ITT Pomona made a logic probe kit to interface with an analog scope, mdl MX 9100. It had 8 inputs, but you could cascade up to 3 units for 24 points to monitor. Operating frequency was DC to 20 MHz. It had trigger word capability and other trigger options. It had 3 memory banks with 16-word memory depth each for replay; not much but worked pretty well. I don't know how it would work with a DSO, but I expect it would be ok. If you can hunt one down, it might be an inexpensive option for you. Just a thought.