Hi all,
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:
http://www.applelogic.org/APPLEASICs.html
But it still didn't work, so I tried the 341-0027.bin file from here:
http://mirrors.apple2.org.za/Apple%20II%20Documentation%20Project/Interface%20Cards/Disk%20Drive%20Controllers/Apple%20Disk%20II%20Interface%20Card/ROM%20Images/
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?
Thanks
Phil
Illegal bit errors indicate that the prom burner has detected a burned fuse that is not supposed to be burned, so you need to try with a different PROM part.
regards,
Mike W.
That's what I thought, so I tried another new PROM and I get the same error.
I have no problem (re)programming either of the PROMs with the first .bin file, only the second one. Strange.