Retro Logic Analyzer: HP 1607A (1975)

So here’s how you could debug your digital projects back in the day, if you decided to buy one of these instead of a nice new car. It uses the very first Intel chip, the 3101 64-bit static RAM, which was a very high speed chip for the time. (From an experiment done later in the video, it appears to run at 50 MHz without difficulty.)

The triggering options are pretty impressive.

As a bonus, the video also shows a cheap ($12) Salae USB analyzer knock-off. For those sorts of things all the real work is done in the software now. I recommend sigrok and its related software.