HP 98568A Installation Instruction page 488

HP 46086A Button Box
Description and Support
The HP 46086A Button Box provides 32 user-definable buttons for menu
selection, and one user-programmable LED. Buttons can be labeled with
defined functions, freeing the display for other uses. It includes one pre-printed
and two blank overlays, and connects to your computer via the HP-HIL
interface.
HP 46086A Button Box
Series 300 HP-UX Operating System Support
on Release with Model
5.0 or later all Series 300
10-46 Adding Miscellaneous Peripherals