Brought a few of muddymusic’s PCB’s back with me from the recent Play:Expo. One of them was an original Willow PCB set.
The original fault was some lines through all the graphics but when I got it home there was nothing at all. I found with a little flexing of the B board then the game would run so I set about replacing the sockets that I know are quite unreliable in their old age. This didn’t make any difference.
I started checking the connectors that connect the B board to the A board and found 2 pins on CN2 that had no continuity through. These corresponded to A0 and A1 for the program ROM’s so that would explain why it wasn’t booting. Luckily Ive amassed a lot of CPS1 boards over the years and desoldered a 32 pin connector from the donor board and the Willow board.
This is what I got
The jailbars are back.
Luckily, I was expecting the C board to be broken before I got the game so I had modified the program code to use a B_21 C board instead.
This seems to now work fine but more testing will need to be done. This will most likely do until such time a new Willow C board can be found.