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M1540A cassette drive, built into the earliest models of PET in 1977. This was a standard shoebox tape recorder with a corner of the case removed and modified electronics; a
Commodore PCB was installed internally in place of the Sanyo electronics. To disguise the Sanyo brand, Commodore simply fitted
220:
software appeared, providing much faster loading and saving. Such software was integrated into most commercial prerecorded applications (mostly games), as well as being available separately for loading and saving the users' homemade programs and data. These programs were only widely used in Europe,
626:
in the UK were on cassette. In the United States disk drives quickly became standard, despite the 1541 costing roughly five times as much as a
Datasette. In most parts of Europe, the Datasette was the medium of choice for several years after its launch, although floppy disk drives were generally
342:
from positive to negative voltage of the analog signal is measured. The resulting time between these positive to negative crossings is then compared to a threshold to determine whether the time since the last crossing is short (0) or long (1). Note the lower amplitude for the shorter periods.
265:, motor, read, write, key-sense. The sense signal monitors the play, rewind, and fast-forward buttons but cannot differentiate between them. A mechanical interlock prevents any two of them from being pressed at the same time. The motor power is derived from the computer's unregulated
521:
The first two external models were made as PET peripherals, and styled after the PET 2001 built-in tape drive. The latter two were styled and marketed for the VIC-20 and C64. All 1530s are compatible with all those computers, as well as the
207:(1531). The absence of recordable audio signals on this interface makes the Datasette and clones the only cassette recorders usable with Commodore computers, until aftermarket converters made the use of ordinary recorders possible.
437:
and are continuously compared to a special bit sequence. This bit sequence can also be seen as a byte. A bit-sequence match means that the stream is byte-synchronized. The first byte to compare with is called the
498:
The second built-in
Datassette in the PET 2001: another standard consumer model (sold in some markets as CCE CCT1020) modified with a Commodore PCB. Black cassette lid, five white keys, no tape counter, no SAVE
358:. This event can be handled by a handler code, or simply discovered by testing bit 4 of location $ DC0D. The points that trigger this event are indicated by the black circles in the figure.
315:
604:, which imported American computer games to Britain, often had to wait until they were converted from disk because most British Commodore 64 owners used tape, while the US magazine
313:
616:
reported in 1986 that
British cassette-based software had failed in the United States because "97% of the Commodore systems in the USA have disk drives"; by contrast,
373:-filtered. Op-amp (2) amplifies and feeds an RC filter. Op-amp (3) amplifies the signal again followed by another DC filter. Op-amp (4) amplifies the signal into
314:
1236:
627:
available. The inexpensive and widely available audio cassettes made the
Datasette a good choice for the budget-aware home computer mass market.
210:
Because of its digital format the
Datasette is both more reliable than other data cassette systems and very slow, transferring data at around
191:; if an error is detected when reading the first recording, the computer corrects it with data from the second. The Datasette has built-in
1091:
1015:
579:
in place of the PCB edge connector. This can be used with a C64/128 via an adaptor, which was supplied by
Commodore with some units.
1229:
1208:
529:
In addition to this, some models came with a small hole above the keys, to allow access to the adjustment screw of the tape head
346:
A circuit in the tape unit transforms the analog signal into a logical 1 or 0, which is then transmitted to the computer via the
1198:
1034:
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to convert the computer's digital data into analog audio and vice versa. Connection to the computer is done via a proprietary
160:
systems, and allows them to be used with any cassette player with suitable connections, but using analog tones—similar to how
1683:
993:
555:
Like
Datasette models, the recording format is compatible across computers; the VIC, for example, can read PET cassettes.
