Through this port devices can send and receive data in a series. There are typically two serial ports on a microcomputer, and only one device may use a serial port at any time. Printers and other devices that require faster data communication often plug into parallel ports. Parallel ports communicate in a similar fashion to serial ports but instead of a single communication line they have a parallel set of wires over which information can be sent and received simultaneously. A serial port, by contrast, can only send or receive information at any given time, thus forcing the computer and peripheral to alternate sending information to each other.
SCSI ports are extremely fast and versatile.
They can handle multiple devices concurrently, hooked up in a chain. SCSI ports come in various sizes and shapes. The computer's main circuit board is called the mother board. It is a fiberglass and copper board on which reside the processing components and other various components. The mother board does not always contain specific components to carry out specialized tasks, however it allows you to add these components by providing receptacles or slots into which you can plug expansion cards .