{{tag>collection_mcmaster vendor_nec type_unknown year_1984 foundry_unknown}}
====== Package ======
{{:mcmaster:nec:d7220d:pack_top.jpg?300|}}
NEC JAPAN
D7220D-1
8442E9
{{:mcmaster:nec:d7220d:pack_btm.jpg?300|}}
====== Die ======
Copyright:
(C) NEC 1980
D7220
Label:
GDC
[[https://siliconpr0n.org/map/nec/d7220d/mcmaster_mz_mit20x/|mz_mit20x]]
* [[https://siliconpr0n.org/map/nec/d7220d/single/nec_d7220d_mcmaster_mz_mit20x.jpg|Single]] (15192x14949, 66.97MB)
====== Additional Information ======
The uPD7220 was designed by Tetsuji Oguchi, and information and schematics for the 7220 and 7220A can be found on his website: http://oguchi-rd.com/LSI%20products.php
The schematics are at http://oguchi-rd.com/schematics/logic/7220A/7220A%20Schematics.pdf
The patents for certain covering the the 7220 are:
4,459,676 - covers the accelerated bresenham curve drawing scheme
Other patents which probably cover the 7220 are:
4,356,482
4,491,834
4,545,014
4,570,222