I have a super generic high speed logic probe "LP-3" straight out of 1980 they (for obvious reasons) don't make them anymore. It's good up to 35mhz (15ns pulse capture which is plenty fast for all 74 series TTL and CMOS) it was quite expensive when I bought it. It's performance is quite good for what it is.
I've long since lost the grounding clip for it, but it still works just fine getting ground through the power supply circuit, so I just make sure i have a common ground rail power supply when I use it. it get's a little sketchy above 10mhz due to the long ground acting like an antenna...but if need be, i'd just make a clip for it.
https://www.tequipment.net/GlobalSpecialtiesLP-3.htmlI've often dreamed of getting a radioshack probescope but in the last 15 years i've done electronics I've had to bust out the logic probe maybe a half dozen times... the oscilloscope, probably less than 3.
If I were to suggest a modern logic probe and If i were replacing my probe, I'd probably buy this one.
https://www.tequipment.net/ElencoLP-900.html?v=54851being able to manually inject a pulse would be super handy... or this one...since it appears to be a direct descendant of mine...and I already know how to use this one.
https://www.tequipment.net/ElencoLP-525K.html?v=54851otherwise something in the 25 to 50mhz range will cover you for 99% of the speeds running in arcade boards... short of PC based systems.