First post, by polishvito
I'm working on a PS/2 P70 that I recently got. Hard drive was DOA which limited my ability to do much with it, confined to use programs off the floppy drive. Until I got the MCIDE and was able to boot off a CF card. I have DOS 6.22 on the card with various programs.
The problem that I am now running into is the system will randomly hault, and display:
110
?????
To the best of my research, the 110 error code is documented as planar parity error. I don't have any RAM expansion cards in this machine. It has four 2mb 72pin SIMMs.
I have run both the diagnostics on the IBM reference disk, as well as CheckIt (the long comprehensive memory test) and the memory keeps checking out. Something is obviously still wrong. Does anyone have any ideas about how I could go about figuring out where the problem is? I suppose I could remove all the RAM chips but one and keep swapping in and out until I find one that is bad. This is just a tough system to work on while it is disassembled given its Luggable form factor.
https://www.scribd.com/doc/96081065/Code-Errors-IBM - this is a copy of the IBM documentation explaining the error codes.
"110
(Planar parity.)"
"1. Go to
Memory Checkout
2. DIMM card.
3. Detach the expansion unit if it is attached to the computer.
4. System board."
If anyone knows what that is referring to I'd be happy to hear about it.
Oh and I already took the SIMMs out, cleaned them, compressed air to the sockets, put deoxit on the pins and put them back in the machine. Not that I would expect the tests to have completed if contact was an issue.