1222:
1174:
517:
As above but with black pattern and silvery
Commodore logo, six black keys, tape counter and a red SAVE LED on right side
944:
1668:
768:
1069:
865:
855:
780:
347:
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Black/charcoal body new shape model, silver cassette lid, six light gray keys, with tape counter and a red SAVE LED
811:
514:
White body new-shape model, silver cassette lid, six black keys, with tape counter and a red SAVE LED on the right
386:
188:
511:
White body new-shape model, silver cassette lid, six black keys, with white tape counter SAVE LED on left side
1145:
1118:
1663:
1061:
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354:(6526) in the C64 senses when the signal goes from one to zero. This event is called trigger and causes an
251:
192:
1184:
457:$ 09 (binary 00001001) and a following sync sequence of $ 08, $ 07, $ 06, $ 05, $ 04, $ 03, $ 02, $ 01.
1461:
1397:
1245:
1192:
to build a hardware adaptor/software program to archive
Commodore Datasette files to a modern computer.
656:
610:
reported that by 1983 "90 percent of new Commodore 64 owners bought a disk drive with their computer".
73:
931:
714:
1614:
1585:
1420:
17:
796:
508:
White body original-shape model, black cassette lid, five black keys, with tape counter, no SAVE LED
128:
The Datasette is probably the most sophisticated tape-storage method of any microcomputer. Typical
505:
Black body original-shape model, black cassette lid, five black keys, no tape counter, no SAVE LED
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1550:
1368:
1350:
1344:
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can thus easily be used to affect the adjustment without disassembling the Datassette's chassis.
145:
69:
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688:
246:
The Datasette has only one connection cable, with a 0.156-inch (4.0 mm)–spacing PCB
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366:
153:
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at the computer end. All input/output signals to the Datasette are all digital, and so all
8:
1579:
1514:
1391:
1332:
842:
530:
381:-formed signal. The positive and negative rails for all op-amps are wired to +5V DC and
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254:, and vice versa, is handled within the unit. Power is also included in this cable. The
576:
351:
306:
204:
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1214:
861:
819:
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730:
722:
646:
355:
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In the Datasette, instead of writing two tones to tape to indicate bits, patterns of
30:
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1314:
860:. West Chester: Commodore Business Machines. 1984. Commodore 64 Schematic Diagram.
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572:
120:
109:
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tones. The interface connects to the cassette deck using normal audio cables like
77:
1678:
1326:
1202:
1011:
922:
Datasette service manual model C2N/1530/1531, preliminary, Oct. 1984 PN-314002-02
721:. Vol. 2, no. 1. International Apple Core. Spring 1981. p. 57-58.
390:
434:
370:
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interfaces of the late 1970s use a small controller in the computer to convert
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The Datasette was more popular outside than inside the United States.
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http://www.zimmers.net/anonftp/pub/cbm/faq/trivia/cbm-trivia-13.txt
592:
227:
149:
752:
Friedman, Herb (February 1983). "The Five Friendliest Computers".
540:
Confusingly, the Datassette at various times was sold both as the
473:
1279:
486:
There are at least four main models of the 1530/C2N Datassette:
465:
1385:
285:
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93:
1602:
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1455:
1443:
1185:
Description of tape format with conversion utilities and code
563:
Similar in physical appearance to the 1530/C2N models is the
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85:
214:
per second. After the Datasette's launch, however, special
60:
1620:
773:
The Official Book for the Commodore 128 Personal Computer
469:
The C2N Cassette Unit, the original Datasette model shape
397:
34:
The third, most common version of the 1530 C2N Datassette
769:"Peripherals: Displays, Disk Drives, Printers, and More"
239:
and other fast loaders increased this number to roughly
1244:
767:
Waite, Mitchell; Lafore, Robert; Volpe, Jerry (1985).
686:
682:
680:
678:
676:
674:
672:
552:
versus two) used on the original product packaging.
393:step that in turn feeds the digital cassette port.
1146:"Titans of the Computer Gaming World / MicroProse"
903:
901:
899:
897:
620:reported in 1987 that 80% of its 100,000 sales of
433:Once the bits can be decoded, they are fed into a
221:as the US market had long since moved onto disks.
1004:
669:
84:, it provides inexpensive storage to Commodore's
1655:
890:. Indianapolis: Howard W. Sams. 1984. p. 2.
