LR> I have an old IBM PS/1 2155-G76 system that someone gave to
 LR> me.

 LR> . Does anyone have an old
 LR> riser board that either came from a PS/1 2155 

 MR> I've got something labeled "7X6 RISER" with part numbers:
 MR> IBM CORP. 1996  FRU#12H2025
 MR> It has 6 ISA slots and 2 PCI along with a 6 flat-pin power connector.
 MR> Do you think it would work with your machine?

Nope, looks like yours is totally different.
 
Yours, all slots and connectors on one side.
http://www.c-techonline.com/images/12H2025.JPG
 
His, as shown on ebay (the only image I could find),
4 on one side + 1 on the other, riser stands vertically.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=5175903708
 
A lot like mine, except I only have 3+1 slots.
http://www.c-techonline.com/ges/61H0188.JPG
 
This looks more like what he's got, 4+1, though don't 
think PCI was around back in PS/1 days:
http://www.c-techonline.com/images/07H1265.JPG
 
Another version, only 2 "shared" PCI slots.
http://www.c-techonline.com/images/12H0845.JPG


--- Maximus 3.01