G - Physics – 09 – G
Patent
G - Physics
09
G
354/230.86
G09G 5/36 (2006.01) G06F 12/00 (2006.01) G09G 5/02 (2006.01) G09G 5/395 (2006.01)
Patent
CA 1314331
ABSTRACT A video memory system is disclosed in which the memory module used to store video data also generates a selection signal that indicates whether the module is a monochrome or color memory module. Memory control logic generates a pixel clock which governs the rate at which pixels of data are output to a monitor, and a load clock which determines the rate at which data is read from the memory module. The load clock is generated at a first rate when the selection signal denotes a monochrome memory module, and at a second, faster rate when the selection signal denotes a color memory module. A shift register receives video data from the video memory module at the rate of the load clock, and outputs that data at the pixel clock rate. The shift register outputs a plurality of bits of the video data in parallel to a video signal generator, which converts the received data into a video signal. To upgrade the video memory system in the preferred embodiment from a monochrome system to a color system, a monochrome memory module is replaced with a color memory module. Alternatively, an upgrade can be effected by adding memory to the memory module and changing the mode selection signal from monochrome to color mode. A-49227/GSW
604517
Digital Equipment Corporation
Furlong Thomas C.
Smart & Biggar
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