Path: utzoo!mnetor!uunet!husc6!bbn!rochester!pt.cs.cmu.edu!andrew.cmu.edu!dp1g+
From: dp1g+@andrew.cmu.edu (Demetri Patukas)
Newsgroups: comp.sys.tandy
Subject: Model 4P with bad RAM
Message-ID: <4WUwM8y00XcSQ5LUE3@andrew.cmu.edu>
Date: 8 May 88 02:20:56 GMT
Organization: Carnegie Mellon
Lines: 23


I have a Model 4P with a bad ram chip.

After swapping some chips around I found the offending chip.

So I thought, "no problem, just stick in a 4164 and off we go"

Didn't work.

So... can anyone tell me what the story is on the ram chips in the 4P?
They have the number "8040665" stamped on them with both Motorola and
Tandy logos.  I have a friend who used to do upgrades on these who
claims that these should be the same as 4164's, but when I used a 4164
it always read zero in that bit position.  Are these special Tandy
rams?  Can I maybe bend some pins and use a 4164?

Also, although my machine has sockets for a second set of 64K, my
friend tells me that I will need a new PAL chip to get the machine to
recognize it.  Where can I get the new PAL?  How much should I expect
to pay?


        demetri patukas         internet: dp1g+ @ andrew.cmu.edu