Quoted from pincoder:
It drives me crazy when problems just go away like that, but I'm glad its at least working for now, and that you are finding the test ROMs useful.
IC17 is normally a 2732 chip so yes, it would go there and the image would need to be doubled up on the chip.
I recently tested the ROMs on a system 7 Pharaoh. The MPU board had been modified to use a 2716 in the IC17 socket. Pharaoh also has 7 digit displays. Not sure if all 7's have seven digit displays. Anyway, I noticed a few irregularities. For one, the LEDs on the MPU board are flipped (so bottom is top and top is bottom). The 7 segment LED does some weird but harmless dancing around, and the 7 digit display signals are not compatible with the six digit. Numbers are jumbled up. So all of the ROMs that use displays are pretty much useless. The machine I was on had it's own issues and so I could not be certain the ROMs were functioning properly.
I really need to get a hold of a working system 7 board and go through the ROMs with a fine tooth comb. Then I could change the title of this thread
Have you posted the source for these? I haven't done any Williams specific coding but I have customized some 6800 Bally code and done a lot of 6800 based programming.