Table 1

m1  Description
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0   Resets mouse, number of buttons returned in m2; status returned in m1
    (0 indicates mouse not installed, -1 if OK)

1   Enable mouse cursor

2   Disable mouse cursor

3   Returns button status and cursor coordinates (m3 = horizontal,
    m4 = vertical

4   Set mouse cursor (m3= horizontal, m4 = vertical) screen address

5   Returns button press information (set m2 = 0 for left button, 1 for right.
    Number of presses are returned in m2; m3 and m4 have right cursor
    position)

6   Same as (5), but gets information when button is RELEASED

7   Limits range of cursor's horizontal movement

8   Limits range of cursor's vertical movement