IBM XT 5160 Technical Reference page 400

raster. In computer graphics, a predetermined pattern of lines
that provides uniform coverage of a display space.
read. To acquire or interpret data from a storage device, from a
data medium, or from another source.
read-only memory (ROM). A storage device whose contents
cannot be modified. The memory is retained when power is
removed.
read/write memory. A storage device whose contents can be
modified. Also called RAM.
recoverable error. An error condition that allows continued
execution of a program.
red-green-blue-intensity (RGBI). The description of a
direct-drive color monitor that accepts input signals of red, green,
blue, and intensity.
redundancy check. A check that depends on extra characters
attached to data for the detection of errors. See cyclic redundancy
check.
register. (1) A storage device, having a specified storage
capacity such as a bit, a byte, or a computer word, and usually
intended for a special purpose. (2) A storage device in which
specific data is stored.
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
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.
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