[Coco] Proto CoCo
gene.heskett at verizon.net
Mon Aug 28 13:21:36 EDT 2006
On Monday 28 August 2006 12:31, jdaggett at gate.net wrote:
>I have come across a vendor that will do PCBs 2 sided with solder mask
> and silk screen for reasonable price. Requirements that the boards need
> to be less than or equal to 20 square inches and minimum order is 5.
>It would not take long to design a 4x5 card with the COCO 40 pin PCB
> pattern with a bunch of holes and/or pads for smt parts. Could do either
> or both.
>I would say that a 4x5 card with holes for breadboarding along with
> busses for +5VDC, +12VDC, -12VDC and ground would be in the $25 to $35
> range. Hardest part is to route the board for the connector to fit in to
> the MPI or expansion slot. Having a PCB house do that would increase
> board cost significantly. Also gold contacts also increase costs.
I can do the routing on my cnc micromill. That shouldn't be more than 30
lines of gcode to hand carve a working approximation of that edge profile.
But I'm also partial to having the address decodeing and buffered bus stuff
all present and accounted for. Ditto OC buffers for all the IRQ related
stuff so we don't see the IRQ's blinking the video slightly since there's
way too many pullups using way too low R's in the average lashup.
>On 28 Aug 2006 at 10:46, Gene Heskett wrote:
>> That might be a good idea Mark, all us wannabe design engineers would
>> have to have a couple of those just to play with if the price was
>> reasonable. (there I go again, thinking like a retired old fart on SS,
>> which I am these days) Throw out a price & we'll see if its
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Yahoo.com and AOL/TW attorneys please note, additions to the above
message by Gene Heskett are:
Copyright 2006 by Maurice Eugene Heskett, all rights reserved.
More information about the Coco