Indigo mini-DIN 6 to 4D DB-9 keyboard/mouse adapter

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zuluchas
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Indigo mini-DIN 6 to 4D DB-9 keyboard/mouse adapter

Unread postby zuluchas » Sat Apr 30, 2011 10:26 pm

I spent an hour or so cobbling together an adapter cable to be able to attach a 4D-series keyboard (which has a DB-9 connector) with an Indigo (which has a mini-DIN 6 port a la PS/2). No worky.

Some background:
Chan's Pinouts page (http://www.meadow.net/pinouts.html#sgkydb15din6) has adapters for converting DB-15 to DIN-6 and DB-15 to DB-9, but when you try to connect the dots from DB-9 to DIN-6...there's something missing.

Code: Select all

DB-9  |  Signal  |  DIN-6
------+----------+-------
6     -  Ground  -  3
2     -  K_T/RXD -  1
8     -  K_R/TXD -  5
5     -  M_T/RXD -  2
4     -  -12V ?  -  6
?     -  +12/+8? -  4


Looks to me like there's an inconsistency on which line should be delivering power and at what voltage.

Anyone have one of these adapters to be able to trace the proper signal paths, or know of a good resource?

Here's another source for the 4D keyboard side of things: http://www.martnet.com/~bobd/sgi/4dfaq.html#keyboard
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Re: Indigo mini-DIN 6 to 4D DB-9 keyboard/mouse adapter

Unread postby PymbleSoftware » Sat Apr 30, 2011 11:00 pm

This would be an excellent addition to the keyboard wiki topic...

Chris "the keeper" of CK systems seems to know something about this area.. making those adapters.

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Re: Indigo mini-DIN 6 to 4D DB-9 keyboard/mouse adapter

Unread postby jan-jaap » Sun May 01, 2011 5:49 am

The definitive resource: http://techpubs.sgi.com/library/tpl/cgi ... keyboard.z

As you can see, the older 4D systems supply +/- 12V to the keyboard. Those are the very heavy, metal keyboards.
The Indigo supplies only +8V to it's keyboard.

If you wired your adapter correctly, then the conclusion is probably that either the negative voltage is actually used, or 8V is not enough to make it work reliably.

The other way around works fine: I usually use an Indigo keyboard and mouse on my older 4D series. I don't like the optical 4D mice with their metal mouse mats very much. I have an SGI original DB9 - mini-DIN6 cable. It came with a 4D/25 that was sold with an Indigo keyboard and mouse. I also have a similar, original DB15 - mini-DIN6 cable.
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Re: Indigo mini-DIN 6 to 4D DB-9 keyboard/mouse adapter

Unread postby zuluchas » Sun May 01, 2011 8:17 am

jan-jaap wrote:The definitive resource: http://techpubs.sgi.com/library/tpl/cgi ... keyboard.z


Ahah! That did it. Compare the two pinouts (DB-9 and DIN-6) in the man page with chan's pinouts and the answer is pin 7 on the DB-9 needs to be connected to pin 4 on the DIN-6 to deliver V+ like so:

Code: Select all

DB-9  |  Signal   |  DIN-6
------+-----------+-------
6     -  Ground   -  3
2     -  K_TX/RCD -  1
8     -  K_RC/TXD -  5
5     -  M_TX/RCD -  2
4     -  -V       -  6
7     -  +V       -  4


And viola, a working 4D keyboard (p/n 021-0800-001 rev A) and mouse (p/n 021-0004-002) on an Indigo!
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Re: Indigo mini-DIN 6 to 4D DB-9 keyboard/mouse adapter

Unread postby PymbleSoftware » Sun May 01, 2011 2:35 pm

@ zuluchas Thanks for the wiki update to the keyboard topic.

The definitive resource:
Should be us, SGI are no longer supporting MIPS based systems and we should archive whats left on the web before it goes...

At this point in time, IRIX/MIPS documentation, can never be anything more than a cost center for rackable, and its only a matter of time before a bean counter sharpens his pencil, and its long overdue.

R.
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