From "this Old Sgi"
http://www.geocities.com/SiliconValley/Pines/2258/4dfaq.html#pwrkeyboard
       Keyboard and Mouse
 The Power Series family uses a DB15 serial keyboard connector with the
 same specifications as the Professional Series family. Indeed, by
 wiring up an appropriate adaptor cable, you can use any of the SGI
 proprietary keyboards (SGI #950-0801-xxx) with the Professional,
 Power, Personal IRIS and Indigo series machines. The same goes for the
 mouse, which simply daisychains off of the keyboard. For more
 information, check the chapter in the /*Professional Series*/ section
 of this document entitled Keyboard and Mouse
 <http://www.geocities.com/SiliconValley/Pines/2258/4dfaq.html#keyboard>. 
 From "Chan's Pinout Page"
http://www.meadow.net/pinouts.html#sgikeydb9
  Mini-DIN-6 keyboard connectors are found on Indigo,
Indigo2, Indy, O2,
 Octane, and Onyx systems. This pinout is for Indigo systems which _is
 not_ P/S2 compatible. The pin assignments for the Indigo keyboard
 connector are shown in the following table:
                         ------
                        / 5 3  \
                       | ---  1 |
                       | ---  2 |
                        \ 6 4  /
                         ------
                     Pin Assignments
                   ___________________
                   Pin_|_Description__
                    1  | KRCD   Keyboard Receive
                    2  | MRCD   Mouse Receive
                    3  | GND    Ground
                    4  | Power  +8V
                    5  | KTXD   Keyboard Transmit
                    6  | Power  -8v
 ------------------------------------------------------------------------
 Older SGI systems used a DB15 connector for the keyboard and mouse,
 with either a DIN6 or DB9 connector at the keyboard end. Here's the
 pinouts for the DB15-DIN6 cable:
        DB15 Male       DIN 6           Signal/Signal
        ---------       -----           -------------
        2               3               Gnd/Gnd
        4               1               K_TXD/K_RXD
        5               5               K_RXD/K_TXD
        9               4               +12/+8
        10              2               M_TXD/M_RXD
        15              6               ???/???
 ------------------------------------------------------------------------
 And here's the pinouts for the DB15-DB9 keyboard cable:
        DB15 Male       DB-9            Signal/Signal
        ---------       -----           -------------
        1               -               Ground
        2               6               Ground
        3               9               Ground
        4               2               K_TXD/K_RXD
        5               8               K_RXD/K_TXD
        7               7               +12
        8               -               +12
        9               -               +12
        10              5               M_TXD/M_RXD
        15              4               -12
 ------------------------------------------------------------------------
 SGI P/S2 Keyboard and Mouse to RJ45 plug, using (2) mini-din6
 connectors to (1) RJ45 plug.
 Use to extend mouse & keyboard connections with RJ45 cable. ONLY for
 SGI systems that have P/S 2 compatible ports (Indy, Indigo2, O2, etc).
 This is a "Y" cable; two mini-din6 connectors are wired to one RJ45
 plug. A pair of adaptors is needed, one mini-din6 female set, and one
 mini-din6 male set. Custom made by Anixter 408/435-1212, but SGI I/S
 stocks them internally- contact alex(a)csd.sgi.com. $20.75 each, so pair
 is $41.50. Mark Aubin aubin(a)asd.sgi.com
  Mini-Din6 #1          RJ45 plug
(male or female)
  ------------          ---------
      5                 1
      4                 2
      3                 3
      1                 4
   Mini-Din6 #2
  -------------
      5                 5
      4                 6
      3                 7
      1                 8
 
Jules Richardson wrote:
 On Sun, 2003-12-07 at 19:37, Lyle Bickley wrote:
 However, by making a conversion cable you can use
any sgi -/+12V keyboard/
mouse using an EIA-232 interface.  I've done this for my 4D/25 and it works
great.  Any of the Single Tower, Twin Tower or Predator (Case types)
keyboard/mouses will work; i.e., Crimson, etc.
 
Interesting. I've only worked with Origin 200/2000 SGI machines so don't
know much about any of the older systems or the desktops.
Any idea if an Indigo keyboard is compatible? Reason I ask is that the
guy who's disposing of the machine has found a website describing a
convertor to allow a stock PS/2 keyboard and mouse to be used with an
Indigo.
If the 4D can use an Indigo keyboard then it should work with this
convertor, which would be a start...
cheers!
Jules
 
--
http://webpages.charter.net/jrice54/classiccomp2.html