ZX81 on HackADay
ZX81 on HackADay
HackADay has an article on the Maplin I/O board http://hackaday.com/2016/11/21/sinclair ... ars-later/
2X Timex Sinclair 1000, ZX81, ZX80Core, 5X 16K Ram Pack, ZXBlast, ZX P file to Ear Input Signal Converter, Elf II