User`s guide

Chapter 2 - The Mainboard

Mainboard Connectors

Connectors and headers are used to attach devices to the mainboard.

Attached devices can be internal (e.g., hard disk indicator lights), or

external (e.g., serial and parallel ports). The most commonly used

connectors are shown in the Mainboard Diagram. The table below

provides a brief summary.

Connector ID Description

Table 1. - Mainboard Connectors

J1 Keyboard connector

PS1 Main power supply header

PS2 PCI 3.3 volt power supply header

J2 COMA: communications port A (DB9)

J3 COMB: communications port B (DB25)

J4 LPT1: Parallel “printer” port header

J5 Floppy disk drive header

J6 PCI Configuration header

J7 Primary IDE hard drive header (PCI local bus)

J8 Secondary IDE hard drive header (PCI local bus)

J9 10Base2 (BNC) adapter header

J10 10BaseT (RJ45) adapter header

J11 SCSI device header

J13 KBDLOCK: Keyboard Lock input

J14 SPEAKER output, HDD LED output

J15 RESET switch input, Mute LED (not used),

Business Audio Mute (not used)