INT 2C P - Cloaking - TRAP I/O PORTIBM PC Portable (uses same BIOS as XT)
	AX = 002Eh
	DX = port number to trap
Return: CF clear if successful
	CF set on error (port out of range or reserved)
Note:	this function was first introduced with RM386 (RAM-MAN/386) v6.00
SeeAlso: AX=002Fh,AX=0030h