INT 33,C - Set Mouse User Defined Subroutine and Input Mask

AX = 0C

ES:DX = far pointer to user interrupt

CX = user interrupt mask:

¦F-5¦4¦3¦2¦1¦0¦ user interrupt mask in CX

¦ ¦ ¦ ¦ ¦ +--- cursor position changed

¦ ¦ ¦ ¦ +---- left button pressed

¦ ¦ ¦ +----- left button released

¦ ¦ +------ right button pressed

¦ +------- right button released

+--------- unused

returns nothing

- routine at ES:DX is called if an event occurs and the

corresponding bit specified in user mask is set

- routine at ES:DX 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

- initial call mask and user routine should be restore on exit

from user program

- user program may need to set DS to it's own segment

- see ~INT 33,14~