System Identification Byte

BIOS      Model     Submodel
Product             Date      Byte      Byte      Revision
PC                 04/24/81  FF        --        --
PC                 10/19/81  FF        --        --
PC                 10/27/82  FF        --        --
PC XT              11/8/82   FE        --        --
PC XT              1/10/86   FB        00        01
PC XT              5/9/86    FB        00        02
PCjr               6/1/83    FD        --        --
AT                 1/10/84   FC        --        --
AT                 6/10/85   FC        00        01
AT                 11/15/85  FC        01        00
XT-286             4/21/86   FC        02        00
PC Convertible     9/13/85   F9        00        00

The System Identification byte is located at F000:FFFE.  The submodel
and revision bytes can be obtained by calling INT 15h, service C0h.

See also: INT 15h, C0h

Assembly - System ID Byte