Boots – shoes – and leggings
Patent
1987-05-11
1989-09-12
Zache, Raulfe B.
Boots, shoes, and leggings
364231, 3642372, 3642373, 3642383, G06F 314
Patent
active
048666009
ABSTRACT:
Video control circuitry for controlling the video format presented to the cathode ray tube or screen and capable of providing a combination of character generation and cell generation along with other video types of control. The video controller may comprise a video memory means for controlling writing into and reading therefrom and means defining both a memory address and a memory data. There is a video data bus coupled to the video memory means and a processor address bus. A cathode ray tube controller has address lines and the address lines are connected to multiplexer means for selecting either the controller address lines or the processor lines. Control means are provided for controlling the multiplexer means so that in one state thereof the video memory means is addressed from the cathode ray tube controller means and in the other state the video memory means is addressed from the central processing unit address. This occurs on an interleaved basis with the CRT clock basically operating at the normal refresh cycle rate. However, in accordance with the invention the CRT clock is essentially divided so that one half of the clock cycle is used for communication from the CPU to the video memory means. This provides for improved screen display.
REFERENCES:
patent: 3648250 (1972-03-01), Low et al.
patent: 4150429 (1979-04-01), Ying
patent: 4156904 (1979-05-01), Minowa et al.
patent: 4203107 (1980-05-01), Lovercheck
patent: 4500956 (1985-02-01), Leininger
patent: 4694392 (1987-09-01), Ballard et al.
Ballard Jerry L.
Chatham Dale
Gaulke Gerald E.
Tandy Corporation
Zache Raulfe B.
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