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AH = 84h DX = subfunction 0000h read joystick switchesReturn:
AL bits 7-4 = switch settings 0001h read positions of joysticksReturn:
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"
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