IBM H SERIES RS/6000 - Manual (Page 26)

All of the keyboards adjust for typing comfort. To tilt the keyboard, pull out the key-
board legs. The legs snap into position. To decrease the tilt of the keyboard, rotate
the keyboard legs until they snap into the bottom of the keyboard case.
The keyboard cable plugs into the keyboard connector at the rear of the system unit.
2-6 RS/6000 Enterprise Server Model H Series User's Guide