Model 25 (8525 - 8086 CPU)

2x 27256

Both BIOS pairs listed have an internal FRU the same as external, 
but otherwise appear to be identical - Maybe intended (but not
implemented) for 'Type 1' and 'Type 2' identification.

'U17': 00F2092
'U22': 00F2093
BIOS Revision '00'
06/26/1987
Typically on 'Type 1' planar

'U17': 00F2122
'U22': 00F2123
BIOS Revision '00'
06/26/1987
Typically on 'Type 2' planar