Model 80 'Type 3' (386DX-25MHz), 27C512-1JL EPROM x2:

U140 ("EVEN"): FRU 64F3084 (identified internally as FRU 64F3088)
U141 9"ODD"): FRU 64F3085 (identified internally as FRU 64F3089)
BIOS Revision '1', date of 21 NOV 1989

U140 ("EVEN"): FRU 64F4355 (same FRU ID internally)
U141 ("ODD"): FRU 64F4356 (same FRU ID internally)
Later, yet unknown revision (likely '2'), date of 15 FEB 1990