INT 15 - SYSTEM - POINTING DEVICE BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware. The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly. INTERFACE (PSIBM PS/2, any model) - SET RESOLUTION AX = C203h BH = resolution (see #00523) Return: CF set on error AH = status (see #00522) (Table 00523) Values for pointing device resolution: 00h one count per mm 01h two counts per mm 02h four counts per mm 03h eight counts per mm