Showing posts from 2020
When SALT goes bad While trying out my new CoCo SDC with my Color Computer 3, I found some strange issues.  Symptoms included garbage on the screen while turning on, garbage after hitting reset, computer not initializing with any text.  Any cartridge inserted would cause the system to not display any video. I also noticed something odd, the usual double click of the cassette relay when power was applied was missing.  All I heard was a single click, and pressing the reset button did not generate any clicking of the relay. I tried reseating the GIME, swapping out the memory card for a working 512k board, replacing the electrolytic capacitors over the entire board, and finally looking around for any anomalies that might explain why my Color Computer 3 was not working correctly. The basics troubleshooting I had done to this point had gotten me nowhere, I needed to get out the service manual and a digital meter to see what was actually going on.  My first stop was to make sure that