Int 15/AH=84h

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BIOS - JOYSTICK SUPPORT (XT after 1982/11/8,AT,XT286,PS)

AH = 84h
DX = subfunction
0000h read joystick switches

Return:
AL bits 7-4 = switch settings 0001h read positions of joysticks

Return:
AX = X position of joystick A BX = Y position of joystick A CX = X position of joystick B DX = Y position of joystick B

Return:
CF set on error AH = status (see #00496) CF clear if successful

Notes: If no game port is installed, subfunction 0000h returns AL=00h (all switches open) and subfunction 0001h returns AX=BX=CX=DX=0000h. A 250kOhm joystick typically returns 0000h-01A0h

See Also: AH=84h"V20-XT-BIOS"

Category: Bios - Int 15h - B

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