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Copyright 1991 David Jurgens |
INT 33,18 - Set alternate subroutine call mask and address
AX = 18h
DX = offset to function
CX = user interrupt mask:
│F-8│7│6│5│4│3│2│1│0│ user interrupt mask in CX
│ │ │ │ │ │ │ │ └─── alt key pressed during event
│ │ │ │ │ │ │ └──── ctrl key pressed during event
│ │ │ │ │ │ └───── shift key pressed during event
│ │ │ │ │ └────── right button up event
│ │ │ │ └─────── right button down event
│ │ │ └──────── left button up event
│ │ └───────── left button down event
│ └────────── cursor moved
└──────────── unused
- entire mask is set to zero when INT 33,0 is called
- up to three handlers may be defined with this call
- mask should be cleared before program exit
- when handler is called it receives parameters in the following
registers:
AX = condition mask causing call
CX = horizontal cursor position
DX = vertical cursor position
DI = horizontal counts
SI = vertical counts
DS = mouse driver data segment
BX = button state:
│F-2│1│0│
│ │ └─── left button (1 = pressed)
│ └──── right button (1 = pressed)
└────── unused
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| Esc or Alt-X to exit |
int 33,18 |
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