I have a non-working Atari XEGS that I'm trying to fix. I have already replaced two RAM ICs, as they were clearly faulty.
But the machine will still not show anything but a black screen, and no sound appears if I try to run the built in Sound test.
No chips are hot now that the RAM has been replaced, and the scope doesn't show me any obvious culprits ... yet.
I have un-soldered the ROM, and I'm attempting to read it using a TL866-II Plus EPROM reader/writer.
I always get a "pin detection type error" pointing to pin 1.
This might not necessarily point to a problem in itself and disabling "pin detection" in the software bypasses this.
Whatever 27C256 type EPROM device (which is interchangeable with the XEGS ROM) I have selected in the reader software, it will only read 100% "00 bytes" or only "08 bytes".
I.e. either the ROM is faulty or the TL866 is not reading it correctly.
Has anyone managed to read these ROMs using the TL866-II ?
(I can read other devices on the TL866, e.g. 27128 EPROMS)