Infocom made my favourite adventure games. I played and completed most, including all the Zorks. Infocom's most intriguing to me - and one I confess I never finished - was A Mind Forever Voyaging. I'd love to talk to someone who got through that.
I have a Z-Code emulator; the original Zorks I, II & III (and Zork The Undiscovered Undergound) are freeware now and reside on my PC. I'd pass on the name of the emulator but I'm not at my own PC at the moment. I am still impressed by the sophistication of their parsing routines, literally years ahead of the competition. Oh, the nostalgia...
By the way, there are Z-Code emulators for pocket PCs, which themselves make ideal Infocom games machines.