Bit mapped memory plane with character attributes for video disp

Details Bit mapped memory plane with character attributes for video disp Bit mapped memory plane with character attributes for video disp

1988-07-28

1991-04-30

Oberley, Alvin E.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340748, 340803, G06F 314

Patent

active

050122320

ABSTRACT:
A video display controller for controlling the display of characters stored in a bit plane memory. The characters to be displayed are arranged in the bit plane memory in a set number of scan lines with a set number of data bits in each scan line. Attribute bits are included in one scan line of data bits in each character to be displayed. The controller includes a data bus for receiving data from the bit memory plane in bytes, each of which includes data bits of one scan line. Each data byte from the data bus is clocked into a shift register, with the data byte shifted out of the shift register sequentially, one bit at a time. Attribute bytes are selected from the data bus and an attribute logic circuit applies the attribute bits to the sequential data bits of a corresponding character to be displayed.

REFERENCES:
patent: 4203102 (1980-05-01), Hydes
patent: 4375638 (1983-03-01), O'Keefe et al.
patent: 4482979 (1984-11-01), May
patent: 4704040 (1937-11-01), Takano et al.
"Compression/Decompression of Fort Patterns", IBM Technical Disclosure Bulletin, vol. 28, No. 8, Jan. 1986, pp. 3563-3564.
Nicholson et al., "Attribute Countroller Display Modification", IBM Technical Disclosure Bulletin, vol. 21, No. 1, Jun. 1978, pp. 295-296.
Mersel, "Highlighting Image data on Pel for Pel Addressable Displays", IBM Technical Disclosure Bulletin, vol. 23, No. 6, Nov. 1980, pp. 2342-2343.
"Alphanumeric Display Buffer", IBM Technical Disclosure Bulletin, vol. 27, No. 10a, Mar. 1985, pp. 5530-5533.

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