Machine Identification Byte
Model Sub-Model Machine FF ?? Original IBM PC 4/24/81 ?? IBM PC 10/19/81 ?? IBM PC 10/27/82 FE ?? IBM XT (Original) ?? IBM portable PC ?? Compaq DeskPro FD ?? PCjr FC ?? IBM AT (6 MHz) 01 IBM AT 3x9 (8 MHz) 02 IBM XT 286 04 IBM PS/2 Model 50 05 IBM PS/2 Model 60 0B IBM PS/1 FB 00 IBM 256/640K XT (aka XT/2) FA 00 IBM PS/2 Model 30 01 IBM PS/2 Model 25 F9 00 IBM PC Convertible F8 00 IBM PS/2 Model 80 (16 MHz) 01 IBM PS/2 Model 80 (20 MHz) 04 IBM PS/2 Model 70 (20 MHz) 09 IBM PS/2 Model 70 (16 MHz) B6 ?? Hewlett Packard 110 9A ?? Compaq Plus 86 XT (BIOS 11/82+) & AT (BIOS 1/84+) (see note) 80 PC & PCjr (see note) 2D ?? Compaq PC - found at memory location F000:FFFE or via INT 15,C0 - model values of 80 & 86 are returned by BIOS versions previous to the PS/2 but after the BIOS dates marked - see INT 15,C0