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A direct access storage device, or DASD, is a secondary storage device in mainframe computers that has low access time for all of its capacity. The term DASD was introduced by IBM to describe disk drives, magnetic drums, and data cells. The direct access capability of those devices was quite different than that of sequential access used in tape drives because it required a substantially long time to access a distant point in a medium. IBM computers access devices through channels, which are...
A control store is the element of a CPUs control unit that stores the CPU's micro program and is usually accessed by a micro sequencer. A control store is usually executed as a diode-selection of read-only memory. This tradition dates back to 1947 when the program timing matrix on the MIT Whirlwind was initially introduced. The earliest models of IBM mainframe had read-only control store; however, the System/370 and successor models were made and loaded their micro programs from floppy disks...
- To swell, as grain or wood with water.
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