Easily upgradeable video memory system and method

Details Easily upgradeable video memory system and method Easily upgradeable video memory system and method

1988-11-28

1990-03-06

Groody, James J.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

358 81, H04N 146

Patent

active

049069853

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.

REFERENCES:
patent: 4608596 (1986-08-01), Williams et al.
patent: 4769632 (1988-09-01), Work et al.
patent: 4837710 (1989-06-01), Zelinsky et al.

Affiliated with

Also associated with

Rating

Easily upgradeable video memory system and method does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Easily upgradeable video memory system and method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Easily upgradeable video memory system and method will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-50053