[Coco] 4 Port MPI PCB artwork (so far)

[Gustavo Ranaur Schoenaker]

+1 (same quastions of ZIpster!)

Good Job!

On Mon, Mar 2, 2015 at 1:37 PM, Zippster <zippster278 at gmail.com> wrote:

> Looks good Jim.  I especially like the indicator LEDs on each slot.
> I would like to get one of these when you’re done.
>
> Thanks for doing this.
>
> Is anyone going to do cases?
>
> - Ed
>
>
> > On Mar 2, 2015, at 3:07 AM, RETRO Innovations wrote:
> >
> > As a stepping stone to the 8 port unit, I thought I'd finish the 4 port
> one that I had started, since the same design is usable for both, just the
> CPLD size has to change.  As of right now, the design:
> >
> > * All data lines routed
> > * All CPLD lines routed except switch select lines
> > * 1.15" spacing btween ports (25mm = 1.00", and I could just not make
> >   that work with the CPLD size.  I hope 1.15" will work
> > * Initial decoupling caps in place, not all routed though.
> > * All power buues are routed
> >
> > To do:
> >
> > * Add 3V3 regulator (have to create a footprint
> > * Check dimensions of portion that goes into Coco (Anyone have a high
> >   res scan of a PCB that has the grounding ears?  I am trying to
> >   follow Gene's measurements, but it's difficult without a pic
> > * Determine cabling option and reroute lines to headers
> > * Add PSU connector(s)
> > * Tie ground planes together at edges.
> > * Add Large electrolytics on each port for power stability
> > * Add standoff mounting holes
> >
> > Lots of minor stuff, but routing was the more complicated, so I focused
> on it first.  I'll probably still move some of the lines around (and the
> LEDs will have to move, as they are right under the carts now), but the
> CPLD lines should be close to final.
> >
> > Without ground pour:  http://s6.postimg.org/a3xvuex6p/PCB2.png
> >
> > With:  http://s6.postimg.org/wz0rx2npd/PCB.png
> >
> > Jim
> >
>
>
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