The BIOS ROM contains a block of information which encodes the identification of the machine, and indicates the date the BIOS was created. The BIOS ID Block begins at FFFF:5.
---------------------------------------------------------- FFFF:5 Date of BIOS release (format: MM/DD/YY; 8 bytes) ---------------------------------------------------------- FFFF:D 00h (Reserved) ---------------------------------------------------------- FFFF:E FEh (System model ID) ---------------------------------------------------------- FFFF:F 00h (CkSum - Unused) ----------------------------------------------------------