1211:Sketchup model of the Commodore Datasette 1530.
1209:Sketchup model of the Commodore Datasette 1530.
1143:
1032:
985:
894:
1083:
1059:
1053:
1026:
1016:"Advice to PET Owners: How To Be A VIC Expert"
888:SAMS Computerfacts CC4: Computer: Commodore 64
1230:
1089:
916:
596:One of the few clones, a Phonemark model 4403
385:. The clipped signal therefore fits into the
1137:
1110:
400:version of the C64, the time granularity is
1116:
1010:
818:. New York: Ion International. p. 32.
775:. Howard W. Sams & Co. pp. 11–32.
27:Dedicated magnetic tape data storage device
1237:
1223:
321:Commodore Datasette 18-second sound sample
991:
857:Commodore 64 Programmer's Reference Guide
495:a Commodore badge over the original logo.
187:. Programs are written twice to tape for
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751:
591:
472:
464:
289:The resulting waveform from storing data
284:
276:
170:
119:
29:
687:De Ceukelaire, Harrie (February 1985).
548:. Note the difference in spelling (one
481:
168:instead of successful loading of data.
148:. Such a system is compatible with the
14:
1656:
809:
760:
1218:
942:
812:"Rupert Report: Computers in Control"
558:
224:Datasettes can typically store about
124:The connection cable to the Datasette
994:"The Commodore VIC-20: A First Look"
442:. If matched, it's compared to the
24:
992:Thornburg, David D. (April 1981).
943:Abril, Editora (26 October 1973).
295:
25:
1695:
1168:
1144:Brooks, M. Evan (November 1987).
715:"The Apple II Cassette Interface"
350:. Inside the computer, the first
269:supply via a transistor circuit.
1205:Digital C2N replacement project.
843:pinouts.ru - C64 Cassette pinout
449:An example: Turbo Tape 64 has a
329:Problems playing this file? See
311:
1060:Pountain, Dick (January 1985).
959:
936:
925:
389:electrical level window of the
1437:"Eighth" (0.15) inch (3.81 mm)
913:091205 wav-prg.sourceforge.net
880:
848:
836:
803:
789:
745:
707:
546:1530 DATASSETTE UNIT Model C2N
100:. A physically similar model,
13:
1:
1450:KC standard, Compact Cassette
1175:Similar Commodore tape drives
1033:Anderson, Chris (June 1985).
797:"Basic Commodore information"
662:
587:
575:series computers. This has a
542:C2N DATASETTE UNIT Model 1530
338:To record physical data, the
175:The Datasette loading process
252:digital-to-analog conversion
193:analog-to-digital converters
7:
1684:Tape-based computer storage
1117:Wagner, Roy (August 1986).
1041:(interview). pp. 46–48
1035:"On top of the US Goldmine"
630:
369:(1) whose output signal is
361:Inside the tape device the
272:
115:
10:
1700:
1536:Three quarter inch (19 mm)
1462:Tarbell Cassette Interface
1246:Magnetic-tape data storage
1090:Halfhill, Tom (Dec 1983).
1022:. No. 11. p. 34.
909:"How Commodore tapes work"
810:Rupert, Dale (July 1987).
657:Magnetic-tape data storage
74:magnetic-tape data storage
1669:Home computer peripherals
1631:Four millimeter (3.81 mm)
1630:
1595:
1560:
1535:
1528:
1489:
1436:
1407:
1378:
1295:
1260:
1253:
955:– via Google Books.
