File:SWTPC AC30 Cassette Interface.jpg

From Wikimedia Commons, the free media repository
Jump to navigation Jump to search

Original file ‎(2,100 × 1,200 pixels, file size: 299 KB, MIME type: image/jpeg)

Captions

Captions

Add a one-line explanation of what this file represents

Summary[edit]

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.
Date
Source Transferred from en.wikipedia; transferred to Commons by User:Liftarn using CommonsHelper.
Author Swtpc6800 Michael Holley
Other versions
  • SWTPC 6800 Computer
    SWTPC 6800 Computer
  • SWTPC AC30 Cassette Interface
    SWTPC AC30 Cassette Interface
  • SWTPC AC30 Cassette Interface
    SWTPC AC30 Cassette Interface

Licensing[edit]

Public domain 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.

Original upload log[edit]

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

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current23:19, 29 November 2011Thumbnail for version as of 23:19, 29 November 20112,100 × 1,200 (299 KB)Swtpc6800 (talk | contribs)Higher resolution
17:38, 2 August 2008Thumbnail for version as of 17:38, 2 August 2008683 × 394 (65 KB)File Upload Bot (Magnus Manske) (talk | contribs) {{BotMoveToCommons|en.wikipedia}} {{Information |Description={{en|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 $

You cannot overwrite this file.

File usage on other wikis

The following other wikis use this file:

Metadata

This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.

Retrieved from "https://commons.wikimedia.org/w/index.php?title=File:SWTPC_AC30_Cassette_Interface.jpg&oldid=458725141"