(19)
(11) EP 0 525 986 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
21.07.1993 Bulletin 1993/29

(43) Date of publication A2:
03.02.1993 Bulletin 1993/05

(21) Application number: 92305993.5

(22) Date of filing: 29.06.1992
(51) International Patent Classification (IPC)5: G09G 1/16, G09G 5/36
(84) Designated Contracting States:
DE FR GB IT NL

(30) Priority: 26.07.1991 US 736686

(71) Applicant: SUN MICROSYSTEMS, INC.
Mountain View, CA 94043 (US)

(72) Inventors:
  • Priem, Curtis
    Fremont, California 94536 (US)
  • McIntyre, Bruce
    Cupertino, California 95014 (US)
  • Malachowsky, Chris
    Santa Clara, California 95051 (US)
  • Moffat, Guy
    Palo Alto, California 94306 (US)

(74) Representative: Wombwell, Francis 
Potts, Kerr & Co. 15, Hamilton Square
Birkenhead Merseyside L41 6BR
Birkenhead Merseyside L41 6BR (GB)


(56) References cited: : 
   
       


    (54) Apparatus for fast copying between frame buffers in a double buffered output display system


    (57) An output display system including a first frame buffer; a second frame buffer; apparatus for transferring data from the second frame buffer to an output display device; apparatus for controlling the transfer of data to each of the frame buffers, this last-mentioned apparatus including apparatus for writing new data only to the first frame buffer, and apparatus for both reading data from the first frame buffer and writing the data to the second frame buffer during the same operation.






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