INT 33,0 - Mouse Reset/Get Mouse Installed Flag

AX = 00

on return:

AX = 0000 mouse driver not installed

FFFF mouse driver installed

BX = number of buttons

- resets mouse to default driver values:

. mouse is positioned to screen center

. mouse cursor is reset and hidden

. no interrupts are enabled (mask = 0)

. double speed threshold set to 64 mickeys per second

. horizontal mickey to pixel ratio (8 to 8)

. vertical mickey to pixel ratio (16 to 8)

. max width and height are set to maximum for video mode