Important Notice

The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

   ◄Summary►  ◄Notes►  ◄Back►
──────────────────────────────────────────────────────────────────────────────
 
    The user's handler for pointing device data is entered via a far call
    with four parameters on the stack:
      SS:SP+0AH status
      SS:SP+08H x coordinate
      SS:SP+06H y coordinate
      SS:SP+04H z coordinate (always 0)
    The handler must exit via a far return without removing the parameters
    from the stack.
 
    The status parameter passed to the user's handler is interpreted as
    follows:
    Bit(s)     Significance (if set)
    ══════     ══════════════════════════
    0          left button pressed
    1          right button pressed
    2-3        reserved
    4          sign of x data is negative
    5          sign of y data is negative
    6          x data has overflowed
    7          y data has overflowed
    8-15       reserved
                                    -♦-