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Author Topic: Replacing a non-removable cable on a Model M  (Read 4749 times)

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Offline rowdy

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Replacing a non-removable cable on a Model M
« on: Mon, 08 July 2013, 21:03:51 »
I have recently acquired two Model M keyboards.

One has (had) a non-removable cable which someone has thoughtfully snipped about 5cm out from the case.

I found this link:

http://www.vogons.org/viewtopic.php?t=32544&sid=c34571ca613148056265507e7edc871b

which details the steps someone took to replace such a cable.

Does that process seem reasonable?

Looks like he used a standard PS/2 cable, of which I have a few.  Is that a good idea, or is there a more IBMish cable that would suit better?

He also recommended putting ferrite beads on the cable - is that also recommended?  If so, where?  Just one at the keyboard end (inside the case, as he did)?

Thanks.
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Offline dorkvader

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Re: Replacing a non-removable cable on a Model M
« Reply #1 on: Mon, 08 July 2013, 21:19:33 »
The ferrite beads act as inductors and help to cancel out any unwanted ripples or spikes. Were you in the US I'd mail you a couple, but you can sometimes find them pretty cheap. Any PS/2 cable should work, but you might want to try a beige one to look nicer.

What I would do is drop a teensy in there, and put soarer's code on it, then run a USB cable out. Up to you of course.

Ferrite beads (I believe) can go anywhere on the cable, but it's usually more useful to have them near on end.

One issue I have run into with a cable swap (that you may or may not) is ending up with a hole in the keyboard where the cable comes out. You may want to look into a cable gland to provide some strain relief and help fill up the hole a little.
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Offline rowdy

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Re: Replacing a non-removable cable on a Model M
« Reply #2 on: Mon, 08 July 2013, 21:27:16 »
I can get the beads locally, something like this is sufficiently cheap: http://www.jaycar.com.au/productView.asp?ID=LO1238

As for the USB mods, that would be ideal (still waiting for that PS/2 to USB adaptor ...) but I don't even know if the keyboards work at this stage.

I have lots of old robber dome keyboards of various colours, so I can salvage a cable from there just to see if it works.

As for the hole, a small grommet of some description should suffice.  Something like this: http://www.jaycar.com.au/productView.asp?ID=HP0718
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"Because keyboards are accessories to PC makers, they focus on minimizing the manufacturing costs. But that’s incorrect. It’s in HHKB’s slogan, but when America’s cowboys were in the middle of a trip and their horse died, they would leave the horse there. But even if they were in the middle of a desert, they would take their saddle with them. The horse was a consumable good, but the saddle was an interface that their bodies had gotten used to. In the same vein, PCs are consumable goods, while keyboards are important interfaces." - Eiiti Wada

NEC APC-H4100E | Ducky DK9008 Shine MX blue LED red | Ducky DK9008 Shine MX blue LED green | Link 900243-08 | CM QFR MX black | KeyCool 87 white MX reds | HHKB 2 Pro | Model M 02-Mar-1993 | Model M 29-Nov-1995 | CM Trigger (broken) | CM QFS MX green | Ducky DK9087 Shine 3 TKL Yellow Edition MX black | Lexmark SSK 21-Apr-1994 | IBM SSK 13-Oct-1987 | CODE TKL MX clear | Model M 122 01-Jun-1988

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Offline 0100010

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Re: Replacing a non-removable cable on a Model M
« Reply #3 on: Mon, 08 July 2013, 23:30:47 »
The cable on my Unicomp (PS2, "non removeable") looks like this :

http://www.clickykeyboards.com/index.cfm/fa/items.main/parentcat/33739/subcatid/0/id/574261



Would imagine the Attached Cable part that Unicomp sells on their site is the same.
http://pckeyboard.com/page/Cables/ACable
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Offline rowdy

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Re: Replacing a non-removable cable on a Model M
« Reply #4 on: Mon, 08 July 2013, 23:37:55 »
Yes, a shame they do not show a picture of it.  Still, I don't even know if the boards work, so I might start with the non-removable cable one, solder a replacement PS/2 cable on to it (as per the article I linked), and see if it works.  But once I get that far I would probably leave it like that if it worked.
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"Because keyboards are accessories to PC makers, they focus on minimizing the manufacturing costs. But that’s incorrect. It’s in HHKB’s slogan, but when America’s cowboys were in the middle of a trip and their horse died, they would leave the horse there. But even if they were in the middle of a desert, they would take their saddle with them. The horse was a consumable good, but the saddle was an interface that their bodies had gotten used to. In the same vein, PCs are consumable goods, while keyboards are important interfaces." - Eiiti Wada

NEC APC-H4100E | Ducky DK9008 Shine MX blue LED red | Ducky DK9008 Shine MX blue LED green | Link 900243-08 | CM QFR MX black | KeyCool 87 white MX reds | HHKB 2 Pro | Model M 02-Mar-1993 | Model M 29-Nov-1995 | CM Trigger (broken) | CM QFS MX green | Ducky DK9087 Shine 3 TKL Yellow Edition MX black | Lexmark SSK 21-Apr-1994 | IBM SSK 13-Oct-1987 | CODE TKL MX clear | Model M 122 01-Jun-1988

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