Re: [N8VEM-S100:3433] S-100 boards in work - uPD7220

[Todd Goodman <t...@bonedaddy.net>]

Hi David,

I'm not Andrew, but I've ordered boards from PCBcart before and I think
the quality is very good.

The biggest drawback is the extra time (they do well checking the board
files and if they have any questions it's about a day per question due
to the time difference.)  Also, they're 8 or 12 day lead time and then
the shipping time from China to the US (though that's quicker than you
might expect.)

From my point of view it comes down to how quickly we want the boards.
The gold fingers and chamfer are a bonus as well.

Todd

* David Fry <dgf...@googlemail.com> [140501 06:49]:
> Andrew,
>  
> Would you consider the boards from PCBcart as good a quality as those from 
> www.4pcb.com (taking the gold finders out of the comparison),
>  
> Dave, Fabio
> I'm happy to go with the consensus on this one, I just want a reliable 
> prototype board.
>  
> Andrew
> btw Would it be possible for you to upload the KiCad files for the S100 
> buffered prototype board, thanks
>  
> regards
>  
> David Fry
> On Saturday, April 26, 2014 5:56:07 PM UTC+1, monahanz wrote:
> 
> >  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.
> >
> >  
> >
> > John
> >
> >  
> >
> >  
> >
> > *From:* n8ve...@googlegroups.com <javascript:> [mailto:
> > n8ve...@googlegroups.com <javascript:>] *On Behalf Of *David Fry
> > *Sent:* Saturday, April 26, 2014 7:40 AM
> > *To:* n8ve...@googlegroups.com <javascript:>
> > *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.
> >  
> >  
> >  
> >
> > https://groups.google.com/forum/#!searchin/n8vem-s100/upd7220/n8vem-s100/KNTuzzAdKbU/XIY-yZTK4dUJ
> >  
> >  
> >  
> > Regards
> >  
> >  
> >  
> > 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.
> >  
> >  
> >  
> > Ed
> >  
> >  
> >  
> >
> > 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, 
> >
> > Pete 
> >
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