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

[Brett Gordon]

I'm in!   I would love to try my MPI compatible YA-DOS on a real MPI.
Unfortunately, MPI's are in short supply (maybe I can scrounge one up
at CoCoFest)...  I would definately be interested in buying one!



On Mon, Mar 2, 2015 at 3:20 PM, Gustavo Ranaur Schoenaker
<ranaur at ranaur.net> wrote:
> +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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>> Coco at maltedmedia.com
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>>
>
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-- 
Brett M. Gordon,
beretta42 at gmail.com