Programmable video display character control circuit using multi-purpose RAM for display attributes, character generator, and refresh memory
US4595996A · kind A · utility
17Cited by
11References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 25, 1983 |
| Grant date | Jun 17, 1986 |
| Priority date | — |
| Expiry date | Apr 25, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G5/222
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A video display control circuit, for an intelligent terminal, includes a large cost efficient Random-Access Memory (RAM). A portion of the RAM memory is utilized as a high speed character generator instead of employing a dedicated Read Only Memory (ROM). Novel timing and memory control circuits are provided which permit characters to be generated witout any delay or change of real character timing. The characters in RAM may be modified or changed which is not possible with dedicated Read Only Memories.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.