(Topic ID: 284373)

Early announcement of a Game Plan MPU redesign

By Ilikewires

3 years ago


Topic Heartbeat

Topic Stats

  • 185 posts
  • 62 Pinsiders participating
  • Latest reply 12 days ago by T2S88
  • Topic is favorited by 35 Pinsiders

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Topic poll

“How likely are you to buy a new Gampelan MPU in the next year?”

  • Yes 67 votes
    74%
  • No 23 votes
    26%

(90 votes)

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#11 3 years ago

I've been working on one as well... might hold off a little on finishing it as I'm curious about this one.

I've been working on the boards for Game Plan machines for a Sharp Shooter I have that's down.

Only needed the MPU and displays. I've finished the displays, though, so it hasn't been a total waste.

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#13 3 years ago

For the *64 you have:
2 to A12
23 to A11
22 to A15
20 to /MREQ
?

Seems like it's running the first part of the code as it's doing it's flashes. Maybe it's just not seeing higher addresses? Sounds like you're close though... further along that I am. I've been going through the schematic and working my way back... I've done back to the Z80 but haven't ran the nets fully for the RAM and a few misc. pieces. My layout is for ONLY a 2764 so I skipped a couple of steps and didn't bother with strappings.

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