N8VEM VDU board

Andrew Lynch lynchaj at yahoo.com
Mon Oct 19 19:46:08 CDT 2009


http://classiccmp.org/pipermail/cctalk/2009-October/277991.html 

 


N8VEM VDU board


ROBO5.8 robo58 at optonline.net
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Sun Oct 18 19:33:00 CDT 2009 

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  _____  

Hi Andrew,
 
Did you continue your work with the NEC uPD7220 GDC?  If so can you tell us
where you are with that project?
 
Thanks Robo
 
 
  _____  

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-----REPLY-----

 

Hi Robo!  Thanks!  I am continuing work on the N8VEM S-100 projects.
Currently I am working with some other people on S-100 related projects.  I
recently made a PCB manufacturing order for a group buy of N8VEM S-100
prototyping boards.  With the larger quantity, I was able to reduce the cost
per board to $18 down from $25 each originally.

The next project is a joint project with another builder to make a different
S-100 board (TBA) but not the uPD7220 board.  I am still seeking basic
information on the uPD7220 GDC and there is very little available.  If you
know where the uPD7220 User Manual and/or Design Guide are (paper or
scanned), I would certainly appreciate some help in getting the information.
I have the datasheet and some simple stuff gleaned from the web but that is
insufficient information to design a full blown S-100 board from scratch.  I
am looking for some sample circuits to help with design and prototyping.
Dan Roganti has (I think) a copy of the User Manual and is scanning it which
should be available eventually.  I can tell you with confidence after
designing and prototyping the N8VEM VDU board, which was largely based on an
already existing design, that video boards are complicated devices.

Presently, I am working to build up the S-100 design skill set.  Making
S-100 boards is quite different than the ECB Eurocard designs I have done
for the N8VEM project.  Hopefully the third N8VEM S-100 board will be out
soon and we can move on to more complex projects.  I consider the uPD7220
design probably to be one of the more complicated designs so it will be a
later project.  I would like to do some simple boards like one each for
parallel, serial, SRAM, RTC, etc.  Maybe a debug board would be good
depending on what is available.  Eventually more complicated designs like a
CPU board and/or graphics board.

Given my skill set, available time, and tools the selection of projects is
rather limited.  Thanks and have a nice day!

Andrew Lynch

 




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