I’m on a roll at the moment and this one was one of the smoothest repairs Ive ever done.
Here I have a couple of boards from muddymusic. First up is Bionic Commando.
There was a ribbon cable missing completely. Ive got loads of these spare so that was pretty easy to replace.
Test time. The game booted to garbage.
First step was to check the program ROMs and found this on one chip
and this on another
With those sorted the game now boots although all the text is a bit messed up.
With the help of the MAME source which specifically identifies which ROM is responsible for text I pulled the ROM and read it. Each read gave a different CRC so it failed its verification.
Burning a new EPROM for TS-08 brought back all the text.