Arcade Collecting > Restorations & repair
1981 Ms. Pac-Man restoration
Finalheaven:
So here's the update:
I attached an edge repair kit to repair the burnt edge connectors. I removed the 8E IC and installed a 16pin socket and a new 74LS367 chip.
I'm guessing I did all the work right, because the game still boots up, but I'm still plagued by the same issues. Ms. Pac-man still constantly moves down, there's a scrolling dark vertical band that scrolls across the screen from right to left, and if I try to play a game after a few seconds the game corrupts into several changing shapes on a black background and then resets back to the starting screen.
I'm going to try removing all the removable IC's and cleaning their pins while checking the traces on the 8E socket. After that, I'm stumped.
SirPeale:
What feeds that chip?
http://www.datasheetcatalog.org/datasheets/105/488554_DS.pdf
Finalheaven:
Sorry, I don't know enough to answer that question. ???
SirPeale:
Nor I, TBH. But let's look at this logically:
1) the 74LS367 is an input chip. Those inputs are on all the time. Replacing the chip has not solved this issue.
2) according to the schematic I linked above, other than incoming voltages there are only two pins (IIRC, I'm not looking it it right now) that don't have anything to do with inputs. Trace those leads back to those chips and see where they go.
Finalheaven:
The only input that seems to be constantly on is the down direction. The rest work perfectly. My bigger problem now is the instability due to the intermittent resets. If I can get the game to fully load and make it to the credit screen, I can start a game and play for a few seconds before it resets.
I'm about to replace the fuse block and the 6H and 6J eproms, as they're pins are really brittle, etc. I may replace their sockets too.
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