Jcom1: Serial Port Connector; Jlpt1: Parallel Port Connector - MSI PC Mate series Handbuch

JCOM1: Serial Port Connector

This connector is a 16550A high speed communication port that sends/receives 16
bytes FIFOs. You can attach a serial device.
JAUD1: Front Panel Audio Connector
This connector allows you to connect the front audio panel located on your computer
case.

JLPT1: Parallel Port Connector

This connector is used to connect an optional parallel port bracket. The parallel port
is a standard printer port that supports Enhanced Parallel Port (EPP) and Extended
Capabilities Parallel Port (ECP) mode.
En-22