« previous next »
Pages:  [1]     Go Down

Author Topic: Installing PS/2 cable next to a SDL port on a Model M...  (Read 4704 times)

0 Members and 1 Guest are viewing this topic.

Offline Ethaniel

  • Thread Starter
  • Posts: 15
Installing PS/2 cable next to a SDL port on a Model M...
« on: Sat, 01 March 2014, 03:56:14 »
Greetings everyone,

I'm having problems finding SDL cables for my Model M's. Recycling centers are dry, and buying them online is not an option down here at the moment (customs must rot in hell, etc. etc.). So, I've been studying one of the controller boards, and saw this "J2" port/connector/thingie. Looking at the back of the controller, it seems that J2 is connected to J1. Now, the question: Can I solder a pin header or something similar on J2 to bypass the SDL port and connect a standard PS/2 cable from another keyboard? I have a few vintage PS/2 cables that would look great on a Model M. I assume I'll have to drill a hole next to the SDL port, but I can live with that. I have the SDL pinout from KbdBabel, so tracing each dot shouldn't be an issue... I hope...

P.S.: I've tried half a dozen searches and nothing came up on the forum. If this has been asked before, I apologize.
Logged

Offline fohat.digs

  • * Elevated Elder
  • Posts: 6490
  • Location: 35°55'N, 83°53'W
  • weird funny old guy
Re: Installing PS/2 cable next to a SDL port on a Model M...
« Reply #1 on: Sat, 01 March 2014, 09:09:52 »
That seems reasonable.

I have never tried it, but please let us know if it works.
Logged
How the hell or why did you become a DEMO-crat?” He asked.
“Long story, but it started with Nixon, then I was educated and know history as the Republicans are all about getting power to exploit it to their benefit, while Democratic politicians, for the most part, are for distributing things more equitably. I’ll finish with the overwhelming sociological and psychological evidence in studies that identify that conservatives see the world through inherent inequity where the elite or those who seek to be elite are superior to the commoners, and it is they who should lead. At the same time, liberals look at the world as inequality and seek to make the world more equitable, and that all should be represented. Ultimately, conservatives trust those in authority, while liberals inherently distrust those in authority to take advantage for themselves or their constituency.”
He looks up and says, “No one ever explained that to me, and then asks, “If **** Cheney thinks that Trump is that bad, then it's not about DEMO-crats vs Republicans, is it.”
I resume walking and then say, “Hey, you got it; it's the Democratic and old Republican parties versus Trumpism, which is American fascism aided by the Russians.”
- RWN 2024-09008

Offline dorkvader

  • Posts: 6288
  • Location: Boston area
  • all about the "hack" in "geekhack"
Re: Installing PS/2 cable next to a SDL port on a Model M...
« Reply #2 on: Sat, 01 March 2014, 11:31:53 »
It should work. One thing to be cautions of (other than getting the proper pinout) is to ensure that the second pin from the left in your second image actually goes to the farmost right pins of the SDL. They both appear to be ground, but I dont see any direct continuity between them in the image.

edit: no, nevermind it's there. JP1 connects them. You should be good. Be careful not to reverse power and ground.
---
Also, I don't know about SDL cables, but you can get SDL connectors online. TE connectivity still makes them (and it appears that IBM POS keyboards still use them). The part number is 1-520424-2 and I think onlinecomponents still has stock. You don't need the rest of the metal housing or the ferrule as long as you glue the cable properly.

I have a straight IBM cable that appears to have been made by orihalcon that was done this way. Category 6 cable was used and just the SDL plug was on the end. It was superglued in place and works very well.
« Last Edit: Sat, 01 March 2014, 11:35:57 by dorkvader »
Logged

Offline Ethaniel

  • Thread Starter
  • Posts: 15
Re: Installing PS/2 cable next to a SDL port on a Model M...
« Reply #3 on: Sat, 01 March 2014, 17:44:10 »
So, if I use the SDL pinout from KbdBabel, and combine that info with some multimeter tests, I get the projected pinout on the last image (please check it, all corrections are welcome). One thing: "1" should be floating just like "6", but there's two bridges connecting it to GND. If the pin on the SDL cable is floating, that shouldn't be a problem... but I'm tempted to cut those bridges with an X-Acto knife or similar, just in case. Now I need to find a pin header small enough to fit there. I guess I'll butcher an old sound card or something, standard pin headers are too big.

I would love to buy those connectors, and SDL cables as well, but we have a bit of a nuclear war with customs down here. I'm still waiting for two Teensy clones I bought in november, and I'm receiving packages with a delay of 100 days or more. It's a nightmare.
Logged
Pages:  [1]     Go Up
« previous next »