Re: Resurrecting an MTX500.
Posted: 01 Sep 2019 12:22
Well, it's September and I'm back to the MTX...
It looks like the GAL acted as a lightning rod and took all the damage. Phew!
After I replaced that I have a working machine again. If anything, for some unknown reason it seems a little more stable than it did before with CP/M running for longer and more reliably than it did before (though not as well as on my other machine).
What I might do is leave things as they are and bring the machine along to Memofest and let the whole team try to diagnose the final issues with the machine.
Anyway, the upshot is that I now have a complete set of replacement chips for the machine, excluding memory, the sound chip and that one 74LS chip which has gone out of production. (I have other memory chips but I can't guarantee that they work as I don't have a tester.)
It looks like the GAL acted as a lightning rod and took all the damage. Phew!
After I replaced that I have a working machine again. If anything, for some unknown reason it seems a little more stable than it did before with CP/M running for longer and more reliably than it did before (though not as well as on my other machine).
What I might do is leave things as they are and bring the machine along to Memofest and let the whole team try to diagnose the final issues with the machine.
Anyway, the upshot is that I now have a complete set of replacement chips for the machine, excluding memory, the sound chip and that one 74LS chip which has gone out of production. (I have other memory chips but I can't guarantee that they work as I don't have a tester.)