1.7. Input and Peripheral Devices
A virtually unlimited number of types of input devices can be connected to a PC. In addition to the standard keyboard and mouse, there are bar-code readers, digital cameras, microphones, biometric devices, touch screens, and a plethora of others. Many today connect through the USB or FireWire port, using instructions from the vendor. However, you must know about other types of connections for the A+ exam.
1.7.1. Critical Information
Keyboard connectors allow for the direct connection of the keyboard to the motherboard. There are essentially three types of keyboard connectors: AT, PS/2, and USB.
AT connectors are round, about 1½″ in diameter, and have five sockets in the DIN-5 configuration. They're found on ...