I've been working on a Granny and the Gators with Vidiot deluxe board issues (among other problems), but my primary concern is the vidiot board. I've managed to get the board to boot and enter the communications screen and the color bar screen, but the communications screen isn't showing me what I expect to see. Instead I only get what looks like the left-hand sidebar graphics all scrunched up at the bottom of the screen. See here:
I've verified all of the roms and tested the 6119 and the 74139 at U14. I've also replaced the pots, although I doubt that's related. I'm relatively certain that the TMS9928's are fine, or else I don't think I'd see anything on the screen at all. i also have a working vidiot board from a Baby Pac and swapping the TMS9928 from that board into either spot on the VD board changes nothing.
It looks to me like a rom issue or addressing problem or something, but I'm clueless with this sort of thing and hate working on video game boards, which is basically what this is.
If anyone can help, I would be very grateful. Please let me know if there's suggestions on where I can look next.
Corey