You mentioned Emulators, so you might have stumbled onto this:
Here is an address to a DOS emulator:
http://www.pocketdos.com/
You might be able to run Zork in it.
I'm going to give it a try for my old passion; the "Qwest for Glory" series by Sierra.
I've downloaded the games, I just need to try the emulator.
I never played Zork, but Adventure (another text based game) was very fun on my old Apple IIc (which still works perfectly by the way, around 20 years old).
KC
If you tried to DOS emulator, let me know your results.
Thanks