How does a PC read an old school analog joystick?
It might be more interesting than you think.
Or how to make an ADC out of a 555 Timer…
IBM PC Jr Technical Reference Manual
Tandy 1000 Technical Reference Manual
Easy repair and teardown of the rather obscure Tektronix DMM916 Multimeter. Ebay auction: https://www.ebay.com.au/itm/225848873343 Forum: …