Multi-plane page mode video memory controller
US4800380A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 1982 |
| Grant date | Jan 24, 1989 |
| Priority date | — |
| Expiry date | Dec 21, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2340/10
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A page mode memory controller for a multi-plane color video display providing three bits/pixel corresponding to three page partitioning in each of sixteen 64K dynamic RAMs is described. The three bits/pixel are routed to a color lookup table to provide a choice of eight colors from a palette of 64 colors. Graphic display information is combined with alphanumeric video information on a pixel-by-pixel basis. The combined graphic/alphanumeric information is then converted from a digital signal to an analog signal. Page mode reads access three color planes for video display cycles using a counter for the two least significant memory column address bits. To create the displayed image, vectors are drawn three times, once at each plane.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.