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Kansas City standard

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by default supports both a 1200 baud variation of the standard with the same bit encoding as Acorn's, and a 2400 baud variant which doubles the audio rate — a "0" bit is one cycle of a 2400 Hz wave and a "1" bit is two cycles of a 4800 Hz wave. Unlike Acorn machines, the MSX uses two
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can read data at up to 3600 baud from an ideal audio source. The Quick CUTS standard proposed by Bob Cottis and Mike Blandford and published in the Amateur Computer Club newsletter also operated at 2400 baud, encoding "0" as a half-cycle of 1200 Hz and "1" as a whole cycle of 2400 Hz. The receiver
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magazine, who was similarly frustrated by punched tapes. In September 1975, the two co-authored an article on the HITS (Hobbyists' Interchange Tape System), using two tones to represent 1s and 0s. Soon after, several manufacturers started using similar approaches, all incompatible.
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microcomputers, which reduced a "0" bit to one cycle of a 1200 Hz sine wave and a "1" bit to two cycles of a 2400 Hz wave. Standard encoding includes a "0" start bit and "1" stop bit around every 8 bit piece of information, giving an effective data rate of 960
458:"1" stop bits in addition to one "0" start bit, so the effective rate at 1200 baud is approximately 873 bits per second, and the effective rate at 2400 baud is approximately 1,745 bits per second. The machine's 209:
According to Solomon, the efforts were unsuccessful: "Unfortunately, it didn't last long; before the month ended, everyone went back to his own tape standard and the recording confusion got worse."
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for program storage, an expensive option. Computer consultant Jerry Ogdin conceived the use of audio tones on a cassette to replace the paper tapes. He took the idea to Les Solomon, editor of
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on thin vinyl that would hold one song, these were inexpensive and could be bound in a magazine. Bill Turner and Bill Blomgren of MicroComputerSystems Inc. along with Bob Jones of
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has a report on the symposium, and the March issue features two hardware examples by Don Lancaster and Harold Mauch. The 300 baud rate is reliable, but slow; a typical 8-kilobyte
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microprocessor. The idea was to record the program on audio tape in the Kansas City format and then make a master record from the tape. Eva-Tone made
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magazine, wanted all the manufacturers to collaborate on a single cassette standard. He organized a two-day meeting on 7–8 November 1975 in
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Hübler, Bernd (1987) . "2.6. Kassetteninterface" [2.6. Cassette interface]. In Erlekampf, Rainer; Mönk, Hans-Joachim (eds.).
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The original standard records data as "marks" (one) and "spaces" (zero). A mark bit consists of eight cycles at a frequency of 2400
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standard for S-100 computers", supported the Kansas City Standard in addition to the Tarbell "native" mode ("Tarbell standard").
961:] (in German) (3 ed.). Berlin: Militärverlag der Deutschen Demokratischen Republik, Leipzig. pp. 92–99, 164–165. 1368: 870:
RPM record containing about six minutes of Kansas City standard audio. The September 1978 Floppy ROM Number 5 has two sides:
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program to be recorded. This test record did not work and Processor Technology was unable to devote more time to the effort.
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Kim-1, MOS Technology Optional S-100 expansion bus (KIMSI), standard 300 bit/s mode and a hypertype 1200 baud variant.
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developed the popular CUTS (Computer Users' Tape Standard), which works at either 300 or 1200 baud. They provided the
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Blomgren, William (May 1977). "Platter BASIC: The Search for a Good, Random Access, Record Cutting Juke Box".
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worked with Eva-Tone and developed a successful process. The intermediate stage of recording to tape produced
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CUTS Tape I/O interface board, which offers both CUTS and Kansas City standard support to any S-100 system.
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KCS originated from the earliest days of the microcomputer revolution, among other prolific protocols. Most
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data on inexpensive consumer quality cassettes. The first systems based on the standard appeared in 1976.
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The SWTPC AC-30 Cassette Interface implements the Kansas City standard. In May 1976, it was sold for
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Acorn System 1 Technical Manual, p.15: "On the keyboard is a Computer Users Tape Standard interface"
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Feichtinger, Herwig (1987). "1.8.3. Kassettenaufzeichnung" [1.8.3. Cassette recording].
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Z80 Starter Kit (1977 — Development board by SD Systems — 300 bauds — S-100 bus)
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Optional S-100 expansion bus, standard 300 bit/s mode and a 1200 baud variant by default.
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program takes five minutes to load. Most audio cassette circuits support higher speeds.
