(Topic ID: 321534)

Looking for help on third flash on MPU-200

By wild_pins

31 days ago


Topic Heartbeat

Topic Stats

  • 55 posts
  • 10 Pinsiders participating
  • Latest reply 10 days ago by Quench
  • Topic is favorited by 1 Pinsider

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Added OD lines - RW is for U8 as well (resized).png
U13 behaviour seems to work fine and passes when U8 contains #0 (resized).png
analysis of original 5101s (resized).png
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U8 and U13 not reading out what was written in (resized).jpg
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There are 55 posts in this topic. You are on page 2 of 2.
#51 11 days ago
Quoted from wild_pins:

Small update, I've been waiting for new 5101. This time I thought I'd try from my local electronics store.. took about a week to get them in the shop... picked them up today and they were branded "PCD 5101AP".. Other markings are "MRM8231 2 Y" and at the bottom "21655".
Can't find a datasheet, though.. and some sites refer to the manufacturer as "Sig", though no manufacturer is on the chip .. will give it a go tomorrow and see what it does, but my hopes are not that high.

that is a good part number. The A suffix is probably insignificant, I don't see anything in the datasheet about it.
https://cdn.datasheetspdf.com/pdf-down/P/C/D/PCD5101_Signetics.pdf

#52 11 days ago
Quoted from Quench:

Manufacture date: 31st week of 1982

Probably short for Signetics. Philips bought Signetics which might also explain the early date code.
Post pictures of the chips when you get them.

Got them, see attachment

20220922_221558 (resized).jpg
#53 10 days ago

They look legit. Now with the suspense, do they work?

#54 10 days ago
Quoted from Quench:

They look legit. Now with the suspense, do they work?

They do! Six flashes on the bench! now I can continue with testing everything else. But first will double check if all the voltages coming in are good enough before I plug in the board in the pin.

Thank you so much everyone in helping me better understand this board and guiding me through the process. I feel I better understand it now and will be much more able to debug the next thing that comes my way.

#55 10 days ago
Quoted from wild_pins:

They do! Six flashes on the bench!

Great to hear!
It's been an interesting thread - I like it when people go a little deeper in diagnosis rather than blindly replacing parts/boards.
Good luck restoring this game!

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