INT 2F - AD-DOS - SET MINUTES TO WAIT

	AX = C003h
	BX = minutes to wait before blanking screen
Return: AL = 00h if successful
Program: AD-DOS is the DOS version of the After Dark screen blanker for
	  MS Windows
Range:	AH=C0h to AH=FFh, selected by scanning for first free multiplex number
Note:	this call also resets the delay timer
SeeAlso: AX=C000h"AD-DOS",AX=C004h
Index:	screen saver;AD-DOS