ZONX81plus41 PSG Board with sd-card interface for the ZX-81 now with rev 1.2 firmware on GitHub

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Revision as of 20:45, 15 March 2022 by Mahjongg (talk | contribs) (started with ZX-81 PSG expansion board)
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May 15, 2022 decided to create a ZX-81 compatible version of my PSG board for mt ZX-81 clone the ZX81+38 or a real ZX-81

Today I got news that a ZX-81 enthusiast built my ZX-81+35 and the supporting PSG board, and patched the AY-3-8912 I/O port based sd-card interface to make it work, by adding a few transistors, and then also wrote SD-card drivers based on this interface, and added a menu driven interface so you can load games (.ROM files) from a regular SD-Card. It was a shock that the sd-card interface I had imagined, but had abandoned as impractical could really work, and I saw that with the addition of 32K RAM and 16K of ROM (OTP ROM) this could be a very great expansion board for any ZX-81 (or my own ZX81+38 clone). So I started this new project!

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