发明名称 |
Programmable video display character control circuit using multi-purpose RAM for display attributes, character generator, and refresh memory |
摘要 |
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.
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申请公布号 |
US4595996(A) |
申请公布日期 |
1986.06.17 |
申请号 |
US19830488484 |
申请日期 |
1983.04.25 |
申请人 |
SPERRY CORPORATION |
发明人 |
MORLEY, KENNETH S.;WIEDENMAN, GREGORY B.;WHITE, JAMES K. |
分类号 |
G06F3/153;G09G1/02;G09G5/00;G09G5/18;G09G5/22;(IPC1-7):G06F3/153;G06F13/00 |
主分类号 |
G06F3/153 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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