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File:Acorn 80 x 25 VDU Interface (back).jpg

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English: Acorn 80 x 25 VDU Interface (back).The Acorn 80x25 VDU interface produces a 1v composite signal to drive the 75ohm input on a monitor. This card came from a System 5. The part no. is 200,019 issue 4.The screen is usually mapped to a 2K area of memory at 1000 to 17FF. An HD68B45SP-2 programmable controller provides the addresses for the screen memory and the horizontal and vertical sync signals. A character generator ROM contains the full ASCII character set (this ROM has a white label which reads "80CHVDU 035B"), special character sets may be obtained by fitting a user-programmed 2716 EPROM. a 12MHz dot clock is used to serialise the data from the character generator ROM and this is then fed to a video amplifier which providesa composite video output from the card. The software to drive the card is contained in the System OS ROM.Here is the 80 character VDU card manual.
Date between circa 2004 and circa 2011
date QS:P,+2050-00-00T00:00:00Z/7,P1319,+2004-00-00T00:00:00Z/9,P1326,+2011-00-00T00:00:00Z/9,P1480,Q5727902
Source Chris's Acorns: Acorn 80 x 25 VDU Interface Direct
Author Chris Whytehead
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Chris's Acorns This photograph originates from Chris's Acorns, a collection of material relating to Acorn Computers. The photograph was created between ~2004 and 2011 by Chris Whytehead. Please use the photo while adhering to the license including the attribution to "Chris Whytehead, Chris's Acorns – CC-BY-SA-3.0".

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Attribution: Chris Whytehead, Chris's Acorns – CC-BY-SA-3.0
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current22:36, 14 December 2011Thumbnail for version as of 22:36, 14 December 2011640 × 424 (47 KB)Smallbot (talk | contribs)Commons:Bots/Requests/Smallbot Uploading images from http://acorn.chriswhy.co.uk/8bit_Upgrades/Acorn_80x25VDUIF.html

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