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Heathkit ET/ETW-3400 and 3400A Microprocessor Trainers (300, 1200, 2400 baud)
538: 140: 99: 73: 47: 1647: 382:, and a space bit consists of four cycles at a frequency of 1200 Hz. A 79:
One variation on the basic standard is CUTS, which is identical at 300 
1494: 1283:. Vol. 91, no. 45. New York: Billboard Publications. p. 88. 817: 810:, Bob Marsh of Processor Technology approached Bob Jones, the publisher of 779: 447: 394:
order, which is least significant bit first. 7-bit words are followed by a
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The BBC Microcomputer System. PART II — HARDWARE SPECIFICATION
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Gary Kay (December 1976). "The Designer's Eye View of the AC-30".
1148: 1453: 605: 547:(300 baud CUTS — faster 2400 non-CUTS format also available) 467:. Published in 1978, it predates the 1982 patent for the similar 1559: 1344:. Vol. 1, no. 16. BYTE Publications. pp. 98–108. 652: 563: 525: 324: 170:(AFSK). A "0" bit is represented as four cycles of a 1200  152: 162:
A KCS cassette interface is similar to a modem connected to a
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Turner, William W. (May 1977). "Robert Uiterwyk's 4K BASIC".
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Richard Smith, The Computer Hobbyist, Raleigh, North Carolina
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The participants of the Kansas City symposium include these:
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Jones, Robert S. (May 1977). "The Floppy ROM Experiment".
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R. T. Russell, BBC Engineering Designs Department (1981).
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1, 2 (which also supports a 1200 bit/s variant, see below)
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Processor Tech CUTS S-100 bus Tape I/O interface board
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Paul Tucker, HAL Communications Corp, Urbana, Illinois
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magazine May 1977 issue, with a Kansas City standard
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SWTPC.com's article on the AC-30 cassette interface
1093:"Report: BYTE's Audio Cassette Standards Symposium" 1268: 934:] (in German) (2 ed.). Munich, Germany: 806:In August 1976 at the Personal Computing show in 72:to develop a standard for the storage of digital 1829: 1137:. No. 7. BYTE Publications. pp. 40–45. 1118:. No. 7. BYTE Publications. pp. 30–39. 1099:. No. 6. BYTE Publications. pp. 72–73. 139:. The participants settled on a system based on 1384:Kansas City Tape Decoder (Modern win32 version) 1176:(Report). The British Broadcasting Corporation. 1128: 442:. Also, these machines record data in 256-byte 1374:Percom Data CIS-30 Cassette Interface Brochure 1091:Manfred and Virginia Peschke (February 1976). 1404: 1333: 1109: 752:Casio FX-750P with FA-20 interface (300 baud) 155:) wrote the standard, which was published in 1086: 1084: 755:Casio PB-700 with FA-11 interface (300 baud) 683:Z80NE Nova Elettronica with LX.385 interface 61:. It originated in a symposium sponsored by 959:Micro-electronics for the practical amateur 925: 703: 1411: 1397: 1274: 1070:. No. 1. Green Publishing. p. 22 46:, is a data storage protocol for standard 1329:(6). McPheters, Wolfe & Jones: 29–36. 1310:(6). McPheters, Wolfe & Jones: 40–54. 1081: 1058: 343:George Perrine, HAL Communications Corp, 27: (equivalent to about $ 400 in 2023). 