INT 33,3 - Get Mouse Position and Button Status

AX = 03

on return:

CX = horizontal (X) position (0..639)

DX = vertical (Y) position (0..199)

BX = button status:

¦F-8¦7¦6¦5¦4¦3¦2¦1¦0¦ Button Status

¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ +---- left button (1 = pressed)

¦ ¦ ¦ ¦ ¦ ¦ ¦ +----- right button (1 = pressed)

+------------------- unused

- values returned in CX, DX are the same regardless of video mode