NEC uPD7220/GDC Design Manual - test-drb@ccmp.vtda.org

18 Jun 2009

remember the APC had the ability to pan on a larger virtual "scree". The native
resolution was 640 x 400/or 480. The virtual screen was like twice that (at least). That
might be the reason for the complexity. 
 I've seen much less dense boards based on the 7220.
 JOOC, where are you getting these 7220s from? 

--- On Wed, 6/17/09, Peter C. Wallace <pcw at mesanet.com> wrote:

...
  From: Peter C. Wallace <pcw at mesanet.com>
 Subject: RE:NEC uPD7220/GDC Design Manual
 To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at
classiccmp.org>
 Date: Wednesday, June 17, 2009, 9:45 PM
 On Wed, 17 Jun 2009, Andrew Lynch
 wrote:

  Date: Wed, 17 Jun 2009 21:37:04 -0400
 From: Andrew Lynch <lynchaj at yahoo.com>
 Reply-To: "General Discussion: On-Topic and Off-Topic  Posts"
      <cctalk at classiccmp.org>
 To: cctalk at classiccmp.org
 Subject: RE:NEC uPD7220/GDC Design Manual

 --- On Wed, 6/10/09, Andrew Lynch wrote:
 interested in selling it?  I contacted NEC and  they didn't know anything
  about it.  Apparently very few people still have
 the manual and bitsavers
  doesn't have it either.  I did some library
 searches but no luck although it
  is cited as a reference in a couple of college
papers  like masters thesis,
  etc.

 What I really need to know is if I can implement a  simple circuit using few
  enough 74LS TTL ICs to fit on a Eurocard ECB
 board.  That means it can't be
  more than about 30 maximum.  Using high capacity
 SRAMs should help but I
  think it requires some funky latching mechanisms
to  share the video address
  and data lines.

 I looked at the NEC APC video board and it is just  huge.  I hope that is not
  an indication of the complexity needed!

 Thanks and have a nice day!

 Andrew Lynch

 Probably 30 would do, I have in front of me a S100 card
 with a 7220. 128KB of 
 64 Kb DRAM and 31 TTL ICs...

 Peter Wallace
 Mesa Electronics

 (\__/)
 (='.'=) This is Bunny. Copy and paste bunny into your
 (")_(") signature to help him gain world domination.