{{tag>collection_mcmaster vendor_nec type_unknown year_1984 foundry_unknown}}

====== Package ======

{{:mcmaster:nec:d7220d:pack_top.jpg?300|}}

<code>
NEC JAPAN
D7220D-1
 8442E9
</code>

{{:mcmaster:nec:d7220d:pack_btm.jpg?300|}}

<code>
</code>

====== Die ======

Copyright:
<code>
(C) NEC 1980
 D7220
</code>

Label:
<code>
GDC
</code>

[[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