fcjim
Well-known member
I will lead off with the request before the explanation for it: Could somebody with a Dig Dug Rev B (the one with the three Z80s all along one edge) please take a couple close ups of the board in the area of 3H and 3J?

Now the backstory: I've been working on repairing this DD board. It would boot up and run the attract screen, but with a lot of graphics errors, including a double/ghost image vertically on sprites and characters. Looking over the board, I noticed that there was what looked like heat damage in the area of 3H and 3J, and it had been repaired with a messy bit of wires soldered to various spots. Since this was the only spot on the board with obvious physical damage, I decided to redo this area a bit neater to see if it had anything to do with the problem. Unfortunately I didn't snap a photo of the arrangement of these wired-in traces before I started removing everything, only after everything had been removed.
I removed the chips and the hacked-in trace repairs, installed new sockets, and jumpered everything up according to the schematic. Installed two new LS367s and fired it up, and now it doesn't boot at all. It displays a messed-up RAM error and continually resets, the primary CPU is getting a reset signal that toggles back and forth a few times a second. Considering that I didn't touch any other area of the board, and it was working better than this before I started futzing with this area, I'm assuming I have connected something wrong, but can't figure out what. That's where the close-up comes in, I would like to be able to compare mine to what a good board looks like so I can see exactly where my missing traces were supposed to look like. I realize I won't be able to see the traces as they run below where the chips should be, but even seeing the areas surrounding the chips would be helpful.
Thanks!

Now the backstory: I've been working on repairing this DD board. It would boot up and run the attract screen, but with a lot of graphics errors, including a double/ghost image vertically on sprites and characters. Looking over the board, I noticed that there was what looked like heat damage in the area of 3H and 3J, and it had been repaired with a messy bit of wires soldered to various spots. Since this was the only spot on the board with obvious physical damage, I decided to redo this area a bit neater to see if it had anything to do with the problem. Unfortunately I didn't snap a photo of the arrangement of these wired-in traces before I started removing everything, only after everything had been removed.
I removed the chips and the hacked-in trace repairs, installed new sockets, and jumpered everything up according to the schematic. Installed two new LS367s and fired it up, and now it doesn't boot at all. It displays a messed-up RAM error and continually resets, the primary CPU is getting a reset signal that toggles back and forth a few times a second. Considering that I didn't touch any other area of the board, and it was working better than this before I started futzing with this area, I'm assuming I have connected something wrong, but can't figure out what. That's where the close-up comes in, I would like to be able to compare mine to what a good board looks like so I can see exactly where my missing traces were supposed to look like. I realize I won't be able to see the traces as they run below where the chips should be, but even seeing the areas surrounding the chips would be helpful.
Thanks!
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