INT 2F - AD-DOS - SET MINUTES TO WAIT
AX = 0C03h
BX = minutes to wait before blanking screen
CF set
Return: n/a???
Notes:  AD-DOS is the DOS version of the After Dark screen blanker
AH=0Ch is the default multiplex number

See also: 2F0C04

2F0C03 - AD-DOS - SET MINUTES TO WAIT