PS/2 Model CL57SX BIOS Version(s)
BIOS Model F8h, Submodel 56h

27C010 EPROM

'U12': Unknown FRU, 28 February 1992, Revision 5
'U12': 39G9519 (same FRU internally), 26 March 1992, Revision 6
'U12': 39G9521 (same FRU internally), 22 April 1992, Revision 7