As no computer should be without Zork, I wrote a a Z-machine interpreter for CP/M-65. It only supports v3 games, which seems to be the version used by most classic games and I wanted to avoid all the exceptions for v1 and v2, and supporting the newer version doesn't really make sense on limited hardware.

In order to run with as little TPA as possible (even though the binary is quite large...) I use a simple system with cached pages to load the needed static parts from disk as they are accessed. For the dynamic RAM, zmalloc is used to allocate it when the game header is loaded, so it should (hopefully) fail gracefully if it doesn't fit in the available memory.

The status bar is not implemented currently as the binary was getting large enough without it. I may try to implement this later and only show it if the screen driver is available.

Saving/restoring games is supported if the games implement it. There is no check if the restored file is for the correct game, so there is some potential for interesting crashes there.

I have tested it with Zork I-III, Mini-Zork, Planetfall, Hollywood Hijinx etc. and it all seems to work fine (although I'm sure there are still a lot of bugs hiding in there...).

z65 itself + the freeware 10k adventure Moonglow has been added to all platforms where it fits on the disk (i.e. all except BBC Micro, all Commodores, some Ataris, some OSI).

I put the code under third_party as this was like a small project of its own to write.

Below are some screenshots:

Zork I running on the Atari 800

Mini-Zork running on the Oric

Moonglow running on the Apple II

Moonglow running on the BBC Micro

Moonglow running on the C64

Moonglow running on the OSI600