INT 16 - Tandy 2000 - KEYBOARD - FLUSH KEYBOARD BUFFER                          
	AH = 04h
Note:	this interrupt is identical to INT 51 on the Tandy 2000
SeeAlso: INT 16/AH=00h,INT 16/AH=02h,INT 16/AH=05h"Tandy 2000"
SeeAlso: INT 51"Tandy 2000"