What is supported
The machine follows the Z-Machine Standard 1.1 and reports revision 1.1 in the header.
Versions
| Version | Games | Supported |
|---|---|---|
| 1, 2 | the earliest Zork releases | no |
| 3 | most Infocom games: Zork I-III, Planetfall, Hitchhiker's Guide | yes |
| 4 | A Mind Forever Voyaging, Trinity, Bureaucracy | yes |
| 5 | Beyond Zork, Border Zone, Inform games | yes |
| 6 | the graphical games: Zork Zero, Journey, Shogun | no |
| 7 | rare Inform builds | yes |
| 8 | large Inform games | yes |
Left out
| Feature | What happens |
|---|---|
| colours, text styles, fonts other than 1 and 4 | ignored; the header says colours are unavailable |
| sound effects | ignored |
| timed input | the game waits without a timeout |
| output stream 2 (transcript) and 4 (commands) | the header bit is kept, nothing is written |
| input streams | ignored |
| auxiliary save files | save and restore with operands fail |
| mouse, menus, pictures | refused in the header |
Conformance
The test suite runs these story files, in testdata/, on every push:
| Suite | Versions | Result |
|---|---|---|
| Czech 0.8 | 3, 4, 5, 7, 8 | every test passes |
| Praxix | 5 | every test passes |
Zork I (Release 119, the one Microsoft published under the MIT licence in 2025) plays turn for turn as in Frotz, and save files move between the two in both directions.