Hi to all !
I'm currently restoring a PAL Apple //e motherboard ref 802-0073-B.
It was modified at some point to be //c enhanced (65C02 with modified ROMs and extra wires).
I revert all the modifications and it works great except while displaying DHGR screens : there are verical lines.
Here are the screenshots.
All the IC seems okay (MMU and IOU have been tested with another motherboard). I'm pretty sure it's a missing or bad connection.
I do have checked all the connections to the RAM (Figures 3.9 and 5.2 in Understanding the Apple //e). All good.
Any ideas ?
Thanks a lot.