A reverse engineering exercice using the Sinclair QL GoldCard Expansion Card as target
Licensed under Cern OHL-S - https://ohwr.org/cern_ohl_s_v2.txt
This is not a functional item, it's only a exercice of reverse engineering to reinforce my skills in Kicad EDA Software.
This project match schematics found on internet, and pictures of the real interface.
- There is no know source of the JEDEC file for the Altera's CPLD
- Some IC can be deprecated and not found on market.
- No information about original has 2 or 4 copper layer, I must use 4, as I was not able to do it in only 2.
Anyway:
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There is not error or warning on the PCB and Schematics
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Schematics seen to be good
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Copper side match 1:1 pictures of internet.
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If you take the risk and do one and it work, please let me know.
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If you have the source of JEDEC file for the CPLD, please let me know.
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If you found any error in the schematic or PLC, please, let me know.
This card is a upgrade of the Sinclair QL computer from 1985, it provide a 68000 processor running a 16Mhz and with a bus wide of 16bit, against original 68008, 7,5Mhz and 8bits bus wide.
Provide Aditional 1920Mb of Ram (16bits) of 2048Mb installed. (128Kb are used as shadow Rom)
Include a up to 4 disk drive (2 + 2 with a add-on card) compatible with 720Kb, 1.44Mb and 2.88Mb (up to 3.2Mb depend of the format)
It have a Real Time Clock.
This was later superseded by the SuperGoldCard, that use a 68020 and 4Mb of Ram.
