File:Acorn 1MHz6502CPUC.jpg
Acorn_1MHz6502CPUC.jpg (640 × 420 pixels, file size: 37 KB, MIME type: image/jpeg)
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DescriptionAcorn 1MHz6502CPUC.jpg |
English: Acorn 1MHZ 6502 CPU card (front).This Acorn 1MHz 6502 CPU card is from a System 4. The part no. is 200,000 Issue 3. The ROMs in IC5/6 are missing as the monitor is not needed and IC7 which can hold an OS ROM is empty. The second INS8154 RAM IO is not installed.The 6502 card is designed for use in the Acorn system 2, 3 and 4 and it plugs into the standard Acorn 8 or 14 slot backplanes. The 6502 microprocessor is run from a 1MHz crystal controlled clock and a TTL device provides address decoding.On the card is 1K of static RAM in 2114's and an 8154 I/O device provides 16 I/O lines, 8 of which connect to an ASCII keyboard via a 20-way ribbon cable connector. Other lines on the 8154 can connect to the cassette interface via the backplane.A second 8154 can be fitted giving a further 16 I/O lines on the 64-way connector and a ROM can be added to carry the Operating System software. (Alternatively this can be on a static RAM card). |
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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 |
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Source | Chris's Acorns: Acorn 1MHz 6502 CPU Direct | ||||
Author | Chris Whytehead | ||||
Permission (Reusing this file) |
Chris Whytehead, the copyright holder of this work, hereby publishes it under the following license: This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license. Attribution: Chris Whytehead, Chris's Acorns – CC-BY-SA-3.0
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current | 00:34, 23 November 2011 | 640 × 420 (37 KB) | Smallbot (talk | contribs) | Commons:Bots/Requests/Smallbot Uploading images from http://acorn.chriswhy.co.uk/8bit_Upgrades/Acorn_1MHz6502CPU.html |
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