Image rotate control circuitry

Details Image rotate control circuitry Image rotate control circuitry

1981-12-04

1984-08-21

Ruggiero, Joseph F.

Boots, shoes, and leggings

364200, G01D 900, G06F 1500

Patent

active

044674481

ABSTRACT:
Image rotate control circuitry buffers one column of display or video data which is subsequently printed along a horizontal print line. A video dot counter cycles each horizontal scan line while a print line counter cycles each vertical scan. Video data is entered into the buffer when the count in the video dot counter equals the count in the print line counter. After one refresh of the display the buffer contains one print line of data. This data is shifted from the buffer to the printer during the vertical retrace or vertical blank period of the display. The control circuitry sends a strobe signal to the printer for the print operation as a new column of data is being buffered during the next refresh of the display.

REFERENCES:
patent: 3918041 (1975-11-01), Mao
patent: 3924225 (1975-12-01), Langnickel
patent: 3976982 (1976-08-01), Eiselen
patent: 4084195 (1978-04-01), Pereira
patent: 4158203 (1979-06-01), Johnson, Jr. et al.
patent: 4287521 (1981-09-01), Hakoyama
patent: 4334231 (1982-06-01), Regehr

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