[Coco] MPI 2D rendering

[RETRO Innovations]

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