◄Summary► ◄Up► ◄Contents► ◄Index► ◄Back► ──────────────────────────────────────────────────────────────────────────── The format of the system configuration table is as follows: Bytes Contents 00h-01h Length of table in bytes 02h System model 03h System submodel 04h BIOS revision level 05h Configuration flags Bits Significance (if set) 7 DMA channel 3 used 6 Slave 8259 present (cascaded IRQ2) 5 Real-time clock available 4 Keyboard intercept (Int 15h Function 4Fh) available 3 Wait for External Event is available 2 Extended BIOS data area allocated 1 Micro Channel implemented 0 Reserved 06h-09h Reserved The system model and type bytes are assigned as follows: Machine Model Byte Submodel Byte PC FFh ── PC/XT (11/08/82 BIOS) FEh ── PCjr FDh ── PC/AT (6/10/85 BIOS) FCh 00h PC/AT (11/15/85 BIOS) FCh 01h PC/XT-286 FCh 02h PS/2 Model 50[Z] FCh 04h PS/2 Model 60 FCh 05h PC/XT (1/10/86 & 5/9/86 BIOS) FBh 00h PS/2 Model 30 FAh 00h PC Convertible F9h 00h PS/2 Model 80 (16MHz) F8h 00h PS/2 Model 80 (20MHz) F8h 01h PS/2 Model 70 (20MHz) F8h 04h PS/2 Model 70 (16MHz) F8h 09h PS/2 Model 55 F8h 0Ch PS/2 Model 70 (25MHz) F8h 0Dh These bytes should be used with care, as they do not reflect alternate processor cards (such as Microsoft MACH 20). -♦-