INT 14 - ARTICOM - DETACH ASYNCHRONOUS RESOURCE                                 
	AX = 8005h
	DX = port to detach (COM1=0, COM2=1, ...)
Return: AX = error code, if error (see #00360)
Note:	only a previously attached resource can be detached
SeeAlso: AX=8000h,AX=8003h,AX=8004h