Cursor control circuit

Published:2011/4/27 9:45:00 Author:Nicole | Keyword: cursor control circuit | From:SeekIC

This circuit uses software to control cursor, then the cursor can be writen at any place of display screen, it is not limited by the form of from above to below or from left to right. TVII system contains 8K bits BASIC and 32 usable ASCII control codes, but only 18 codes are used. Three 7445 BCD code changes into BCD decoder work as the way of 3 lines change into 8 lines, the (12) is used as chip start-up line. When the (12) is low level, there must be a output turning into low level.



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