[Coco] MPI 2D rendering

[Michael Brant]

Jim, you may have answered this question before regarding your MPI design
and you have my apologies. Will your MPI be compatible with all the CoCo 1,
2, and 3? Thanks

On Sat, Mar 28, 2015 at 7:46 PM, Gene Heskett <gheskett at wdtv.com> wrote:

>
>
> On Saturday 28 March 2015 16:41:11 RETRO Innovations wrote:
> > On 3/28/2015 2:38 PM, Bill Pierce via Coco wrote:
> > > Jim, it looks really good. simple and to the point.
> > > I ave 2 questions...
> > > 1. What's the max length on the ribbon cable between the cart and
> > > the board?
> >
> > Don't know.  I assume if the length is OK for ATA-6 IDE cables, it's
> > OK for this.  80 conductor cable required (in my opinion).  40 will
> > not have enough cross talk protection.
> >
> > > 2. Is there any particular reason for the wide spacng between cart
> > > slots? I would think slightly closer spcing would reduce board
> > > costs.
> >
> > Spacing was dictated by need to fit 64 pin TQFP package in between and
> > space for standoffs (the base config would have nylon standoffs, which
> > protrude above the PCB).  CoCo uses .961" opening size, and my spacing
> > is 1.15", so .25" extra.  Someone with an MPI can check, but I believe
> > it uses .2" spacing to allow the small bands of metal/plastic to
> > separate slots.
> >
> > Jim
>
> I am measuring .25" on the later MPI here Jim, and 4.33" for the width of
> the opening.  The cart separating & guiding dividers inside the lid go
> nearly to the PCB itself. Pretty well designed actually.  Spring loaded
> flaps to cover the opening when no cart is inserted.
>
> Cheers, Gene Heskett
> --
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