Date: Fri, 20 Jun 2008 08:14:06 -0600
From: "maurice smulders"
Make sure you google for uPD7220 (that's the NEC
prefix)
You can also look for the Intel 82720, which is the Intel-packaged
version of the same chip. Both are on the web and the text for the
datasheets and programming manual is essentially identical.
Cheers,
Chuck