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ZX81 in SPLD chips

ZX81 in four or five SPLD chips, by Ian Bradbury.

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Four SPLDs (two GAL22V10, two ATV750)
One extra ATV750 for keyboard remapper, not needed with original key matrix)
Logic equations
No circuit diagram (but should be deducible)

K8082.pdf

My best guess at the wiring.

Adobe Portable Document Format - 45.74 kB - 01/12/2018 at 03:05

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ZX81_in_SPLD_chips.zip

HTML documentation. Start page is ZX81_SPLD.htm

x-zip-compressed - 113.32 kB - 01/10/2018 at 23:36

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