SpidersWeb
Veteran Member
I'll just list what's happened with this board:
- Perfectly working 64-256KB motherboard I had as a spare
- RAM and ROM and U84 taken from very bad condition 640KB board
- E2 soldered
- No start, so used Supersoft/Landmark ROM, found bad RAM chips and replaced. A0000 OK, including self-refresh, no abnormal faults.
- Reinsert IBM ROM's, no start
- Reinsert IBM ROM's it was using before mod, no start
The IBM ROMs from the damaged XT are definitely goneburgers.
But the ROMs that were in it before were checked, and rewritten - I tried both the May 1986 BIOS and the 1982 BIOS. It isn't having it.
- Installed DTK ERSO BIOS ROM (2764) - machine starts but complains about KB error even when KB is connected and keyboard doesn't respond - so perhaps another job? Not sure if DTK might've accessed the keyboard differently or it's broken.
- Installed Supersoft/LandMark ROM again - says everything is golden (also an 8K image though)
Any ideas?
- Perfectly working 64-256KB motherboard I had as a spare
- RAM and ROM and U84 taken from very bad condition 640KB board
- E2 soldered
- No start, so used Supersoft/Landmark ROM, found bad RAM chips and replaced. A0000 OK, including self-refresh, no abnormal faults.
- Reinsert IBM ROM's, no start
- Reinsert IBM ROM's it was using before mod, no start
The IBM ROMs from the damaged XT are definitely goneburgers.
But the ROMs that were in it before were checked, and rewritten - I tried both the May 1986 BIOS and the 1982 BIOS. It isn't having it.
- Installed DTK ERSO BIOS ROM (2764) - machine starts but complains about KB error even when KB is connected and keyboard doesn't respond - so perhaps another job? Not sure if DTK might've accessed the keyboard differently or it's broken.
- Installed Supersoft/LandMark ROM again - says everything is golden (also an 8K image though)
Any ideas?