INT 16 - OPTIMA 1024 VGA-Sync - QUERY ZOOM INTERRUPT
AH = FFh
Return: AL = interrupt number to which BIOS keyboard handler has been relocated
AL+1 = Zoom interrupt number
BX = hotkey
Note:   The default interrupts are 60h for keyboard and 61h for Zoom interrupt;
the default hot key is F10

See also: 60

16FF - OPTIMA 1024 VGA-Sync - QUERY ZOOM INTERRUPT