Here's the source code for three text adventure games: Adventure in Time, Birth of the Phoenix and Queen of Phobos, all published by Phoenix Software. I got these from the programmer, Paul Berker. My interview with him will be published in the ANTIC podcast soon.
Adventure in Time source code 1.DSK
Adventure in Time and Birth of the Phoenix includes both Apple // and Atari versions, because the Atari version was cross-compiled from the Apple. Note these are Apple // .DSK files. The modem version was a special version that allowed you to play the game online, presumably.
Images made with my Apple //: Apple DSK images.zip 588.49KB 228 downloads
The same disks, but imaged with kyroflux: Apple DSK images - KyroFlux reads.zip 597.24KB 180 downloads
All of the source code extracted as text files for your convenience: Extracted text files.zip 1.37MB 549 downloads
Edited by Savetz, Sun Nov 6, 2016 6:50 PM.