Raster-scanned cathode ray tube display with cross-hair cursor

Details Raster-scanned cathode ray tube display with cross-hair cursor Raster-scanned cathode ray tube display with cross-hair cursor

1984-08-13

1989-05-23

Caldwell, Sr., John W.

Communications: electrical

Land vehicle alarms or indicators

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

340706, G09G 116, G06F 3153

Patent

active

048334626

ABSTRACT:
A raster-scanned interlaced cathode ray tube display is refreshed from a bit buffer (1). Cursor control logic (17) compares the refresh address (3, 4) with a desired cursor address and generates cursor defining bit patterns in synchronism with the bit pattern derived from the bit buffer (1). The cursor control logic (17) also generates overlay information (25) to control the mixing of the bit streams in mixers (11, 12, 13) to produce a 2 or 3-pel wide cross-hair cursor on the CRT screen. The cursor lines can be black, white or transparent. The overlay signal may also be used to control a further optional mixer combining the composite cursor bit-buffer bit patterns with bit patterns derived from a coded character buffer containing coded alphanumeric characters to be displayed.

REFERENCES:
patent: Re31200 (1983-04-01), Sukonick et al.
patent: 4190934 (1980-02-01), Doornink
patent: 4215414 (1980-07-01), Huelsman
patent: 4308532 (1981-12-01), Murphy
patent: 4354184 (1982-10-01), Woborschil
patent: 4354186 (1982-10-01), Groothuis
patent: 4454507 (1984-06-01), Srinivasan et al.
patent: 4521774 (1985-06-01), Murphy
patent: 4625202 (1986-11-01), Richmond et al.
IBM Technical Disclosure Bulletin, vol. 23, No. 6, Nov. 1980, pp. 2342-2343, D. R. Mersel, "Highlighting Image Data on Pel for Pel Addressable Displays. "
IBM Technical Disclosure Bulletin, vol. 19, No. 6, Nov. 1976, pp. 1996-1997, G. W. Brock et al., "Cursors for Use In Digital Displays."
IBM Technical Disclosure, "Cursor-Character Position Synchronization", Nicholson et al., vol. 20, No. 5, Oct. 1977, Cl. 340-709.
IBM Technical Disclosure, "Smooth Travel of Crosshair Cursor", Hawes, vol. 26, No. 2, Jul. 1983, Cl. 340-709.

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