[Coco] Mission Accomplished!

[Boisy G. Pitre]

Steve,

It sure was challenging to assemble!  Mark recommended that we go with a big ground plane for electrical stability with vias going through at various points.  We did that, and it did make assembling more challenging.  However, subsequent runs will be solder masked, so that won't be an issue.

The current dimensions of the board are 6.3cm(w) x  9.7cm(h). However, 4.2cm of the 9.7cm height is just wasted board with the lettering on it.  We had to use that dimension as per the board manufacturer we went with for these prototypes.  My guess is that we can shrink the subsequent board even more on the width since we're optimizing the support logic into a single chip.  Just a guess, but we can probably get away with hacking off a cm, so I would think 5.3cm(w) x 5.5cm(h) would be a good target.

Best Regards,
Boisy G. Pitre

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On Mar 2, 2012, at 7:11 AM, Steven Hirsch wrote:

> On Thu, 1 Mar 2012, Boisy G. Pitre wrote:
> 
> Boisy,
> 
> I wonder if the huge ground plane might not be overkill, especially if it complicates assembly.
> 
> But, hey, nice work.  Do you have a dimensional diagram of the board?  I'd like to figure out how many slots I'll lose in an Apple IIe (will be at least two).  Alternately, maybe I could get away with a short ribbon cable between the motherboard and the adapter.  Experience with the various Apple IIgs accelerators suggests that 2-3" of ribbon cable might actually work (the GS clocks at 3Mhz., so there'd be even more margin with a 1Mhz. 2e).
> 
> Steve
> 
> 
> -- 
> 
> 
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