[Shiunbird]

For the record, closing the loop on the discussion started here:
http://forums.irixnet.org/thread-3274-page-2.html

My C8000 came with a non-US keyboard (German) and runs 11.11.
On Linux, if you set the keyboard to US, the key # ' registers \ | correctly.

Nothing I tried could make the key register anything on HP-UX, it comes blank, so I can't even match it to anything. None of my other keyboards, including an original model M with DIN to PS2 and then PS2 to USB adapter did the trick. This keyboard works with every machine I own except the C8000.

I did some investigation and after checking a few random fonts on xfd, I found out that a few don't include the full pipe at all, only the pipe cut in the middle, which seems odd to me, but doesn't explain the problem.

I ended up assigning the print screen key via

Code:

xmodmap -e "keycode 96 = backslash bar"

 
And now I can live a happy life - the C8000 is now officially my main C learning machine.

With thanks to Tru for suggesting xmodmap.