I just acquired an HP 54645D on Ebay for $100. It was in nice shape when it showed up, if you count being coated in nicotine and fuzz inside and out as being in "nice shape"
So after a disassembly, scrub, cleaning the pots, and a full calibration, she's off and humming with the RS232/FFT/parallel module attached on the rear from my 54600B that I'm now getting rid of. I even made a set of digital probe cables for it from a cheaper set (dedicated post incoming with instructions).
Last thing to do is to upgrade the ROM. I found on this thread (post #5) that HP released a final firmware (~2003?) that "enabled all the features".
https://www.eevblog.com/forum/reviews/the-first-megazoom-asic-agilent-dso!/
Two questions:
1. Features?
2. Anybody have a copy of the ROM?
I can't seem to find the ROM anywhere. I have version A.02.08 currently, with the bug game and the badger "credits" screen.
Thanks