IBM 5170 Technical Reference page 432

retry. To resend the current block of data (from the last EOB or
ETB) a prescribed number of times, or until it is entered correctly
or accepted.
reverse video. A form of highlighting a character, field, or cursor
by reversing the color of the character, field, or cursor with its
background; for example, changing a red character on a black
r "
background to a black character on a red background.
RF. Radio frequency.
RF modulator. The device used to convert the composite video
signal to the antenna level input of a home TV.
RGBI. Red-green-blue-intensity.
rising edge. Synonym for positive-going edge.
ROM. Read-only memory.
ROM/BIOS. The ROM resident basic input/output system,
which provides the level control of the major I/O devices in the
computer system.
row address strobe (RAS). A signal that latches the row address in
a memory chip.
RS-232C. A standard by the EIA for communication between
computers and external equipment.
RTS. Request to send. Associated with modem control.
run. A single continuous performance of a computer program or
routine.
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