INT 14 - I1541 - LONGWAIT                                                       
	AX = 400Dh
	DX:CX = number of 838ns microticks to wait
	     (0000h:0000h means 4294967296, about one hour)
Example: To wait 1s you must set DX:CX=(1s/838ns)=1193180
SeeAlso: AX=4000h,AX=400Ch