INT 11 - BIOS - GET EQUIPMENT LIST
Return: AX = BIOS equipment list word
bits
0     floppy disk(s) installed (see bits 6-7)
1     80x87 coprocessor installed
2,3   number of 16K banks of RAM on motherboard (PC only)
number of 64K banks of RAM on motherboard (XT only)
2     pointing device installed (PS)
3     unused (PS)
4-5   initial video mode
00 EGA, VGA, or PGA
01 40x25 color
10 80x25 color
11 80x25 monochrome
6-7   number of floppies installed less 1 (if bit 0 set)
8     DMA support installed (PCjr, some Tandy 1000s, 1400LT)
9-11  number of serial ports installed
12    game port installed
13    serial printer attached (PCjr)
internal modem installed (PC/Convertible)
14-15 number of parallel ports installed
---Compaq and many other 386/486 machines--
EAX bit 23: page tables set so that Weitek coprocessor addressable in
real mode
bit 24: Weitek math coprocessor present
---Compaq Systempro
EAX bit 25: internal DMA parallel port available
26: IRQ for internal DMA parallel port (if bit 25 set)
0 = IRQ5
1 = IRQ7
27,28: parallel port DMA channel
00 DMA channel 0
01 DMA channel 0 ???
10 reserved
11 DMA channel 3

See also: 12

11 - BIOS - GET EQUIPMENT LIST