I have an Apple ii plus that boots to an Apple II screen and cursor but when I try to load and disks I get garbage on the screen. It will execute a small basic program I type in fine. I know one of the 6 ROMs is bad so I’m booting it off a ROM card and I tested the romcard on another system and the ROMs on the card are all good. I pulled all the logic chips cleaned and tested each one and they were all good. There was corrosion on several pins on the LS32 socket and one of the pins (the ground) was so weak it broke. I removed the socket cleaned everything and installed a new socket and IC. All traces show good continuity from the IC leg when installed to the other end of the trace. Still won’t read disks. I’ve checked all the ram and they are good. I swapped the processor, no change. I’ve moved the romcard and the disk controller card to different slots and no change.
Any suggestions or ideas?