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File:SWTPC AC30 Cassette Interface July 1976.jpg

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Summary

Description
English: The Southwest Technical Products Corporation (SWTPC) AC-30 tape interface for early personal computers was introduced in May 1976 for $80. 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.
Date
Source Scanned from the July 1976 Byte magazine (inside front cover) by Michael Holley Swtpc6800
Author Southwest Technical Products Corporation, San Antonio, Texas
Permission
(Reusing this file)

This advertisement did not have a copyright notice and is in the public domain.

From the US Copyright Office Circular 3. Page 3, Contributions to Collective Works. (A magazine is a "collective work.")

A notice for the collective work will not serve as the notice for advertisements inserted on behalf of persons other than the copyright owner of the collective work. These advertisements should each bear a separate notice in the name of the copyright owner of the advertisement.

Other versions
  • SWTPC 6800 Computer
    SWTPC 6800 Computer
  • SWTPC AC30 Cassette Interface
    SWTPC AC30 Cassette Interface
  • SWTPC AC30 Cassette Interface
    SWTPC AC30 Cassette Interface
  • SWTPC AC30 Cassette Interface
    SWTPC AC30 Cassette Interface

Licensing

This work is in the public domain in the United States because it was published in the United States between 1929 and 1977, inclusive, without a copyright notice. For further explanation, see Commons:Hirtle chart as well as a detailed definition of "publication" for public art.
Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (50 p.m.a.), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties.

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July 1976

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Date/TimeThumbnailDimensionsUserComment
current01:04, 30 January 2012Thumbnail for version as of 01:04, 30 January 20122,475 × 3,263 (1.12 MB)Swtpc6800=={{int:filedesc}}== {{Information |Description={{en|1= The Southwest Technical Products Corporation (SWTPC) AC-30 tape interface for early personal computers was introduced in May 1976 for $80. When the first home computers were introduced in 1975, flopp
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