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2.25 – Connecting External Devices
Connecting external devices to the motherboard is simple. Common external devices are
keyboards, mice, and printer cables. The following diagram will detail the ATX port stack for this
motherboard:
S2707 Trinity GC-SL
Optional 32-bit PCI 1Gbit Ethernet Port (Intel 82540EM)
Depending on the individual motherboard design, the PS/2 keyboard and mouse ports may
sometimes have their positions swapped. The most common designs implemented today place
the keyboard connector closest to the motherboard, while the top connector is for the mouse.
Although primarily to connect printers, the parallel printer port is also used for devices such as ZIP
drives, external CD-RW drives, scanners, and other external devices. Serial ports, also known as
COM ports, are primarily used to connect external modems and other RS-232C devices.
