SGIs do not only use different keyboard connects, but also different
keyboard types with respect to signaling. But the 4D style and
Personal IRIS style keyboards both use the same electric signals,
so you can simply build a converter.
IRIS 3000 Style
The IRIS 3000 has a DB15 connector, but I don't know if the keyboard
is compatible to the personal IRIS. But when you have a look at
the keyboard of my IRIS
3130, then I have my doubst, as the keyboard has some very
unusual keys and others are missing.
Personal IRIS Style
All newer SGIs (beginning with Indy and Indigo²) use standard
PS/2 connectors for mouse and keyboard, thus you can use almost
any conventional keyboard.