IBM 5170 Technical Reference page 431

of the digit place with the next lower weight is a positive integer
(the radix). The permissible values of the character in any digit
place range from 0 to one less than the radix.
RAM. Random access memory. Read/write memory.
random access memory (RAM). Read/write memory.
RAS. In the IBM Personal Computer, row address strobe.
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.
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