... by the user. A CPU can read and retrieve the instructions and data from the ROM chip, but it cannot change the contents in ROM. Information on the ROM chip is only for the computer to use. When you turn on a computer, messages are made possible by the information in ROM. The programs on a ROM chip are called firmware, this includes: (a) a wordprocessor ; (b) the operating system or the part of the operating system needed to start up the computer; utility programs, including anti-virus programs and disk management programs. Variations to ROM: PROM- The PROM chip is left blank by the manufacturers and written to by the customer. Once written to the chip it becomes read only memory. Once the instructions are written on the PROM chip by the customer it cannot be changed. EPROM- EPROM is a reusable Prom chip that can be erased by a ultraviolet light. ...

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