Quantcast

IBM Reference Libraries

Page 1 of about 2 Articles
2010-09-07 17:51:13

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...

2010-09-02 14:56:06

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;...

Word of the Day
barratry
  • The offense of persistently instigating lawsuits, typically groundless ones.
  • An unlawful breach of duty on the part of a ship's master or crew resulting in injury to the ship's owner.
  • Sale or purchase of positions in church or state.
This word ultimately comes from the Old French word 'barater,' to cheat.
Related