INT 14 - Alloy MW386 v2+ - GET PORT NUMBER FROM LOGICAL PORT ID
        AH = 23h
        AL = logical port (01h COM1, 02h COM2)
        DH = user ID
        DL = process ID (DH,DL both FFh for current task)
Return: AL = MW386 port mode (see below)
        CX = MW386 port number
        DH = owner's user ID
        DL = owner's task ID
SeeAlso: AH=20h"Alloy",INT 17/AH=8Bh"Alloy"

Bitfields for MW386 port mode:
 bit 0  port is shared (spooler only)
 bit 1  port is spooled instead of direct (spooler only)
 bit 2  port is assigned as logical COM device, not in spooler
 bit 3  port is free

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