US PATENT SUBCLASS 710 / 22
.~ Direct Memory Accessing (DMA)

Current as of: June, 1999
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710 /   HD   ELECTRICAL COMPUTERS AND DIGITAL DATA PROCESSING SYSTEMS: INPUT/OUTPUT

1  DF  INPUT/OUTPUT DATA PROCESSING {16}
22.~ Direct Memory Accessing (DMA) {6}
23  DF  .~.~> Programmed control memory accessing
24  DF  .~.~> By command chaining
25  DF  .~.~> Timing
26  DF  .~.~> Using addressing
27  DF  .~.~> Via separate bus
28  DF  .~.~> With access regulating

DEFINITION

Classification: 710/22

Direct Memory Accessing (DMA):

(under subclass 1) Subject matter further comprising means or steps for transferring data between a peripheral and memory of a digital data processing system or computer with minimal or no intervention from a main processor of the digital data processing system or computer.

(1) Note. Direct Memory Accessing (DMA) appears here for its classical treatment as an I/O operation as opposed to a memory accessing and control operation per se. Memory accessing and control are classified elsewhere. See the SEE OR SEARCH CLASS notes below.

(2) Note. Transferring data "directly" between memories of different digital data processing system or computers is classified elsewhere. See the SEE OR SEARCH CLASS notes below.

SEE OR SEARCH CLASS

360, Dynamic Magnetic Information Storage or Retrieval, appropriate subclasses for record carriers and systems wherein information is stored and retrieved by interaction with a medium and there is relative motion between a medium and a transducer, for example, magnetic disk drive devices and control thereof, per se.

709, Electrical Computers and Digital Data Processing Systems: Multiple Computer and Process Coordinating,

212, for computer-to-computer direct memory accessing.

711, Electrical Computers and Digital Processing Systems: Memory, 100+, for memory accessing and controlling, per se.