460:
352:Complex Interface Adapter
88:computers, including the
453:$ 02 (binary 00000010),
1596:Eight millimeter (8 mm)
1379:Eight millimeter (8 mm)
411:). Since each bit uses
1497:Exatron Stringy Floppy
1408:Quarter inch (6.35 mm)
1098:(editorial). p. 6
968:"Commodore Datasettes"
597:
490:The original modified
478:
470:
365:signal is fed into an
307:Datasette sound sample
300:
290:
282:
183:are used, including a
176:
164:work—often results in
125:
35:
1490:Stringy (1.58–1.9 mm)
1150:Computer Gaming World
1123:Computer Gaming World
1062:"The Amstrad CPC 464"
689:"How TurboTape Works"
637:Famicom Data Recorder
613:Computer Gaming World
595:
476:
468:
367:operational amplifier
299:
288:
280:
174:
154:TRS-80 Color Computer
123:
33:
1092:"The Editor's Notes"
652:Kansas City standard
482:PET, VIC-20, C64/128
281:Inside the Datasette
203:(Commodore 1530) or
1664:CBM storage devices
1561:Half inch (12.7 mm)
1515:Rotronics Wafadrive
1468:Commodore Datasette
1296:Half inch (12.7 mm)
1119:"The Commodore Key"
104:, was made for the
1201:2019-06-17 at the
1096:Compute!'s Gazette
607:Compute!'s Gazette
598:
577:Mini-DIN connector
559:C16/116 and Plus/4
533:position. A small
479:
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301:
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205:mini-DIN connector
177:
156:, as well as many
126:
112:series computers.
36:
1651:
1650:
1647:
1646:
1524:
1523:
1261:Wide (19–25.4 mm)
972:Commodore Gallery
945:"Placar Magazine"
754:Popular Mechanics
647:IBM cassette tape
356:interrupt request
316:
235:side. The use of
146:3.5mm phone jacks
78:compact cassettes
16:(Redirected from
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1533:
1532:
1315:TX-2 Tape System
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1180:Datasette photos
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739:Internet Archive
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947:. Editora Abril
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477:Datassette 1531
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420:3284 * 1.014 ÎĽs
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391:Schmitt trigger
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1190:C2N232 project
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1169:External links
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1014:(April 1981).
1003:
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966:Bo Zimmerman.
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435:shift register
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248:edge connector
201:edge connector
162:dial-up modems
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102:Commodore 1531
82:storage medium
76:device. Using
40:Commodore 1530
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1509:QL Microdrive
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1503:ZX Microdrive
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1196:DC2N Homepage
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1000:. p. 26.
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778:
774:
770:
763:
756:. p. 97.
755:
748:
740:
736:
732:
728:
724:
720:
719:Apple Orchard
716:
710:
695:. p. 112
694:
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340:zero-crossing
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72:'s dedicated
71:
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63:
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57:
53:
50:, later also
49:
45:
41:
32:
19:
1674:Commodore 64
1574:Redwood SD-3
1467:
1154:. Retrieved
1152:. p. 16
1149:
1139:
1127:. Retrieved
1125:. p. 28
1122:
1112:
1100:. Retrieved
1095:
1085:
1073:. Retrieved
1065:
1055:
1043:. Retrieved
1038:
1028:
1019:
1006:
997:
987:
975:. Retrieved
971:
961:
949:. Retrieved
938:
927:
918:
887:
882:
871:. Retrieved
856:
850:
845:, 2012-01-15
838:
827:. Retrieved
815:
805:
791:
772:
762:
753:
747:
737:– via
718:
709:
697:. Retrieved
692:
621:
611:
605:
599:
569:Commodore 16
564:
562:
554:
549:
545:
541:
539:
528:
520:
485:
454:
451:lead-in byte
450:
448:
443:
440:lead-in byte
439:
432:
424:3330 ÎĽs/bit.
415:clock cycles
395:
360:
345:
337:
328:
245:
236:
223:
215:
209:
181:square waves
178:
138:analog audio
136:to and from
134:digital data
127:
106:Commodore 16
101:
98:Commodore 64
65:
59:
51:
47:
43:
39:
37:
1392:IBM 3570 MP
1357:LTO Ultrium
1309:IBM 7-track
1068:. pp.
642:Fast loader
544:and as the
535:screwdriver
430:data rate.
