I have a Maplin ZX81 Voice unit for the I'm keen to test with my ZX81. It looks like I will need to build an expansion I/O board as I can't find any available.
Has anyone else built their own DIY I/O board and has any recommendations or advice?
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SPO256 data sheet for comparison ...
http://spatula-city.org/~im14u2c/sp0256 ... 56-AL2.pdf
An item that may be of interest can be found here....
http://www.schematicsforfree.com/archiv ... sizers.pdf