Display apparatus having variable text row formating

Details Display apparatus having variable text row formating Display apparatus having variable text row formating

1977-11-25

1979-05-22

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

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

340789, 340723, G06F 314

Patent

active

041562380

ABSTRACT:
A circuit is described for selectively increasing the number of text rows on the display screen of a CRT. The number of scan lines in each text row is reduced by one in response to a display format selection signal. The scan lines so saved are utilized to form two additional text rows. A variable modulus scan line counter is used in combination with a decoder to provide the scan line counter modulus desired. Additionally, a text row counter is used in combination with a second decoder to selectively change the modulus of the text row counter to correspond with the selected modulus of the scan line counter. A compressed display is provided by simultaneously changing the modulus of both the scan line and text row counters.

REFERENCES:
patent: 3423749 (1969-01-01), Newcomb
patent: 3500470 (1970-03-01), Barker et al.
patent: 3582946 (1971-06-01), Mita et al.
patent: 3868673 (1975-02-01), Mau, Jr. et al.
patent: 4019090 (1977-04-01), Wolff et al.

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