This was used to communicate with an HP frequency meter but has not been used in a while and I disposed of the meter. Therefore it is a bit redundant.
When last used (about 18 months ago) it was in fine fettle so I can't see nay reason why it should not still be AOK.
If you are an HP afficianado check my other listings as I am having a blitz on my surplus to requirement HP85 stuff.