I'm an MCA freak and have a good majority of the PS/2 models. The
IBM internal SCCI connector was 50pin and some models had
onboard SCSI as you likely know.
I checked my archives and got this from an MCA AboveBoard thread
I culled from the PS/2 newsgroup. No mention in the thread about a
50pin connector tho. Mainly about getting the memory recognized.
The memory chips were as you describe.
ftp://download.intel.com/enduser_reseller/above_board_memory_boar
ds/abmc.exe
Includes the SOFTSET.exe utility
It came up blank and the archive no longer had the enduser_reseller
folder. Some zealous employee must have seen the reseller title and
deleted it. Blast !! That means the Softset.exe is also likely gone.
I have an MCA board here (probably pulled from a PS/2,
but I really am
not sure where it came from).
Its marked as an Intel Above Board MC. And currently has 8 30 pin SIMMS
on it (1 MB each it looks like). From what I can find, I think this is
just a normal above board memory expansion card (max 32 MB?)
Most early PS/2s had a 16MB limit from the 8580 on, but there were
workarounds.
However, there is also a 50 pin IDC connector on it. Is that for
connecting to a daughter card? I just want to confirm that fact, and
that this isn't really some kind of a SCSI controller with a nice buffer
on it. I thought the Above Boards were just memory cards, but you never
know. (maybe if I could find something about them on Intel's site... but
their AboveBoards support section seems to have vanished)
-chris
<http://www.mythtech.net>
Lawrence
lgwalker(a)mts.net
bigwalk_ca(a)yahoo.com