Keneg

I have some ordered.

I take it those interface between the keyboard and Pokey? It might be a while before I can really dig into this. It came with the video cable but not the TV switch box. I have an adapter coming from eBay. For testing I have been touching the center pin of the cable to the center wire of a coaxial cable. That Walter me test things, but doesn’t leave my hands free for troubleshooting. I tend to think the problem isn’t the keyboard because the keys that aren’t controlled by Pokey; SELECT, OPTION, START, RESET. work fine. They use the same mylar and connection as the rest of the keys. So how do I test the 4051 multiplexers?

Thanks, that should let me determine whether it is the keyboard or something in the computer.

The new one costs more than I paid for the computer. Wouldn’t mind the price if I could be sure that is the problem. That is why I asked about shorting between pins on the keyboard connector.

Ok, I just looked at the Best site. I guess I would need the US QUERTY Mylar? I reseated all of the larger chips. It looks like all chips on mine are socketed. Still doesnt work. A couple of times when doing the keyboard test I have gotten random characters even without touching the keyboard. The sound, which I believe is a function of Pokey, does work. Is there a way to carefully short pins on the keyboard connector to simulate key presses? This would let me know if it is a keyboard or computer issue.

That is what I thought I read somewhere. I was thinking that I need to look at Pokey. Maybe remove and replace a few times to make sure it is making good contact. Does that sound reasonable?

Ok, that sounds like a bit more than I want to do right now, but I will look at thing very carefully the next time I take it apart. Does the fact that the OPTION, START, SELECT, and RESET keys do work help to eliminate anything?

Ok, I tried that. There was definitely oxidation there. It still isn’t working though. How would I clean the socket it plugs into? Also, if that doesn’t fix it, what’s next? All of the keys to the right of the keyboard seem to work, except help. I was able to get into the self check menu and use SELECT to scroll then START to start the tests. I’m hoping that is a cle to the problem.

I bought a 600 XL cheap from an eBay seller. Once I found a TV that would let me set it to channel 3, the good news is that it works. Sort of. I can get the Ready prompt, but nothing I type in shows up. If I hold down OPTION while turning it on I can run the memory check and it passes. That is certainly good news. The buttons to the right of the main keyboard seem to work, but nothing else. How do I go about troubleshooting this issue?