(19)
(11) EP 0 482 263 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
26.08.1992 Bulletin 1992/35

(43) Date of publication A2:
29.04.1992 Bulletin 1992/18

(21) Application number: 90313405.4

(22) Date of filing: 10.12.1990
(51) International Patent Classification (IPC)5: G09G 1/16, G09G 5/36
(84) Designated Contracting States:
DE FR GB IT

(30) Priority: 24.10.1990 US 602479

(71) Applicant: ACER INCORPORATED
Lungtan, Taoyuan 32514 (TW)

(72) Inventor:
  • Yu, Chien-Chih
    Lungtan, Taoyuan 32514 (TW)

(74) Representative: Luckhurst, Anthony Henry William et al
MARKS & CLERK, 57-60 Lincoln's Inn Fields
London WC2A 3LS
London WC2A 3LS (GB)


(56) References cited: : 
   
       


    (54) Video memory system with intermediate buffer


    (57) A video memory system is disclosed including a video memory 38, an intermediate buffer 34, a video display control unit (VDUC) 42, and a video processing means 39. The intermediate buffer 34 is disposed between an external CPU 30 and the video memory 38 to intercept the address 31, data 32, and read/write signals 33 from the CPU. For read operations, signals to the video memory 38, and the data read therefrom travel through the buffer 34 to arrive at the CPU 30. For write operations, the intermediate buffer 34 stores the address and data signals from the CPU 30. The data is later written into the video memory 38 in response to a time slot reference signal 52.






    Search report