Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1987-04-20
1989-03-28
Brigance, Gerald L.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
340799, 340801, G09G 100
Patent
active
048168157
ABSTRACT:
A display memory control system is disclosed which is associated with a display system for displaying and outputting character data, graphic data and the like. In the event of displaying images on a display, a system (host computer) writes one screen of display data in one of two VRAMs. The display data are transferred to the display and to the other VRAM to be stored therein. Upon completion of the storage in the other VRAM, the display data stored therein are read out to appear on the display. To update the display data, the system makes a write access to the one VRAM within a period of time other than one for which the transfer of video data is effected from the one VRAM to the other VRAM. This increases the period of time within which the one VRAM is accessible by the system and, thereby, enhances high speed data processing and display of high resolution images on the display with a desirable quality.
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Brigance Gerald L.
Fatahi-Yar Mahmound
Ricoh & Company, Ltd.
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