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mcmaster:nec:d7220d [2019/04/19 06:57] mcmaster created |
mcmaster:nec:d7220d [2021/05/28 02:34] 127.0.0.1 external edit |
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====== Package ====== | ====== Package ====== | ||
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* [[https:// | * [[https:// | ||
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+ | ====== Additional Information ====== | ||
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+ | The uPD7220 was designed by Tetsuji Oguchi, and information and schematics for the 7220 and 7220A can be found on his website: http:// | ||
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+ | The schematics are at http:// | ||
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+ | The patents for certain covering the the 7220 are: | ||
+ | 4,459,676 - covers the accelerated bresenham curve drawing scheme | ||
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+ | Other patents which probably cover the 7220 are: | ||
+ | 4,356,482 | ||
+ | 4,491,834 | ||
+ | 4,545,014 | ||
+ | 4,570,222 | ||
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