 854: 850: 840: 838: 827: 823: 816: 800: 796: 789: 773: 769: 765:(December 2003) 759: 750: 740: 738: 727: 723: 713: 711: 700: 696: 689: 674: 668: 664: 655: 654: 650: 641: 640: 636: 629: 625: 613: 609: 599: 597: 586: 582: 572: 570: 559: 555: 542: 538: 533: 516: 467:Apple Macintosh 451:Kermit the Frog 447: 319:mainframes and 294: 199:Apple computers 124: 73: 61: 59: 56: 17: 12: 11: 5: 1639: 1629: 1628: 1623: 1618: 1613: 1608: 1603: 1586: 1585: 1580: 1577: 1576: 1574: 1573: 1568: 1563: 1558: 1553: 1548: 1543: 1538: 1533: 1528: 1522: 1519: 1518: 1505: 1504: 1497: 1490: 1482: 1476: 1475: 1462: 1446: 1445:External links 1443: 1442: 1441: 1428: 1417: 1403: 1389: 1366: 1363: 1360: 1359: 1338: 1321: 1299: 1281: 1268: 1243: 1236: 1212: 1205: 1187: 1181: 1163: 1157: 1137: 1131: 1113: 1082: 1075: 1050: 1043: 1025: 1018: 998: 991: 973: 966: 948: 941: 923: 901: 875: 848: 821: 814: 794: 787: 767: 748: 721: 694: 687: 662: 648: 634: 623: 607: 580: 553: 535: 534: 532: 529: 528: 527: 522: 515: 512: 493:icroprocessor 446: 443: 341:Bill Catchings 306:microcomputers 293: 290: 123: 120: 83: 82: 77:.kermitproject 71: 67: 66: 53: 49: 48: 45: 41: 40: 35: 31: 30: 15: 9: 6: 4: 3: 2: 1638: 1627: 1624: 1622: 1619: 1617: 1614: 1612: 1609: 1607: 1604: 1602: 1601:1981 software 1599: 1598: 1596: 1583: 1578: 1572: 1569: 1567: 1564: 1562: 1559: 1557: 1554: 1552: 1549: 1547: 1544: 1542: 1539: 1537: 1534: 1532: 1529: 1527: 1524: 1523: 1520: 1516: 1513: 1512:file transfer 1510: 1503: 1498: 1496: 1491: 1489: 1484: 1483: 1480: 1472: 1468: 1463: 1460: 1454: 1449: 1448: 1438: 1434: 1429: 1425: 1424: 1418: 1414: 1410: 1409: 1404: 1400: 1396: 1392: 1390:0-932376-88-6 1386: 1382: 1381:Digital Press 1377: 1376: 1369: 1368: 1355: 1351: 1348: 1342: 1335: 1331: 1325: 1317: 1313: 1309: 1303: 1295: 1291: 1285: 1278: 1272: 1257: 1253: 1247: 1239: 1233: 1229: 1225: 1224: 1216: 1208: 1202: 1198: 1191: 1184: 1178: 1174: 1167: 1160: 1154: 1150: 1149: 1141: 1134: 1128: 1124: 1117: 1109: 1105: 1101: 1097: 1093: 1086: 1078: 1076:0-618-10137-3 1072: 1068: 1063: 1062: 1054: 1046: 1040: 1036: 1029: 1021: 1019:9781568842196 1015: 1011: 1010: 1002: 994: 988: 984: 977: 969: 963: 959: 952: 944: 938: 934: 927: 911: 905: 890: 886: 879: 863: 859: 852: 836: 832: 825: 817: 811: 807: 806: 798: 790: 784: 780: 779: 771: 764: 763: 757: 755: 753: 737:. p. 141 736: 732: 725: 710:. p. 251 709: 705: 698: 690: 688:0-19-853854-5 684: 680: 673: 666: 658: 652: 644: 638: 632: 627: 618: 611: 595: 591: 584: 568: 564: 557: 550: 546: 540: 536: 526: 523: 521: 518: 517: 510: 505: 502: 500: 496: 492: 488: 484: 481: 480: 478: 472: 468: 464: 460: 456: 452: 442: 440: 436: 431: 429: 425: 420: 418: 414: 410: 406: 402: 398: 394: 392: 386: 385:connections. 384: 379: 375: 371: 370:compatibility 367: 363: 357: 352: 349: 344: 342: 338: 337:Frank da Cruz 334: 330: 326: 322: 318: 315: 311: 307: 303: 299: 289: 286: 284: 280: 276: 272: 268: 264: 260: 256: 251: 248: 244: 240: 236: 231: 227: 222: 220: 216: 212: 208: 204: 200: 196: 192: 188: 184: 180: 176: 171: 169: 165: 162: 158: 154: 150: 146: 141: 137: 133: 129: 119: 117: 113: 109: 108:character set 105: 101: 97: 93: 92:computer file 89: 80: 72: 68: 54: 50: 46: 42: 39: 38:File transfer 36: 32: 29: 25: 19: 1550: 1470: 1436: 1422: 1407: 1374: 1354:the original 1349: 1341: 1324: 1316:the original 1311: 1302: 1293: 1284: 1271: 1259:. 