I still find the #HP9816 useful today, to control #GPIB instruments. I wrote two programs, one to control the Bruel&Kjaer 2034 audio spectrum analyzer to do third-of-octave analysis and another one to do various measurements with a #HP4277A LCZ meter. If I need to further process data, I download them on a modern computer using a RS232 cable I built. I transferred and published the HPBASIC source of the third of octave software on Github: https://github.com/DarwinNE/BK2034_GPIB/tree/master/HPBASIC

I reorganised the main menu of the #HP4277A control program running on the #HP9816. I still have to work on the C vs V measurements. If you have studied a #mos structure you’ll know it is THE measurement to do to understand what’s going on.

Here is another picture of the whole set #HP9816, #HP7475A, hidden an #HP9122 and an #HP9134, the Bruël & Kjær 2034 and the #HP4277A LCZ meter.