PORTIBM PC Portable (uses same BIOS as XT) 4C80-4C83	 - EISA(Enhanced Industry-Standard Architecture) A 32-bit superset of the IBMInternational Busiuness Machines ATIBM PC AT's expansion bus (which is now known as the ISA or Industry-Standard Architecture bus). board product ID (board in slot 4)
SeeAlso: PORTIBM PC Portable (uses same BIOS as XT) 1C80h-1C83h