1364:2-second sound sample of stored KCS file 1339: 1320: 975: 790: 18: 1025: 816:magazine, about pressing software onto 661:C1P/Superboard II, C2-4P/C4P, C2-8P/C8P 479: 1830: 1301: 1275:Penchansky, Alan (November 10, 1979). 952: 786: 1392: 1277:"New Building for 'Soundsheets' Firm" 1259: 1031:"BYTE Sponsors ACR Standards Meeting" 1008: 1006: 860:contains the first "Floppy ROM", a 33 699:(1200 baud, 2 stop bits, same as MSX) 667:A slightly different 600 baud variant 557: 425:implemented a 1200-baud variation of 106:that are incompatible with anything. 1205: 1131:"Digital Data on Cassette Recorders" 955:Mikroelektronik in der Amateurpraxis 1019: 820:. Processor Technology provided an 114:Early microcomputers generally use 13: 1359:The original Byte Magazine article 1213:"Amateur Computer Club Newsletter" 1003: 919: 474: 14: 1864: 1352: 315:Southwest Technical Products Corp 773:with TA-1 tape interface module. 761: 550:Eltec (German Company) Eurocom 1 1239: 1230: 984:from the original on 2017-03-14 976:von Cube, Marcus (2015-03-15). 608:Magazine National SC/MP Project 373: 1853:Standards of the United States 1611:"Eighth" (0.15) inch (3.81 mm) 1180: 1165: 1141: 1129:Harold A. Mauch (March 1976). 1122: 1103: 1052: 588:(300 and 1200 baud variations) 390:(8 bits) long, is recorded in 143:'s design. After the meeting, 1: 1624:KC standard, Compact Cassette 996: 749:interface (300 and 1200 baud) 1110:Don Lancaster (March 1976). 830:Southwest Technical Products 782:and other musical equipment. 7: 1848:Tape-based computer storage 877: 484:Several use the S-100 bus. 198:The February 1976 issue of 10: 1869: 1710:Three quarter inch (19 mm) 1636:Tarbell Cassette Interface 1420:Magnetic-tape data storage 909:Tarbell Cassette Interface 463:was self-clocking using a 446:interspersed with gaps of 413:Tarbell Cassette Interface 323:Harold A Mauch, Pronetics/ 109: 1805:Four millimeter (3.81 mm) 1804: 1769: 1734: 1709: 1702: 1663: 1610: 1581: 1552: 1469: 1434: 1427: 928:Arbeitsbuch Mikrocomputer 808:Atlantic City, New Jersey 309:Bellingham, Massachusetts 271:, Albuquerque, New Mexico 264:, Albuquerque, New Mexico 254:, Albuquerque, New Mexico 228:, The Computer Hobbyist, 1379:Kansas City Tape Decoder 1191:. Kuma Computers. 1985. 704:Programmable calculators 159:magazine's first issue. 1770:Eight millimeter (8 mm) 1553:Eight millimeter (8 mm) 978:"CASsette IO Utilities" 932:Microcomputer work book 914:Unified Emulator Format 848:and Bud Schamburger of 686:Chaos Homebrew Computer 307:Joe Frappier, Mikra-D, 243:Albuquerque, New Mexico 230:Raleigh, North Carolina 151:) and Harold Mauch (of 131:, who had just started 1671:Exatron Stringy Floppy 1582:Quarter inch (6.35 mm) 1112:"Build the Bit Boffer" 803: 168:frequency-shift keying 28: 1664:Stringy (1.58–1.9 mm) 794: 545:Tangerine Microtan 65 339:San Ramon, California 137:Kansas City, Missouri 70:Kansas City, Missouri 22: 16:Data storage standard 1843:Early microcomputers 1016:, Digital Deli, 1984 938:. pp. 230–235. 735:interface (300 baud) 721:interface (300 baud) 649:(1200 and 2400 baud) 480:Early microcomputers 469:coded mark inversion 402:Processor Technology 335:Pacific Cyber/Metrix 303:Berkeley, California 299:Processor Technology 283:Berkeley, California 279:Processor Technology 277:, LGC Engineering / 221:Bloomington, Indiana 149:Processor Technology 68:in November 1975 in 33:Kansas City standard 1735:Half inch (12.7 mm) 1689:Rotronics Wafadrive 1642:Commodore Datasette 1470:Half inch (12.7 mm) 936:Franzis-Verlag GmbH 889:Commodore Datasette 787:Alternative formats 771:electronic keyboard 641:(300 and 1200 baud) 622:(300 and 1200 baud) 600:Dick Smith Super-80 569:Acorn Computers Ltd 423:Acorn Computers Ltd 358:Oakland, California 354:Godbout Electronics 352:Michael Stolowitz, 289:Popular Electronics 121:Popular Electronics 1838:Computer standards 1064:"Serial Interface" 1062:(September 1975). 