[Coco] CocoFlash Updates

[Zippster]

No apologies needed Jim.

I don’t think we should be too concerned with stepping on each other’s toes with these projects,
as there’s probably enough time at the soldering station available for everyone.  Who wants to
spend every waking moment assembling boards?  :)

I had only a very small run of 20 or so planned on the Orch90 board anyway, and the more
new hardware that’s out there, the better for the community.

Anyway, looks nice!  :D

- Ed


> On Sep 12, 2016, at 12:25 PM, RETRO Innovations <go4retro at go4retro.com> wrote:
> 
> http://www.go4retro.com/projects/cocoflash/
> 
> 
> With apologies to Zippster, but in July or so, Barry asked if I could squeeze the Orchestra 90 functionality into the CocoFlash, so folks could assume some additional sound options for games and such.
> 
> This Summer was hectic, but I was able to do so, and the conversation in the list around the circuitry was very enlightening.  The Orch90 functionality analog section is the top right of the cart, the R2R ladders are most prominent.  I used discrete resistors since I helped with layout and I could get the wattage rating I wanted more easily and more cheaply.
> 
> In any event, the (hopefully) finished cart design is shown above.  (The wire is due to a trace issue caused by some debugging efforts).  I have verified the sound waveform matches the OR90 output, but has a but more Vp-p, since I opted for some newer ABT-family latches, which drive to the rails a bit better.
> 
> When I get some time, I'll put some more information on the design on the web page, but feel free to ask questions if desired.
> 
> Jim
> 
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