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- I don't know if (LS) TTL can withstand 7.5V for very long, but perhaps I'm lucky.16 KB (2,994 words) - 16:04, 12 April 2022
- ...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 mod22 KB (3,883 words) - 09:57, 13 August 2024
- ...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 u24 KB (4,434 words) - 15:26, 26 March 2024
- ...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 circui71 KB (12,565 words) - 18:18, 5 April 2022
- ...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 Z80.83 KB (15,037 words) - 16:28, 29 July 2020