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

[Zippster]

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
>