USB NeXT keyboard doesn't fit?
Moderators: adafruit_support_bill, adafruit

USB NeXT keyboard doesn't fit?

by jasper on Tue Jan 08, 2013 1:06 pm

Hi,

After reading this tutorial (http://learn.adafruit.com/usb-next-keyb ... ino-micro/), I purchased all the needed parts from the webshop; however, I'm having a really hard time to connect my keyboard to the supplied mini-DIN6 adapter. While it does look like it ought to fit, I'd rather not force it too much and possible bend a leg inside the keyboard connector.
When I compare the received DIN6 adapter with my keyboard's connector, it seems that the ground and power pins of the adapter are leveled with the black pin in the center, which is not the case with the DIN5 adapter that's used in the pictures.

Any idea where I can get a working adapter from?

Thanks for the awesome project...I hope I can reproduce it here soon :)
jasper
 
Posts: 5
Joined: Sat Aug 21, 2010 4:31 am

Re: USB NeXT keyboard doesn't fit?

by adafruit_support_mike on Tue Jan 08, 2013 7:06 pm

Can you post an end-on photo of your connector, ideally next to a ruler so it's easier to estimate sizes and pin spacing? There are lots of different connectors in the wild, and having rough dimensions will make it easier to narrow a search.
When you void a product warranty, you give up your right to sue the manufacturer if something goes wrong and accept full responsibility for whatever happens next. And then you truly own the product.
User avatar
adafruit_support_mike
 
Posts: 10777
Joined: Thu Feb 11, 2010 2:51 pm

Re: USB NeXT keyboard doesn't fit?

by jasper on Wed Jan 09, 2013 3:23 pm

Hi,

Here's a picture of my connector; the issue is with the two upper pins.

Image

What I'm wondering is how come Lady Ada uses the exact right connector in her article/tutorial, but recommends using a connector from the Adafruit store which doesn't fit :(
jasper
 
Posts: 5
Joined: Sat Aug 21, 2010 4:31 am

Re: USB NeXT keyboard doesn't fit?

by adafruit_support_mike on Thu Jan 10, 2013 9:08 pm

It's possible that NeXT used different connectors at different times. They were very cutting-edge machines for their day, and the company spent most of its life in 'startup' mode.

*great* photo BTW.. I'll poke around through some of the usual suppliers (Mouser and Digikey) and see if I can find anything that matches.
When you void a product warranty, you give up your right to sue the manufacturer if something goes wrong and accept full responsibility for whatever happens next. And then you truly own the product.
User avatar
adafruit_support_mike
 
Posts: 10777
Joined: Thu Feb 11, 2010 2:51 pm

Re: USB NeXT keyboard doesn't fit?

by jasper on Sun Jan 13, 2013 4:38 pm

Thanks.

I'd also be very interested where Lady Ada got the connector from which she used in the tutorial..
jasper
 
Posts: 5
Joined: Sat Aug 21, 2010 4:31 am

Re: USB NeXT keyboard doesn't fit?

by adafruit_support_mike on Thu Jan 17, 2013 8:16 pm

Okay.. I finally found a datasheet that illustrates the issue: http://www.mouser.com/ds/2/222/KMDAX-xS-20587.pdf

There are eight basic pin locations for mini-DIN sockets, and you just leave out the pins you don't need for a given connector. The center key is the problem: it is indeed in different locations for the 5-pin and 6-pin variants.

From a design perspective that makes sense.. you use keys to prevent misalignment and just-plain-wrong connections. The side-lugs and shroud (that stairstep thing on the end of the male connector) prevent misalignment, but the key keeps people from plugging a lower-pin-count male connector into a higher-pin-count female connector. Usually that kind of thing is Bad.

In your case, there are a couple of options:

First - you can make the keyhole on the 6-pin connector larger. From your photo, it looks like the key in your connector is sloped on the side closest to center, so a little grinding with a Dremel or X-Acto knife will give you the clearance you need. Frankly, you could probably drill out the whole center without causing any trouble.. just leave some plastic between the edge of the hole and the pin sockets.

Second - you could get a female mini-DIN-5 connector. Here's a link to a list of options: http://www.mouser.com/Connectors/Circul ... ricing%7C0 That would cost you a few more dollars and add some delay though.

Third - you could cut the key out of your keyboard connector. I include that more for completeness than as an actual suggestion, because while I have no problem hacking up hardware, I get all sentimental about *vintage* hardware. My old Apple ][ is more of a pet than a project opportunity. ;-)

It does look like linking to a 6-pin adapter without checking for compatability was an oversight on the Adafruit crew's part though. I'll flag this post and let them know there's an issue.
When you void a product warranty, you give up your right to sue the manufacturer if something goes wrong and accept full responsibility for whatever happens next. And then you truly own the product.
User avatar
adafruit_support_mike
 
Posts: 10777
Joined: Thu Feb 11, 2010 2:51 pm

Re: USB NeXT keyboard doesn't fit?

by jasper on Fri Jan 18, 2013 10:19 am

Hi,

Thanks a lot for digging into this; I went for option 1 and got the connector fitting.
Now on to the next part of the project :)
jasper
 
Posts: 5
Joined: Sat Aug 21, 2010 4:31 am

Re: USB NeXT keyboard doesn't fit?

by adafruit on Thu Jan 31, 2013 7:31 pm

http://www.digikey.com/scripts/dksearch ... MD-50PL100 is the right part, tutorial fixed! There was some confusion, they all look the same ;)
User avatar
adafruit
 
Posts: 11740
Joined: Thu Apr 06, 2006 4:21 pm
Location: nyc