Connecting External Devices; Installing The Power Supply - TYAN TOMCAT I875PF User Manual

Tomcat i875PF S5105 Chapter 2: Board Installation
2.10 – Connecting External Devices
Connecting external devices to the motherboard is an easy task. The standard devices you
should expect to plug into the motherboard are keyboards, mice, and printer cables. The
following diagram will detail the ATX port stack for the following board:
Tomcat i875PF S5105
More on the uncommon side these days are the Serial Ports. They were primarily used to
connect external modems, but most modems today are using USB or are installed internally.
TIP: While the ports have been created to accept connectors in only one direction, make sure
to be careful when inserting connectors. At times, attaching connectors in the incorrect
orientation can damage, bend and or break the pins.
2.11 – Installing the Power Supply
There are two power connectors on this motherboard. By default, this motherboard requires
that you have an ATX12V power supply that has the standard ATX-style 20-pin connector, as
well as an additional 4-pin square connector. The CPU power is provided by the onboard
switching voltage regulator, which is sourced by +12V power. This +12V CPU power source is
from the onboard 4-pin square connector. The +12V power on the 20-pin ATX power
connector is for system board and separated from CPU +12V regulator power source.
Therefore, the CPU will not be powered if you do not connect the 4-pin square ATX 12V power
connector.
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