IBM 5170 Technical Reference page 412

represents one of the non-negative integers smaller than the radix.
For example, in decimal notation, a digit is one of the characters 0
to 9.
digital. (1) Pertaining to data in the form of digits. (2) Contrast
with analog.
DIN. Deutsche Industrie Norm.
DIN connector. One of the connectors specified by the DIN
committee.
DIP. Dual in-line package.
DIP switch. One of a set of small switches mounted in a dual
in-line package.
direct current (dc). A current that always flows in one direction.
direct memory access (DMA). A method of transferring data
between main storage and 110 devices that does not require
processor intervention.
disable. To stop the operation of a circuit or device.
disabled. Pertaining to a state of a processing unit that prevents
the occurrence of certain types of interruptions. Synonymous with
masked.
disk. Loosely, a magnetic disk unit.
disk drive. A mechanism for moving a disk pack and controlling
its movements.
disk pack. A removable assembly of magnetic disks.
diskette. A thin, flexible magnetic disk and a semirigid protective
jacket, in which the disk is permanently enclosed. Synonymous
with flexible disk.
Glossary-tO