The ROM-BIOS (Read Only Memory - Basic Input Output System) chip is a special chip held on your computer's system (mother) board. It contains software that is required to make your computer work with your operating system, for instance it is responsible for copying your operating system into RAM when you switch on your computer
The serial port is a socket located at the back of your computer that enables you to connect items to the computer, such as a modem. They are commonly labeled as COM1 or COM2
The parallel port is a socket located at the back of your computer that enables you to connect items to the computer, such as a printer. It is commonly labeled as LPT1 or LPT2.
Universal Serial Bus (USB)
The Universal Serial Bus is a relatively new item within the PC. You will see one or more USB sockets at the back of the system unit, allowing you to plug in devices designed for the USB. These devices include scanners and digital cameras
What are input devices?
Input devices allow you to input information to the computer and include things such as the keyboard and mouse.
What are output devices?
Output devices allow you to output information from the computer and include the printer and the monitor.
What is a peripheral device?
A peripheral device is any device that you can attach to your computer. Thus, you could attach a scanner or modem to the back of your system unit.