AUTOMATIC DATA CHANNELS FOR A COMPUTER SYSTEM
 Inventors: Angus McLagan, Newport Beach;
Gei-Jon Pao, Garden Grove; Chong
S. Un, Anaheim, all of Calif.; John J.
Pearce, Jr., Del Valle, Tex.
 Assignee: David Computer Corporation, Irvine, Calif.
 Appl. No.: 397,645
 Filed: Aug. 21,1989
Related U.S. Application Data
 Continuation of Ser. No. 088,617, Aug. 20, 1987, abandoned.
 Int. Cl.= G06F 9/00; G06F 9/22
 U.S. CI 364/200; 364/262.4;
 Field of Search 364/200, 364/900
 References Cited
U.S. PATENT DOCUMENTS
3,688,274 8/1972 Cormier et al 364/200
3,771,136 11/1973 Heneghan et al 364/200
4,148,098 4/1979 McCreight et al 364/200
4,410,941 10/1983 Barrow et al 364/200
4,439,829 3/1984 Tsiang 364/200
OTHER PUBLICATIONS "Naked Mini 16, Engineering Specification", Computer
Automation, Inc., document No. 00-98017-00, Apr. 14, 1971.
"Declaration of David H. Methvin".
Primary Examiner—Gary V. Harkcom
Assistant Examiner—Michael A. Jaffe
Attorney, Agent, or Firm—Knobbe, Martens, Olson &
A data communications system for a computer for transferring data between the memory of the computer and one or more peripheral devices without requiring an interrupt context switch. The data communications system includes a number of specialized registers in the central processing unit of a computer, a computer memory, a data storage location associated with one or more peripheral devices, and a bus connecting the data storage location to the memory. The specialized registers in the central processing unit are dedicated exclusively to processing data transfers between the memory and the data storage location associated with the peripheral devices. Data transfers between the computer memory and the data storage location associated with the peripheral devices are made under the control of the central processing unit with the use of the special registers without the execution of an interrupt context switch.
21 Claims, 12 Drawing Sheets