INT 33,24 - Get Driver Version, Mouse Type & IRQ Number
AX = 24h on return: BH = major version (see below) BL = minor version (see below) CH = mouse type: = 1 bus mouse = 2 serial mouse = 3 InPort mouse = 4 PS/2 mouse = 5 Hewlett Packard mouse CL = IRQ number: = 0 PS/2 = 2 IRQ 2 = 5 IRQ 5 = 7 IRQ 7 - version 6.1 would be represented as BH = 06h, BL = 10h