All of the old Zork games including the graphical adventures are on GOG if you can't find your copy. Zork Anthology is a collection of all the Zork text adventures. The Zork games all sell for €1,49 I think it was whenever they are on sale, which GOG does quite often, so just wait for a sale and grab them all, that's what I did :)

My foray into computers started with the Amiga 500, didn't even know what type of computer that picture shows, but it looked like an old school Terminal so I had to use it here, fit perfectly :)