US NEWS & DUNGEON REPORT issues found in various versions of Mainframe Zork. Screenshots have been obtained from the pertinent versions.

Mainframe Zork Dungeon Report dated 22 July 1981. MDL source. Last version put out by Infocom. Platform:
Release:
Runs in: 		PDP-10 (MDL source code)
22 July 1981
Confusion MDL interpreter
Mainframe Zork Dungeon Report dated 11 March 1991. C source, translated from FORTRAN. Platform:
Release:
Runs as: 		Debian Linux (C source code)
11 March 1991
Binary compiled from C source
Mainframe Zork Dungeon Report dated 01 October 1994. FORTRAN source compiled for MS-DOS. Platform:
Release:
Runs in: 		MS-DOS (FORTRAN source code)
1 October 1994
DOSBOX
Mainframe Zork Dungeon Report dated 26 August 2004. Inform source, ported from MDL source. Platform:
Release:
Runs in: 		Agnostic (Inform source code)
26 August 2004
Frotz interpreter