Bits 2—3 of the returned value are used only in the ROM BIOS for the original IBM PC with the 64 KB system board and on the PCjr.Obtains the equipment list code word from the ROM BIOS.
Call with:
Nothing
Returns:
AX = equipment list code word
Bit(s) Significance
0 = 1 if floppy disk drive(s) installed
1 = 1 if math coprocessor installed
2 = 1 if pointing device installed (PS/2)
2—3 system board ram size (PC, see Note)
00 = 16 KB
01 = 32 KB
10 = 48 KB
11 = 64 KB
4—5 initial video mode
00 reserved
01 40-by-25 color text
10 80-by-25 color text
11 80-by-25 monochrome
6—7 number of floppy disk drives (if bit 0 =
1)
00 = 1
01 = 2
10 = 3
11 = 4
8 reserved
9—11 number of RS-232 ports installed
12 = 1 if game adapter installed
13 = 1 if internal modem installed (PC and XT
only)
= 1 if serial printer attached (PCjr)
14—15 number of printers installed
Note:
Bits 2—3 of the returned value are used only in the ROM BIOS for the original IBM PC with the 64 KB system board and on the PCjr.