64 bit wide video front cache

Computer graphics processing and selective visual display system – Computer graphic processing system


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345193, 345195, 345467, 395110, G09G 522




A VGA compatible graphics controller receives character data, attribute data and font data, each of which are stored in different planes of a display memory. The font data comprises bit maps of at least two character fonts, which may be user fonts or default fonts loaded from a controller BIOS. The video controller detects attempts by a host CPU to write data into plane two of display memory (where character font bit maps reside). The address generated by the host CPU is scrambled to produce a video font cache address. The character font bit maps are stored in a video font cache at the scrambled address. The font select bits of the CPU generated address are used as a byte select to store a particular font at a byte location at a selected video font cache address. In the preferred embodiment, eight fonts may be stored in the video font cache, one scan line each font of each character as a different byte at each address of the video font cache in a 64 bit wide DRAM.

patent: 4345244 (1982-08-01), Greer et al.
patent: 4486856 (1984-12-01), Heckel et al.
patent: 4587629 (1986-05-01), Dill et al.
patent: 4847758 (1989-07-01), Olson et al.
patent: 4849747 (1989-07-01), Ogawa et al.
patent: 4868554 (1989-09-01), Aoki et al.
patent: 4937565 (1990-06-01), Suwannukul
patent: 5043712 (1991-08-01), Kihara et al.
patent: 5159676 (1992-10-01), Wicklund et al.
patent: 5208908 (1993-05-01), Harrison et al.
patent: 5243703 (1993-09-01), Farmwald et al.
patent: 5265236 (1993-11-01), Mehring et al.
patent: 5539428 (1996-07-01), Bril et al.


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