File:SWTPC AC30 Cassette Interface.jpg
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DescriptionSWTPC AC30 Cassette Interface.jpg |
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 |
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Licensing edit
Public domainPublic domainfalsefalse |
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. Public domainPublic domainfalsefalse |
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
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 23:19, 29 November 2011 | 2,100 × 1,200 (299 KB) | Swtpc6800 (talk | contribs) | Higher resolution | |
17:38, 2 August 2008 | 683 × 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 $ |
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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.
Camera manufacturer | NIKON |
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Camera model | E3200 |
Author | Michael Holley |
Exposure time | 10/521 sec (0.019193857965451) |
F-number | f/3 |
ISO speed rating | 50 |
Date and time of data generation | 18:23, 30 September 2005 |
Lens focal length | 7.1 mm |
Short title |
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Width | 2,048 px |
Height | 1,536 px |
Bits per component |
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Compression scheme | LZW |
Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Data arrangement | chunky format |
Software used | Adobe Photoshop Elements 9.0 Windows |
File change date and time | 15:18, 29 November 2011 |
Exposure Program | Normal program |
Exif version | 2.2 |
Date and time of digitizing | 18:23, 30 September 2005 |
Meaning of each component |
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Image compression mode | 4 |
APEX exposure bias | 0.3 |
Maximum land aperture | 3 APEX (f/2.83) |
Metering mode | Pattern |
Light source | Tungsten (incandescent light) |
Flash | Flash did not fire, compulsory flash suppression |
Supported Flashpix version | 1 |
Color space | sRGB |
File source | Digital still camera |
Scene type | A directly photographed image |
Custom image processing | Custom process |
Exposure mode | Auto exposure |
White balance | Manual white balance |
Digital zoom ratio | 0 |
Focal length in 35 mm film | 46 mm |
Scene capture type | Standard |
Scene control | None |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Subject distance range | Unknown |
Supported Flashpix version | 1 |
Image width | 2,100 px |
Image height | 1,200 px |
Date metadata was last modified | 07:18, 29 November 2011 |
Unique ID of original document | adobe:docid:photoshop:f83cd7f9-321b-11da-bb3e-f0bed4be95c8 |
Copyright status | Copyright status not set |
IIM version | 2 |