Everything that runs on a MAD-65 — or, in the simulator's case, stands in for one.
The MAD-65 simulator. Runs the whole console on a Windows PC: both processors, the video circuit, the sound chips and the joystick ports. This is how you play MAD-65 games without owning the hardware, and how games are written for it.
The first MAD-65 game. A horizontal underwater shooter — six levels, six bosses. Free public beta, bundled with the simulator, so there is nothing else to install.
The two 16 kB system ROMs, one per processor — the game API on one side, the drawing engine on the other. Already inside the downloads above; this is for replacing them, or for burning them for real hardware.