Board needs to have some on board RAM to boot, this further confirms an on board RAM failure. Try adding say two RAM chips and see.Yup!
As the chips are taking their time to arrive, I did some more chip-removal practice on the board with the last 3 dram chips (I think I did it much more cleanly this time).
I decided to test the board just in case it would work with just a SIMM (no on board memory). This is what I observed:
So it doesn't seem likely that the board would booth without any on-board RAM, unless I have some more self-inflicted faults somewhere.
- No SIMM or MB RAM: Chime followed by silence until manual power off.
- 4MB SIMM, no MB RAM: Chime followed by ~ 3sec silence followed by death chime.
- 16MB SIMM, no MB RAM: Chime followed by ~10sec silence followed by death chime.