Batsugun help needed!

[Hammy]

Hey anyone got a batsugun lying around? Got one in recently with N00b damage on the processor and ram.
Got it mostly figured out but seem to be missing a connection to pin 19 of the 68000.
If someone with one can check this pin it would be nice to get this one done

Thanks!

 

[ekorz]

I am not convinced that it is connected anywhere. Probed for a while. Looked at the pin under a zoom. I don’t think this is 3 layer...

it’s an output according to a pinout I see, VMA active when low, and looks like it remains high on my scope.

 

[Hammy]

Thanks for that! Good stuff, i can go ahead
There is a GND and +5 plane on here so chances are if it's not connected to those it's NC.

Hopefully update this in a few days wonder what it will be like after the rebuild

 

[Hammy]

Cheers! I got it to do things! , now its dropping clues it should be easy to get to the end
@chomponooch

View: https://youtu.be/hhLzQYgEQ_Y

 

[LHantz]

Just seen this on YT, hope u get it fixed. I have the original PCB if you need anything cheers.

Meant to say, I can lend you the original PCB if that would help

 

[Hammy]

Cheers for the offer, the gal dump was good

replaced:
4x 6264 ram, main CPU, GAL16 and multiple line fixes (n00b damage on processor)

View: https://youtu.be/qdd3MGchg3w

 

[LHantz]

Excellent, never doubted you for a second!

 

[Hammy]

Excellent, never doubted you for a second!

The "untested" GAL was where the doubts were! If that was bad it could be sat forever in the jank room waiting for a good dump.
Gal looks to me as tested good (can't see it causing a sound problem)

Also it's running ATM with the wrong CPU (12mhz vs 16mhz) it could be a timing problem on the sound.