Cryptmorrow · the code
Every step of the game
93 sources and 40 programs, in folders named exactly as the book names them. Free to use in your own work, commercial or not, under the MIT licence.
Build and play
You need 64tass (assembler), VICE (emulator (x64sc)) and Python 3 (build, tests and verifier). Open a terminal in the folder and type:
x64sc -pal -autostartprgmode 1 -joydev2 1 -autostart releases/cryptmorrow-1.0.1.prgCheck everything
From the top folder of the full download, this assembles every source again and compares the result with the reference bytes:
python verify.py- Joystick in port 2; -joydev2 1 puts it on the numeric keypad: 8, 2, 4 and 6 move, 0 is Fire.
- Each step folder in chain/ has its own copy of every source and tool it needs, and builds on its own. variants/ holds the 22 experiments of the book, each with a README.
- Built with 64tass 1.60.3243 and tested in VICE 3.10 on a PAL C64 with a 6581 SID.
Chapter by chapter
Packed on 2026-10-08 from the repository. Every zip contains the licence.