Motorola MVME2400 manual Random-Access Memory. The temporary memory that a computer

G L O S S A R Y

	Glossary
RAM	Random-Access Memory. The temporary memory that a computer
	uses to hold the instructions and data currently being worked with.
	All data in RAM is lost when the computer is turned off.
RAS	Row Address Strobe. A clock signal used in dynamic RAMs to
	control the input of the row addresses.
Raven	The PowerPC-to-PCI local bus bridge chip developed by Motorola
	for the MVME2600 and MVME3600 series of boards. It provides
	the necessary interface between the PowerPC 60x bus and the PCI
	bus, and acts as interrupt controller.
Reduced-Instruction-Set Computer (RISC)
	A computer in which the processor’s instruction set is limited to
	constant-length instructions that can usually be executed in a single
	clock cycle.
RFI	Radio Frequency Interference
RGB	The three separate color signals: Red, Green, and Blue. Used with
	color displays, an interface that uses these three color signals as
	opposed to an interface used with a monochrome display that
	requires only a single signal. Both digital and analog RGB interfaces
	exist.
RISC	See Reduced Instruction Set Computer (RISC).
ROM	Read-Only Memory
RTC	Real-Time Clock
SBC	Single Board Computer
SCSI	Small Computer Systems Interface. An industry-standard high-
	speed interface primarily used for secondary storage. SCSI-1
	provides up to 5 Mbps data transfer.
SCSI-2 (Fast/Wide)	An improvement over plain SCSI; and includes command queuing.
	Fast SCSI provides 10 Mbps data transfer on an 8-bit bus. Wide
	SCSI provides up to 40 Mbps data transfer on a 16- or 32-bit bus.
serial port	A connector that can exchange data with an I/O device one bit at a
	time. It may operate synchronously or asynchronously, and may
	include start bits, stop bits, and/or parity.
SIM	Serial Interface Module

GL-10 Computer Group Literature Center Web Site