so I had quick prob around the area and the transistors look good..I also tested the RAM and CPU in a MOON PATROL.
I disabled the watch dog to no effect. The CPU keeps resetting from the custom at F1 no doubt.
UPDATE:
I've been probing away at the board for several hours. The CPU, RAM, buffers, CTC, seams to working.
But I do have that watchdog barking, so I'm still working on it.
I found the Midway MCR guide online and had a read. It was helpful.Kinda filled in the gap for the Custom at 1F, basically is sequences the boot and shutdown access to the book keeping RAM at 5G.
After I make sure I have the parts, I might just replace the address, control and data buffers to the CPU. Can't hurt. Then if that doesn't work, replace the sockets to the RAM. I might even just try and source another couple of Z80B's as apparently they're pritty flakey.