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Bedford: 1096:PC Magazine 455:The Muppets 424:open source 304:at various 230:floppy disk 224:Similarly, 209:to receive 179:8-bit clean 166:where some 132:binary file 118:platforms. 1595:Categories 1536:B protocol 741:23 October 714:23 October 531:References 501:TY lines. 489:eciprocal 485:rror-Free 413:Windows 95 247:null modem 1515:protocols 1399:751527576 1261:16 August 1108:0888-8507 520:IND$ FILE 471:backronym 405:Kermit 95 356:purposes. 175:bootstrap 122:Technical 1092:"Kermit" 894:27 April 514:See also 362:de facto 323:running 271:BLISS-10 263:ALGOL 60 96:protocol 1541:HS/Link 1526:BiModem 916:22 June 868:3 March 841:3 March 600:5 March 573:1 March 465:in the 435:ProComm 401:OpenVMS 393:-Kermit 292:History 259:TOPS-20 201:with a 70:Website 60: ( 34:Purpose 1571:ZMODEM 1566:YMODEM 1561:XMODEM 1556:SMODEM 1551:Kermit 1546:JMODEM 1397:  1387:  1234:  1203:  1179:  1155:  1129:  1106:  1073:  1041:  1016:  989:  964:  939:  812:  785:  685:  403:) and 383:serial 329:EBCDIC 281:, and 279:SNOBOL 239:RS-232 211:MS-DOS 191:BinHex 161:RS-232 157:XMODEM 155:, and 153:YMODEM 149:ZMODEM 136:serial 104:script 88:Kermit 22:Kermit 1531:BLAST 1509:Modem 675:(PDF) 453:from 411:from 395:(for 333:ASCII 219:BASIC 90:is a 1395:OCLC 1385:ISBN 1334:GFDL 1263:2019 1232:ISBN 1201:ISBN 1177:ISBN 1153:ISBN 1127:ISBN 1104:ISSN 1071:ISBN 1039:ISBN 1014:ISBN 987:ISBN 962:ISBN 937:ISBN 918:2011 896:2009 870:2016 843:2016 810:ISBN 783:ISBN 743:2013 735:BYTE 716:2013 708:BYTE 683:ISBN 602:2016 575:2016 549:GFDL 463:icon 437:and 417:OS/2 399:and 397:Unix 339:and 325:CP/M 283:LISP 275:PL/I 243:baud 226:CP/M 197:and 185:, a 183:.boo 130:and 128:text 114:and 79:.org 62:1981 55:1981 1228:368 1067:150 479:L10 314:DEC 312:or 310:IBM 235:PIP 217:in 75:www 1597:: 1469:. 1435:. 1411:. 1393:. 1383:. 1310:. 1292:. 1254:. 1230:. 1098:. 1094:. 1069:. 887:. 860:. 833:. 751:^ 733:. 706:. 592:. 565:. 430:. 343:. 285:. 277:, 273:, 269:, 265:, 151:, 102:, 1501:e 1494:t 1487:v 1473:. 1401:. 1336:. 1296:. 1279:. 1265:. 1240:. 1209:. 1110:. 1100:5 1079:. 1047:. 1022:. 995:. 970:. 945:. 920:. 898:. 872:. 845:. 818:. 791:. 745:. 718:. 691:. 659:. 645:. 604:. 577:. 551:. 499:T 495:I 491:M 487:R 483:E 477:K 391:C 267:C 64:)

Index

Communication protocol
File transfer
www.kermitproject.org
computer file
protocol
terminal emulation
script
character set
computer hardware
operating system
text
binary file
serial
sliding window protocol
Columbia University
ZMODEM
YMODEM
XMODEM
RS-232
Statistical Multiplexers
control characters
bootstrap
8-bit clean
binary-to-text encoding
BinHex
IBM PC compatibles
Apple computers
Compatibility Card
mainframe computer
MS-DOS

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