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Chapter 2 Product Overview
MightyBoard 821 Reference Manual 9
Connector and Header Definitions
Table 2-2 describes the connectors and headers shown in Figure 2-4. All I/O connectors and headers use
2.54mm (0.1") pin spacing (pitch) unless otherwise indicated.
Table 2-2. Connector and Header Descriptions
Jack # Signal Description
BT1 Battery 2-pin, 1.25mm external battery connector
DIMM1 DDR2 Memory 1 240-pin socket for DDR2 RAM DIMM
DIMM2 DDR2 Memory 2 240-pin socket for DDR2 RAM DIMM
J1 A/B Keyboard/Mouse 6-pin standard PS/2 connectors for keyboard (purple) and mouse
(green)
J2 ATX PWR In 20-pin, 4.2mm for ATX power in connector
J3 Serial 1 (COM1) 9-pin, 2.77mm connector for serial port 1 (COM1)
J4 Parallel 25-pin connector for printer port (LPT 1)
J5 Video (CRT) 15-pin connector for output to a CRT type monitor
J6 Serial 2 (COM2) 10-pin, 2.0mm header for serial port 2 (COM2)
JP6 Ethernet External
LED
8-pin header for Ethernet activity signals on external LEDs
J7 Infrared (IrDA) 5-pin header for Infrared (IrDA)
J8 GPIO 10-pin, 2.0mm header for general purpose I/O
J9 Video (LVDS) 30-pin, 2.0mm header for LVDS type video displays
J10 DNP Do not populate
J11A Ethernet 1
(LAN1)
8-pin RJ45 connector on Gigabit Ethernet port 1
J11B/C USB 0 & 1 8-pin USB jack provides USB0 and USB1 ports
J12 CPU Fan 3-pin header for fan, +12V, tachometer, ground
J13A Ethernet 2
(LAN2)
8-pin RJ45 connector on Gigabit Ethernet port 2
J13B/C USB 2 & 3 8-pin USB jack provides USB2 and USB3 ports
J14 Audio In/Out 14-pin jack for 3.5 mm MIC In, Line Out, Line In connectors
J15 Serial 3 & 4 20-pin, 2.0mm header for serial ports 3 and 4 (COM3 & COM4)
J16 PCI Express 164-pin, 2.0mm slot for PCI Express
J17 Utility 16-pin connector for PWR LED, IDE activity LED, Power switch,
reset switch, PC speaker (Beep)
J18 IDE 40-pin header for the IDE interface
J19 SATA 1 7-pin Serial ATA connector
J20 SATA 0 7-pin Serial ATA connector
J21 USB 4 & 5 10-pin, 2.0mm header for USB4 and USB5 ports
J22 System Fan 3-pin header for fan, +12V, tachometer, ground