Differences

This shows you the differences between two versions of the page.

--- mcmaster:nec:d7220d [2019/04/19 06:57] – created mcmaster
+++ mcmaster:nec:d7220d [2025/08/04 21:23] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
-{{tag>collection_mcmaster vendor_nec type_unknown year_unknown foundry_unknown}}
+{{tag>collection_mcmaster vendor_nec type_unknown year_1984 foundry_unknown}}
 ====== Package ======
@@ Line 6: / Line 6: @@
 <code>
+NEC JAPAN
+D7220D-1
+E9
 </code>
@@ Line 15: / Line 18: @@
 ====== Die ======
+Copyright:
 <code>
+(C) NEC 1980
+ D7220
 </code>
-[[https://siliconpr0n.org/map/nec/d7220d/mz_mit20x/|mz_mit20x]]
+Label:
+<code>
+GDC
+</code>
+[[https://siliconprawn.org/map/nec/d7220d/mcmaster_mz_mit20x/|mz_mit20x]]
+    * [[https://siliconprawn.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:
+,459,676 - covers the accelerated bresenham curve drawing scheme
+Other patents which probably cover the 7220 are:
+,356,482
+,491,834
+,545,014
+,570,222
-    * [[https://siliconpr0n.org/map/nec/d7220d/single/nec_d7220d_mz_mit20x.jpg|Single]] (15192x14949, 66.97MB)