So I have a spare Disk II card with a missing P5 PROM. I thought I could get a TI 28LA22N PROM and program it with my DATA I/O 29b and the Unipak 2.
First I tried the 3410127A.bin file from here:
But it still didn't work, so I tried the 341-0027.bin file from here:
and I ended up with an Illegal bit error when trying to program it. It also didn't work.
Does anyone know what I'm doing wrong?