[Coco] [Color Computer] Re: USB Anyone?

[j_e_daggett]

The CPLD is programed via a jtag interface and the software to design
and program is free. 

I can see your point to have a blank board and a either a bag of parts
and simple solder skills. Or buy a blank board and go find the parts
yourself. Actually you will be surprised what "hobbiest" con do today .

james




--- In ColorComputer at yahoogroups.com, "James Diffendaffer"
<jdiffendaffer at y...> wrote:
> 
> I was more interested in designing something that wouldn't require a
> device programmer or surface mount components.  Easy for a hobbyist.
> 
> I'm pretty sure I can squeeze it in a standard ROM pack.  I can always
> use a jumper wire or two to keep it on a 2 layer board... but I don't
> think I'll need it.
> 
> 
> 
> --- In ColorComputer at yahoogroups.com, "j_e_daggett" <j_e_daggett at y...>
> wrote:
> > 
> > James
> > 
> >  The Xilinx XCR3032XL-10VQC44C is a 32 macrocell CPLD that is in a 44
> > VQFP package and commercial temperature grade. It has 10 nS pin to pin
> > delay and is $1.70 unit price from Xilinx online store. Also can be
> > Avnet has them for $1.87 unit price.
> > 
> > By the time you scrounge and find a 74LS30, 74LS00s, and 74LS04s, you
> > are going to have near a buck invested already. Even if y ou went
> > surface mou nted you are not going to get the circuit in as small a
> > board as I  have now. 
> > 
> > I have traded component cost for reduce PCB cost. The smaller the
> > actual  board the cheaper your PCB cost will be. 
> > 
> > james 
> >





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