Not that I'm aware of, but a lot of the 80s era HP gear that I have calls for one in the troubleshooting section, so I've had a search set up for quite some time. This one showed up in what looked like decent condition for a low price relative to what most wanted for them, so I decided to grab it. May never really need it, but it's small and was inexpensive, so why not have it handy should the need arise?
-Pat