[Coco] CoCo Altera DE1 interface

Fri Jan 16 11:17:42 EST 2015

Mathew,

Do you still sell them? If not ... no problem, it will be fun to solder
SMD. I'll do it on OSHPark, but, reinforcing the question from Kandur, what
are the capacitors (Cn) on the board?

Thanks!

On Fri, Jan 16, 2015 at 1:33 AM, Matthew Stock <stock at bexkat.com> wrote:

> Hi Gustavo,
>
> Yes, I'm still lurking.  I have used the board pretty extensively for my
> FPGA projects and found it useful.  A few others have used it as well so
> far as I know.  Since it does the level conversion for 3.3v logic and
> follows the same pinout as the Altera boards, you can use a straight ribbon
> cable to connect the two.
>
> Some of my Coco FPGA work is up on Github (http://github.com/mattstock/,
> including a few iterations of a multi-ROM system that was programmable via
> SPI from an Arduino, the start of a microSD-based disk drive replacement
> (that was implemented much more elegantly by Darren well before I finished
> mine), and some other odds and ends.  Feel free to take a look, and let me
> know if I can be of any assistance.
>
> I haven't been working on Coco projects recently though - I've actually
> been working on a new CPU and machine design implemented in an FPGA as a
> fun little experiment.  I've needed to delve into building a cross
> assembler and cross compiler, and doing all three in parallel has been very
> enlightening.  Not Coco, but if you're interested feel free to take a look
> at these and other projects at Github.
>
> I may bring it back around to the Coco at some point, who knows.  :-)
>
> Matt
>
>
>
>
> On Thu, Jan 15, 2015 at 9:31 PM, Gustavo Ranaur Schoenaker <
> ranaur at ranaur.net> wrote:
>
> > Hi
> >
> > While browsing in OSHPark I found two projects: CoCo Buffer (
> > https://oshpark.com/shared_projects/1qtqcHjF) and Slot Extender (
> > https://oshpark.com/shared_projects/ixlqJKlZ).
> >
> > Looking on the old posts of the list I think the first one was made by
> > Mathew. (are you there, Matt? :)
> >
> > Does anyone used it? Is there any project example to connect the Altera
> > FPGA with the CoCo? I would love to try it,
> >
> > On Fri, Oct 31, 2014 at 12:41 PM, Matthew Stock <stock at bexkat.com>
> wrote:
> >
> > > Hi Tim,
> > >
> > > I don't have any on hand, but if you can solder the fine pitch chips
> you
> > > can order them from Digikey and OSHPark directly.  I can order and
> > assemble
> > > them too if you prefer, but it will be more expensive that way.  Send
> me
> > a
> > > note directly if you want to discuss either option: stock at bexkat.com.
> > >
> > > This little buffer interface is useful for non-Altera boards, but the
> > > pinout allows you to take a normal 40-pin ribbon cable and plug it from
> > > Coco to DE1 without any fuss.  It's been really handy for my projects
> and
> > > tinkering.
> > >   -Matt
> > >
> > >
> > > On Fri, Oct 31, 2014 at 10:29 AM, tim at franklinlabs.com <
> > > tim at franklinlabs.com
> > > > wrote:
> > >
> > > > Yeah, at this point it's the LE count. I don't need 1/3 of the I/O.
> I'm
> > > > really
> > > > not sure yet on the LE count either. Just thinking ahead. I haven't
> > > > prototyped
> > > > the design yet but I will using a DE-1. I am planning on using the
> > > Cyclone
> > > > series on the final design.
> > > >
> > > > I need to get in touch with Matt Stock (CoCo e-mail participant). He
> > was
> > > > selling
> > > > a DE-1 interface board at one point. I found his board on OSH Park.
> If
> > > he's
> > > > still around and reading this... Can I still get one or two of those
> > > > boards??????
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > > On October 31, 2014 at 9:09 AM Mark McDougall <
> msmcdoug at iinet.net.au
> > >
> > > > wrote:
> > > > >
> > > > >
> > > > > On 31/10/2014 3:42 AM, tim at franklinlabs.com wrote:
> > > > >
> > > > > > I actually haven't chosen the actual FPGA yet because I'm not
> sure
> > > how
> > > > much
> > > > > > LE
> > > > > > space I need. I was considering a small Cyclone III or
> equivalent.
> > > The
> > > > one I
> > > > > > was
> > > > > > looking at I thought was 264 pins but it actually was 408.
> > > > >
> > > > > Wow, do you *need* that much I/O for your project? Or is it a case
> of
> > > the
> > > > > smallest package for that many LE's?
> > > > >
> > > > > I've done TQFP soldering by hand, but I think that was 144-pin, and
> > > > quite a
> > > > > few years ago before my sight started failing me. It's not as hard
> as
> > > > you'd
> > > > > think as the solder tends to stick to the pin/pad.
> > > > >
> > > > > I've got a homebrew project now with a PQFP 240-pin Cyclone III and
> > I'm
> > > > not
> > > > > going to stuff around with, I'll bite the bullet and get it
> > assembled -
> > > > > probably a run of 8.
> > > > >
> > > > > Regards,
> > > > >
> > > > > --
> > > > > | Mark McDougall | "Electrical Engineers do it
> > > > > | <http://members.iinet.net.au/~msmcdoug> | with less resistance!"
> > > > >
> > > > > --
> > > > > Coco mailing list
> > > > > Coco at maltedmedia.com
> > > > > https://pairlist5.pair.net/mailman/listinfo/coco
> > > > mattstock <https://oshpark.com/profiles/mattstock> .
> > > >
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> > > >
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> > >
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