PORTIBM PC Portable (uses same BIOS as XT) 0C80-0C83 - 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). system board ID registers 0C80 R- bit 7: unused (0) bits 6-2: manufacturer ID, first compressed ASCII char bits 1-0: manufacturer ID, second compressed ASCII char (high) 0C81 R- bits 7-5: manufacturer ID, second compressed ASCII char (low) bits 4-0: manufacturer ID, third compressed ASCII char 0C82 R- reserved for manufacturer's use 0C83 R- bits 7-3: reserved for manufacturer's use bits 2-0: 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). bus version