Advanced Inf Installer Error Unregistering The Ocx. Serial HOWTO: Locating the Serial Port: IO address, IRQs If you need to find a serial port it often helps if you know what bus it's on. If the serial port is on a card, you may know what bus the card inserts into such as a PCI slot. But if the serial port is built into the motherboard it may not be clear what bus it's on. For old motherboards that have ISA bus slots, it's likely on the ISA bus and may not even be Plug-and-Play. But even if all your slots are PCI, the serial port is likely to be on either an ISA bus or LPC bus (also called a 'LPC interface'). LPC is common on laptop computers.
HOWTO: Identifying which process is using the serial port. The Zetafax server will fail to open the serial port if another process is attached to the serial port. I am trying to figure out who's locking my COM port. Tried to search but could not find a way to figure that out. I am using XP. Was wondering if 'Process Explorer. The Serial Port - Software Setup. I shall walk you through the process of setting up a serial port and hyperterminal on a computer running windows XP.