in fact just a generic Motorola MCU but with specific programming so true, only another board semi-dead or dead for another reason. Good to know usually they suffer from failing quartz crystal which is easy to fix.
I equipped myself with 102 channel LA from 00s so... now just to learn the hw, sw, and wire it up all together. This one is a funny ride!
All caps were replaced at start of this fun, clock chip measured etc.
Visual inspection under microscope did not show any damage. Perhaps I have to do this hard way with probing between MCU & Sonora & Ram & Rom alltogether. 64x3 + other singals IPLx3 FCx3 DSACKx2 etc. Good for winter Does this board packs more than just 2 layers?
I replaced all F245 & ALS241 chips with the ones from the working board - no change - good board works well with parts soldered in from the bad one - bad one does not work
I replaced all video chips with the ones from a working board - no change
Graphic DAC is just a DAC that copies from VRAM, good board chimes without it
Good board chimes without VRAM although chime is dissorted
LCIII against what is said will display image without PRAM battery, will also chime good without one
For this EGRET chip I am scared to touch it... so don't know. On the bad board it releases reset and pokes with IPL states so I will assume somehow okay...
I built with the default options (just "make all"). It appears debugging is on by default, so I do have debugging on.
I did built with the latest version. I forked your repo so that I could make updates to the README with some instruction updates. But my fork is up to date with your repo.
Is the "TX" debug port just a RS-232 type signal? What baud rate did you use? I can hook up a TTL receiver and try to capture some info, if that helps.