View Single Post
Old 2nd Mar 2018, 4:43 pm   #2
Ancient Geek
Retired Dormant Member
 
Join Date: Aug 2017
Location: Bristol, UK.
Posts: 136
Default Re: Tandy 200 portable computer - need help

What pins of CN2 did you connect to? In at least some of the Tandy machines the pin numbers on the connectors did not correspond with the pin numbers in the manuals. It should be relatively straightforward to identify the ground pin(s) and then I'd suggest trying each of the other pins in turn to look for an output. Failing that, if you have an oscilloscope, see if there is any output on the 8085 CPU pin 4, which drives the casette output via an inverter gate.
Ancient Geek is offline