[stevekemp]

I never had one, and often lamented it!

Being able to pause a running game and peek/poke at the RAM would have been very useful for hacking games, though of course I'd still need to crack the loader to share the POKEs with other people.

[b3lvedere]

Oh it was. It had its own handy interface where you could alot of things live in the memory. I remember hacking for infinite lives/credits and finding out secret passwords. It was a very fun and very expensive ( for me ) device. I did not need it for copying games. There were some local hobby clubs which had almost every game and software.