[Coco] new mylars

[Boisy G. Pitre]

At Cloud-9, we looked into this. There are really two options:

Option 1. A scan of the original mylar sheet, cleaning up in Photoshop, then having it duplicated on mylar with conductive ink.
Option 2. Relayout the entire keyboard mylar with Eagle or a similar tool, let the autorouter figure out the placement of the traces, and then submit gerbers. This seems to be a more durable and flexible option.

In both cases, care must be taken to get the size exactly right. The additional gotchas are the screw holes which must exactly align in the proper places when the mylar is folded.

There’s also the plastic sheet insert that goes between the folded mylar. It also has specific holes for allowing the key contacts to go through as well as the screw holes.

Also there must be a rigid plastic piece glued onto the tail that is inserted into the 16 pin connector on the motherboard.

All in all, to get it right would be very tedious.

In the end, we came to the conclusion that the minimum order quantity that would be required along with the effort to properly duplicate the keyboard mylar (option 2 above) would be considerable when weighed against the availability of things like the PS/2 keyboard interface.
—
Boisy G. Pitre
CoCo Projects Coordinator
http://www.cloud9tech.com <http://www.cloud9tech.com/>
http://www.nitros9.org <http://www.nitros9.org/>
http://sourceforge.net/projects/drivewireserver/ <http://sourceforge.net/projects/drivewireserver/>
http://sourceforge.net/projects <http://sourceforge.net/projects/drivewireserver/>/toolshed
http://liber809.blogspot.com <http://http//liber809.blogspot.com>
http://github.com/boisy/DriveWire-MacServer

> On Aug 11, 2015, at 10:04 AM, Brian Blake <random.rodder at gmail.com> wrote:
> 
> 
> I think price will be the deciding factor for all of us. I'd like to have a dozen or so mylar sets, but, we'll see what Josh's contact can get us. I'm not convinced yet that this can be done unless we have several hundred sets ordered.
> 
> I've sent Josh pics of the mylar, some with a tape measure to give idea of the size of the mylar pieces. Hopefully w can get some good news.
> 
> 
> Brian
> 
> 
> On 8/11/2015 10:45 AM, tonym wrote:
>>> ---- Original Message ----
>>> From: "Josh Harper via Coco" <coco at maltedmedia.com>
>>> Sent: 8/10/2015 11:45:51 PM
>>> To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
>>> Cc: "Josh Harper" <allencoco at yahoo.com>
>>> Subject: [Coco] new mylars
>>> 
>>> hi guys
>>> is there anyone who has a coco 3 mylar that thet  could take pics of the front ,back and coonector area for me and send them to  me asap
>>> the rep wants to see pics before I send samples
>>> thanks guys
>>> 
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>>> Coco mailing list
>>> Coco at maltedmedia.com
>>> https://pairlist5.pair.net/mailman/listinfo/coco
>>> 
>>> 
>> As the rest of said... price depending.
>> However, I'd be interested in 3-4pcs.
>> 
> 
> 
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