INT 2F - PRINDIR v9.0 - SET FLUSH DELAY                                         
	AX = 7F0Ah
	DX = number of clock ticks before flushing
Return: AX = status
	    0000h successful
SeeAlso: AX=7F00h"PRINDIR",AX=7F07h"PRINDIR",AX=7F09h,AX=7F0Bh,AX=7F0Ch