Jr Pacman Ram Error - Can someone post the error code locations?

barakawins

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Jr Pacman Ram Error - Can someone post the error code locations?

Was working on a Jr. Pac for a friend this weekend. The board came up with a ram error. I believe RW error A 0. This appears to be corrupt and is a video ram issue. The game wants to come up and sometimes the title screen comes up and then blanks out and I get the ram issue. Does someone have a list of ram error codes that they could post for the ram locations? Much apprieciated.
 
Hmm... I don't have that in the manuals I have for Jr...

RJ
 
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Hmm... I don't have that in the manuals I have for Jr...

RJ

You probably have the kit manual which is very basic. I have the full manual at home, send me a pm to remind me to check it.
That error doesnt look right to me, looks garbled. There are several 7489 rams on a Jr and they almost always have badly tarnished and broken legs. This is the first thing I check when I get a jr on the bench.
 
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7489 ram!

You were right! Location 2H 7489 ram crumbled in my hand!!!!!!!! What ram is this? Is there a substitute for this ram? Can 2114 sub?
 
It's a Bipolar RAM in the 7400 series. Open Collector output if my memory serves me correctly.

RJ
 
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