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RE: [N8VEM-S100:3295] S-100 boards in work - uPD7220

I think we need to do a prototype run on that board first.  While it contains elements of 3 previous boards we did,  it is the first time they are all put together in one place.  Also as a few of us know, we had real problems with that BT478 chip on the VDP board (which itself BTW needs to have another prototype run).


On the 7220 I will help out with the hardware, the thing to remember about the 7220 is you have to do quite a bit of software writing to get it to be of any use.   Is somebody prepared to do that. Because without software that chip/board  is useless.





From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] On Behalf Of David Fry
Sent: Saturday, April 26, 2014 7:40 AM
To: n8vem...@googlegroups.com
Subject: Re: [N8VEM-S100:3295] S-100 boards in work


Hi Ed,


Andrew has uploaded the EDA files for the uPD7220 GDC this afternoon, if you feel inclined to do a production run then put me down for 1 board

just for curiosity value. It might be worth considering a smaller run of 5 to 10 boards as this board has failed to spark sufficient interest for a production run

before. looking a previous forum posts for the uPD7220 GDC it would appear to be a descendant of the ECB uPD7220 graphics board interfaced to the S100 bus and is ripe for testing.





David Fry

On Friday, April 25, 2014 11:19:04 PM UTC+1, Edward Snider wrote:

It does seem like it would be an interesting board for an S100 system.  

With almost all of the work done it would be a shame not to go through to completion.


Unfortunately I don't have enough of a system together to help in testing, but I can chip in a bit

for prototypes.  I'd also be willing to handle the production run if we can get takers for at least

20 boards, if that would be helpful.




On Tuesday, September 24, 2013 1:45:38 AM UTC-5, nekonoko wrote:

Hi Andrew,

I can definitely see chipping in at least some of the cost. I find the uPD7220 GDC interesting as several business class CP/M systems used it for graphics (DEC Rainbow, QX-10 etc.).

Thanks much,


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