R O M

Read Only Memory. Memory that can only be read and cannot be modified. ROM retains its contents even when you turn off the computer by using power from a backup battery.

Root directory

The main directory in a hierarchical disk directory structure. All other directories are subdirectories of the root directory.

RS-232C

A standard type of serial communication. You can connect an RS-232C device to either of the computer’s RS-232C serial ports.

Serial

The type of communication that transmits data from a serial interface to a serial device over a single wire. See also Interface and Parallel.

Shadow RAM

The feature in your computer that copies the contents of the system, video, and external BIOS ROMs into the RAM area of memory to speed up processing.

S I M M

See Memo ry module.

Subdirectory

In a hierarchical disk directory structure, a group of files in a directory within another directory or the root directory.

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