1014:"Solomon's Memory" 804: 558:Personal computers 364:Sphere Corporation 319:San Antonio, Texas 293:New York, New York 195:bytes per second. 29: 1825: 1824: 1821: 1820: 1698: 1697: 1435:Wide (19–25.4 mm) 1029:(December 1975). 904:IBM cassette tape 834:BASIC interpreter 528:Terminal Computer 519:MEK D1 6800 board 465:phase-locked loop 1860: 1707: 1706: 1489:TX-2 Tape System 1432: 1431: 1413: 1406: 1399: 1390: 1389: 1346: 1345: 1337: 1331: 1330: 1318: 1312: 1311: 1299: 1293: 1292: 1272: 1266: 1265: 1257: 1251: 1250: 1243: 1237: 1234: 1228: 1227: 1225: 1223: 1217: 1209: 1203: 1202: 1189:The MSX Red Book 1184: 1178: 1177: 1169: 1163: 1162: 1160: 1159: 1149:"The IMSAI 8800" 1145: 1139: 1138: 1126: 1120: 1119: 1107: 1101: 1100: 1088: 1079: 1078: 1076: 1075: 1056: 1050: 1049: 1047: 1046: 1023: 1017: 1010: 992: 990: 989: 972: 949: 869: 868: 864: 836:program for the 828:and Gary Kay of 698: 678:Alphatronic PC16 634:MicroBee Systems 594:(1200 baud only) 541:-based computers 345:Urbana, Illinois 194: 193: 189: 186: 102:of the era have 60: 26: 1868: 1867: 1863: 1862: 1861: 1859: 1858: 1857: 1828: 1827: 1826: 1817: 1800: 1765: 1730: 1694: 1659: 1654:IBM PC Cassette 1606: 1577: 1548: 1465: 1423: 1417: 1355: 1350: 1349: 1338: 1334: 1319: 1315: 1300: 1296: 1273: 1269: 1258: 1254: 1245: 1244: 1240: 1235: 1231: 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August 1978 1214: 1208: 1200: 1198:0-7457-0178-7 1194: 1190: 1183: 1175: 1168: 1154: 1150: 1144: 1136: 1132: 1125: 1117: 1113: 1106: 1098: 1094: 1087: 1085: 1069: 1065: 1061: 1055: 1041:on 2012-03-23 1040: 1036: 1032: 1028: 1022: 1015: 1012:Les Solomon, 1009: 1007: 1002: 983: 979: 974: 970: 968:3-327-00357-2 964: 960: 956: 951: 947: 945:3-7723-8022-0 941: 937: 933: 929: 924: 923: 915: 912: 910: 907: 905: 902: 900: 897: 895: 892: 890: 887: 885: 882: 881: 875: 873: 859: 858:Interface Age 855: 851: 847: 846:Interface Age 843: 839: 838:Motorola 6800 835: 831: 827: 823: 819: 818:vinyl records 815: 814: 813:Interface Age 809: 801: 797: 796:Interface Age 793: 781: 778: 777:Roland TR-707 775: 772: 769: 766: 765: 762:Other devices 754: 751: 748: 744: 743:Casio FX-850P 740: 739:Casio FX-603P 737: 734: 730: 726: 723: 720: 716: 713: 712: 711: 708: 707: 696: 691: 688: 685: 682: 677: 674: 673: 672: 671:Triumph-Adler 669: 666: 663: 660: 657: 654: 651: 648: 645: 640: 637: 636: 635: 632: 627: 624: 621: 618: 615: 614: 613: 610: 607: 604: 601: 598: 593: 590: 587: 584: 581: 578: 575: 572: 571: 570: 567: 565: 562: 561: 552: 549: 546: 543: 540: 539:Motorola 6800 536: 533: 530: 527: 524: 521: 518: 515: 513: 510: 507: 504: 501: 498: 495: 492: 490: 487: 486: 485: 472: 470: 466: 461: 456: 451: 449: 445: 441: 436: 432: 428: 424: 420: 418: 414: 409: 407: 403: 399: 397: 393: 392:little endian 389: 385: 381: 369: 365: 361: 359: 355: 351: 348: 346: 342: 340: 336: 332: 330: 326: 322: 320: 316: 312: 310: 306: 304: 300: 296: 294: 290: 287:Les Solomon, 286: 284: 280: 276: 273: 270: 266: 263: 259: 256: 253: 249: 246: 244: 240: 237:Tom Durston, 236: 233: 231: 227: 224: 222: 218: 215: 214: 213: 210: 207: 205: 201: 196: 180: 176: 173: 169: 165: 160: 158: 154: 150: 146: 142: 141:Don Lancaster 138: 134: 130: 126: 123: 122: 117: 107: 105: 101: 96: 94: 90: 86: 82: 77: 75: 74:microcomputer 71: 67: 65: 59: 53: 49: 45: 43: 38: 34: 21: 1748:Redwood SD-3 1623: 1341: 1335: 1326: 1322: 1316: 1307: 1303: 1297: 1280: 1270: 1261: 1255: 1241: 1232: 1220:. 