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I don't know if (LS) TTL can withstand 7.5V for very long, but perhaps I'm lucky.

...DB9-Connector-MAX232/32722395554.html MAX3232 boards] and I had some CH340 ttl-serial-usb lying around. So I took one of both and connected them to my mod

...N connector to the top left of it, it doesn't use RS232 levels but just 5V TTL levels. Not a serial interface but the Centronics connector top middle is u

...cuit is that it works with modern CMOS logic (the original ZX81 used an LS TTL compatible input for the cassette input, and because of it the input circui

...nto a module (sub-sheet) of its own. I think that I need to get rid of the TTL logic, and invent a simpler mechanism to interact with the Z80.