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Posted Wed Dec 5, 2018 8:06 PM
Posted Wed Dec 5, 2018 8:20 PM
Posted Wed Dec 5, 2018 10:00 PM
Posted Wed Dec 5, 2018 10:42 PM
corroded pins usually match up with corroded socket swipes/wipes. de-oxit the socket, if they are weak or discolored you end up with issues. might as well check them all with de oxit and a magnifying glass
Edited by _The Doctor__, Wed Dec 5, 2018 10:43 PM.
Posted Thu Dec 6, 2018 10:51 AM
try the easy things first - have you reseated all the chips? check for corrosion / dry joints on the PCB etc
It would be helpful if you can test your chips in another, known working atari
here is the FSM etc:
Posted Thu Dec 6, 2018 10:56 AM
he already noted he swapped chips between the two 1200's so it was mentioned the chips worked on the known good 1200...
So after socket inspection/ solder joint trace inspection, it might be time to check that last soldered in chip...
what kind of cord or method are you using for monitor/tv connection?
Edited by _The Doctor__, Thu Dec 6, 2018 10:58 AM.
Posted Thu Dec 6, 2018 11:19 AM
ah, apologies - i shouldve read it fully...
Posted Fri Dec 7, 2018 6:51 PM
I've run across two 1200XL's that had weak connections in the sockets. One was on a RAM socket, and the other was on
one of the ROM sockets. I've also had a delay chip go bad too. You might want to look for 5V DC on all the sockets first
and then follow up with the logic probe. Look for discolored or burned components and also make sure you don't feel any
hot components. One other thing... Are you using the same power supply on both the good and bad computer?
Posted Fri Dec 7, 2018 10:09 PM
Posted Wed Jan 16, 2019 8:30 PM
Posted Thu Jan 17, 2019 7:09 PM
Auto correct got me again, that should have said "every IC".
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