418:this means
258:is ground,
166:read errors
56:portmanteau
1658:Categories
1474:DECtape II
1156:2 November
1129:1 November
1102:6 February
1075:27 October
1045:26 October
873:2018-04-12
829:2018-04-12
699:30 October
663:References
618:MicroProse
588:Popularity
407:(for NTSC
331:media help
241:1000 kByte
237:turbo tape
217:turbo tape
185:parity bit
52:Datassette
824:8750-4383
735:647837472
727:0277-1950
602:U.S. Gold
455:sync byte
446:as well.
444:sync byte
428:300 bit/s
363:read head
233:30 minute
158:S-100 bus
142:RCA jacks
70:Commodore
48:Datasette
18:Datasette
1363:IBM 3592
1339:IBM 3590
1327:IBM 3480
1303:UNISERVO
1274:LINCtape
1268:IBM 7340
1199:Archived
1020:Compute!
998:Compute!
977:20 April
693:Compute!
631:See also
409:0.978 ÎĽs
375:clipping
273:Encoding
212:50 bytes
150:Apple II
116:Features
66:cassette
1638:DDS/DAT
1609:Mammoth
1529:Helical
1321:9-track
1286:CDC 626
1280:DECtape
1248:formats
1039:Zzap!64
951:27 June
623:Gunship
531:azimuth
396:On the
80:as the
1679:VIC-20
1640:(1989)
1623:(1999)
1617:(1996)
1611:(1994)
1605:(1987)
1588:(2003)
1582:(19xx)
1576:(1995)
1570:(1992)
1553:(1992)
1549:Ampex
1546:(19xx)
1517:(1984)
1511:(1984)
1505:(1983)
1499:(1979)
1482:(1981)
1476:(1979)
1470:(1977)
1464:(1976)
1458:(1976)
1452:(1975)
1446:(1971)
1429:(1992)
1423:(1986)
1417:(1972)
1400:(1999)
1394:(1997)
1388:(1995)
1386:Travan
1371:(2006)
1369:T10000
1365:(2003)
1359:(2000)
1353:(2000)
1347:(1998)
1341:(1995)
1335:(1984)
1329:(1984)
1323:(1964)
1317:(1958)
1311:(1952)
1305:(1951)
1288:(1966)
1282:(1963)
1276:(1962)
1270:(1961)
1254:Linear
864:
822:
779:
733:
725:
573:Plus/4
461:Models
402:1.014
267:9 V DC
256:pinout
110:Plus/4
96:, and
94:VIC-20
68:), is
1603:Data8
1568:ArVid
1542:Sony
1456:DC100
1444:D/CAS
1427:Ditto
1351:T9940
1345:T9840
816:Ahoy!
492:Sanyo
426:or a
413:3284
260:+5 V
228:kByte
86:8-bit
1586:SAIT
1158:2013
1131:2013
1104:2016
1077:2013
1066:BYTE
1047:2013
979:2012
953:2017
862:ISBN
820:ISSN
777:ISBN
731:OCLC
723:ISSN
701:2013
571:and
524:C128
379:sine
377:the
231:per
226:100
195:and
152:and
108:and
64:and
61:data
38:The
1621:VXA
1615:AIT
1580:DTF
1551:DST
1544:DIR
1421:SLR
1415:QIC
1398:ADR
1333:DLT
1070:401
501:LED
398:PAL
387:TTL
383:GND
144:or
90:PET
58:of
54:(a
44:C2N
1660::
1148:.
1121:.
1094:.
1064:.
1037:.
1018:.
996:.
970:.
896:^
814:.
771:.
729:.
717:.
691:.
671:^
526:.
422:=
404:ÎĽs
371:DC
262:DC
243:.
92:,
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1238:e
1231:t
1224:v
1160:.
1133:.
1106:.
1079:.
1049:.
981:.
911:.
876:.
832:.
799:.
785:.
741:.
703:.
550:S
333:.
42:(
20:)
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
