File:SWTPC AC30 Cassette Interface.jpg
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Original file (2,100 × 1,200 pixels, file size: 299 KB, MIME type: image/jpeg)
Summary
| Description |
English: The Southwest Technical Products Corporation (SWTPC) AC-30 tape interface for early personal computers was introduced in May 1976 for $80. Shown with a Sankyo ST-30 cassette recorder, a SWTPC 8K BASIC tape and a TSC 6800 Assembler tape. When the first home computers were introduced in 1975, floppy disk systems cost $2000. Storing data on audio cassettes was the low-cost but slow option that most hobbyists used. SWTPC designed their AC-30 Cassette Interface to meet the proposed "Kansas City Standard" data format. The binary data was recorded using 1200 Hz and 2400 Hz at a 300 baud data rate. At 30 bytes per second it took over 4 minutes to load an 8K file. Photo taken with a Nikon E3200 camera using tungsten lighting by Michael Holley in September 2005. |
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| Source | Transferred from en.wikipedia; transferred to Commons by User:Liftarn using CommonsHelper. |
| Author | Swtpc6800 Michael Holley |
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Licensing
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This work has been released into the public domain by its author, Michael Holley. This applies worldwide. In some countries this may not be legally possible; if so: Michael Holley grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.
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Original upload log
The original description page was here. All following user names refer to en.wikipedia.
- 2006-02-24 03:39 Swtpc6800 683×394×??? (66450 bytes) Southwest Technical Products Corp. AC-30 Cassette Interface. This recorded computer data in the Kansas City Standard format on audio cassetttes. Introduced in July 1976 and the kit cost $80. Photo by Michael Holley 2005
File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 23:19, 29 November 2011 |  | 2,100 × 1,200 (299 KB) | wikimediacommons>Swtpc6800 | Higher resolution |
File usage
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