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Chapter 5 Ports and Connectors
Chapter 5
Parallel Connector
The 25-pin connector is used to connect an external parallel port. The parallel port connects
your PC to a parallel printer. It supports SPP, ECP and EPP.
SPP
(Standard Parallel Port)
Allows normal speed operation but in one
direction only.
ECP
(Extended Capabilities Port)
Allows parallel port to operate in bidirectional
mode and at a speed faster than the SPP’s data
transfer rate.
EPP
(Enhanced Parallel Port)
Allows bidirectional parallel port operation at
maximum speed.
Parallel
2
1
26
25
I/O Connectors
Power Connector
Use a power supply that complies with the ATX12V Power Supply Design Guide Version 1.1.
An ATX12V power supply unit has a standard 4-pin ATX main power connector that must be
inserted into the 4-pin connector.
The power connector from the power supply unit are designed to fit the 4-pin connector in
only one orientation. Make sure to find the proper orientation before plugging the connectors.
Important:
Insufficient power supplied to the system may result in instability or the add-in boards
and peripherals not functioning properly. Calculating the system’s approximate power
usage is important to ensure that the power supply meets the system’s consumption
requirements.
1
2
+12V
Ground
+12V
Ground
3
4
+12V
Power
