People have been bouncing ZORK, DUNGEON and Infocom around a while now. Let's clear this up once and for all (I hope). First there was ZORK. That's it, just ZORK. No numbers, no nothing. This program was written in MDL and ran on PDP-10 systems only. MDL is a Lisp-like language implemented at MIT. You're probably out of luck if you ever want to play the original ZORK on anything but a PDP-10. A person at DEC managed to get the hands on the sources of ZORK. This person then did an implementation in FORTRAN, based on the MDL sources. This is the "paranoid DEC engineer who prefers to remain anonymous". The copyright on these FORTRAN sources say "(c) 1980, 1990 INFOCOM", by the way. The authors of the MDL ZORK then started a new company whose first product was ZORK. This was a rewrite of the MDL ZORK, in a new language that they developed for this purpose, called ZIL. The ZIL compiler generated code for a virtual machine called the Z-machine. And Infocom also wrote Z-machine implementations for most of the popular computers in the early 80s, including the PDP-11. This ZORK was 75% based on parts of the MDL ZORK, and 25% completely new stuff. Later is was renamed "ZORK I", when the sequel "ZORK II" came out (which was 50% MDL ZORK, and 50% new stuff). So, this leaves os with two ZORK, and one DUNGEON. Are they the same? No. But they all originated in the MDL ZORK. ZORK I was a reimplementation by the same persons who wrote MDL ZORK. New language, new parser, some new stuff, some stuff from MDL ZORK cut out, and probably some improvements as well. DUNGEON was a reimplementation from a version of the MDL ZORK, but written in FORTRAN. This wasn't even from the final version of the MDL ZORK. However, new stuff in the MDL code somehow usually got implemented in the FORTRAN version as well a bit later. Infocom only released ZORK I as a commercial product for the PDP-11. ZORK II and ZORK III never was. And if I remember correctly, they only released a version for RT-11 on one 8" floppy. However, as I said above, when Infocom started making the commercial product, they did it together with a virtual machine. So, as long as you have an implementation of that virtual machine, you can play any of their released titles. So, for the PDP-11 then, we have: The DUNGEON implementation (FORTRAN). ZORK I, from Infocom. ZEMU, which is my implementation of the Z-machine. With ZEMU, you can play almost any Infocom game, and ZORK I, II and III are available on the net. So it's no big deal to get these on a PDP-11 today. DUNGEON was slowly extended, and then moved over to VMS instead, and changed enough that recent versions can't really compile on a PDP-11. I've backported DUNGEON to RSX-11M-PLUS. But you can forget ever getting it working in an OS without support for split I/D-space. But if someone is interested in this, just let me know, and I'll help you out. ZORK I from Infocom was the game file for ZORK I, along with their implementation of the Z-machine for the PDP-11. I've never tried it, nor do I know anyone who have a copy. However, it's pretty pointless except as a curiosity item. I'm pretty sure my implementation is better, so if you just want to play the games today, I'd say you better go with ZEMU. Various C version can nowadays also be found. They are a translation ADVENT have also been mentioned now, and just for the sake of completeness I might add that ADVENT is a totally different game, and the inspiration for the people who wrote ZORK. ADVENT is written in FORTRAN, and there are numerous versions out there, with different people having made additions and modifications. And ZEMU *should* work on RT-11. I have a suspicion that maybe one or two routines might be missing. If they are, it will takes us close to zero time to fix it, if just someone with RT-11 steps up to the plate. I don't have any RT-11 systems, nor much RT-11 knowledge myself. I can write some code, but I definitely can't test it. Johnny -- Johnny Billquist || "I'm on a bus || on a psychedelic trip email: bqt at update.uu.se || Reading murder books pdp is alive! || tryin' to stay hip" - B. Idol