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Retrieved 958: 954: 931: 927: 857: 845: 826:Daniel Meyer 811: 805: 795: 780:drum machine 665:Sega SC-3000 503:Lucas Nascom 483: 452: 448:carrier tone 426: 421: 416: 410: 400: 377: 374:Enhancements 333:Bob Nelson, 267:Bob Zaller, 211: 208: 199: 197: 161: 156: 132: 127: 119: 116:punched tape 113: 97: 78: 63: 41: 40: 36: 32: 30: 1566:IBM 3570 MP 1531:LTO Ultrium 1483:IBM 7-track 894:Fast loader 872:Apple BASIC 850:Holiday Inn 842:Soundsheets 768:Casio PT-50 693: [ 626:Zenith Z-89 620:Heathkit H8 512:Altair 8800 362:Mike Wise, 325:Percom Data 297:Bob Marsh, 217:Ray Borrill 164:serial port 129:Wayne Green 1832:Categories 1648:DECtape II 1158:2018-09-24 1074:2018-04-10 1045:2007-05-04 997:References 988:2017-03-14 971:. 7469332. 899:Flexi disc 822:Intel 8080 802:floppy ROM 800:flexi disc 580:Acorn Atom 471:proposal. 396:parity bit 313:Gary Kay, 291:Magazine, 258:Ed Roberts 248:Bill Gates 1289:0006-2510 1281:Billboard 586:BBC Micro 431:BBC Micro 406:S-100 bus 175:sine wave 56:300  54:media at 50:or other 1537:IBM 3592 1513:IBM 3590 1501:IBM 3480 1477:UNISERVO 1448:LINCtape 1442:IBM 7340 982:Archived 884:BASICODE 878:See also 854:dropouts 639:MicroBee 612:Heathkit 517:Motorola 417:de facto 93:BASICODE 87:and the 66:magazine 44:standard 1812:DDS/DAT 1783:Mammoth 1703:Helical 1495:9-track 1460:CDC 626 1454:DECtape 1422:formats 865:⁄ 729:FX-702P 606:Elektor 429:in its 190:⁄ 110:History 39:), or 1814:(1989) 1797:(1999) 1791:(1996) 1785:(1994) 1779:(1987) 1762:(2003) 1756:(19xx) 1750:(1995) 1744:(1992) 1727:(1992) 1723:Ampex 1720:(19xx) 1691:(1984) 1685:(1984) 1679:(1983) 1673:(1979) 1656:(1981) 1650:(1979) 1644:(1977) 1638:(1976) 1632:(1976) 1626:(1975) 1620:(1971) 1603:(1992) 1597:(1986) 1591:(1972) 1574:(1999) 1568:(1997) 1562:(1995) 1560:Travan 1545:(2006) 1543:T10000 1539:(2003) 1533:(2000) 1527:(2000) 1521:(1998) 1515:(1995) 1509:(1984) 1503:(1984) 1497:(1964) 1491:(1958) 1485:(1952) 1479:(1951) 1462:(1966) 1456:(1963) 1450:(1962) 1444:(1961) 1428:Linear 1287:  1195:  965:  942:  690:Irisha 653:Nascom 564:ABC 80 526:Sol-20 444:blocks 153:Percom 25:US$ 80 1777:Data8 1742:ArVid 1716:Sony 1630:DC100 1618:D/CAS 1601:Ditto 1525:T9940 1519:T9840 1216:(PDF) 957:[ 930:[ 745:with 731:with 717:with 710:Casio 697:] 535:SWTPC 204:BASIC 85:Acorn 81:bit/s 1760:SAIT 1342:BYTE 1285:ISSN 1224:2022 1193:ISBN 1135:BYTE 1116:BYTE 1097:BYTE 1068:BYTE 963:ISBN 940:ISBN 747:FA-6 741:and 733:FA-2 727:and 719:FA-1 509:MITS 460:BIOS 453:The 433:and 427:CUTS 411:The 388:byte 384:word 269:MITS 262:MITS 252:MITS 239:MITS 200:Byte 179:baud 157:Byte 147:(of 133:Byte 64:Byte 42:Byte 31:The 1795:VXA 1789:AIT 1754:DTF 1725:DST 1718:DIR 1595:SLR 1589:QIC 1572:ADR 1507:DLT 647:MSX 537:'s 455:MSX 89:MSX 37:KCS 1834:: 1325:. 1306:. 1279:. 1151:. 1133:. 1114:. 1095:. 1083:^ 1066:. 1033:. 1005:^ 980:. 695:ru 398:. 380:Hz 366:, 356:, 337:, 327:, 317:, 301:, 281:, 260:, 250:, 241:, 219:, 192:11 183:27 172:Hz 1412:e 1405:t 1398:v 1327:2 1308:2 1291:. 1249:. 1226:. 1201:. 1161:. 1077:. 1048:. 991:. 948:. 867:3 863:1 188:3 185:+ 35:(

Index


cassette tapes
audio recording
bits per second
Byte magazine
Kansas City, Missouri
microcomputer
bit/s
Acorn
MSX
BASICODE
home computers
unique formats
punched tape
Popular Electronics
Wayne Green
Kansas City, Missouri
Don Lancaster
Lee Felsenstein
Processor Technology
Percom
serial port
frequency-shift keying
Hz
sine wave
baud
BASIC
Ray Borrill
Bloomington, Indiana
Hal Chamberlin

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