Apple III ram problems

["Stefan Miganowicz" <nrsdpms1@tiac.net>]

I was working fooling around with my Apple III.  It was working a couple of
years ago, but the keyboard doesn't work.  I just got another Apple III for
parts, and I took out the keyboard and put onto the one that worked before.
Now it says Diagnostic RAM when I start it.  I swapped out the RAM card that
was connected on the motherboard, and put another one.  It still said the
same thing, so I think a chip is gone on the motherboard.  Before I swap
every chip out to find the bad one(I have another motherboard with corrosion
on it),  could someone tell me what chips are the RAM chips on the
motherboard.  And a wierd pattern comes up and the manual says it is
supposed to tell the bad chip, but all it looks like is a test screen.


Thanks,
Stefan