Raster scan video display system

G - Physics – 09 – G

Patent

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375/32

G09G 1/16 (2006.01) G09G 5/22 (2006.01) G09G 5/26 (2006.01)

Patent

CA 1239715

ABSTRACT OF THE DISCLOSURE A displaying apparatus uses a raster scanning type display such as a CRT, wherein vertical and horizontal positions are addressed respectively by an address counter for displaying. A start address is set in a vertical address counter and a horizontal address counter, which are later incremented by a carry from an adder corresponding thereto. The adder for the vertical address repeats adding operations a predetermined addend data four times in one horizontal blanking period and twice in one vertical blanking period. The adder for the horizontal address repeats adding operations the predetermined addend data at short time intervals. By setting the addend data properly, display sizes of characters or pictures on a screen of the CRT can be enlarged or reduced with respect to their original sizes. Moreover, if the start address and addend data described above are renewed at every horizontal line, characters or pictures in various angles in accordance with a perspective can be displayed.

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