DOS extender
The operating system used is Windows 3.0/3.1/95 and a graphical OS called Towns OS, based on MS-DOS and the Phar Lap DOS extender (RUN386.EXE). Most games for the system were written in protected mode Assembly and C using the Phar Lap DOS extender. These games usually utilize the Towns OS API (TBIOS) for handling several graphic modes, sprites, sounds, a mouse, gamepads, and CD-audio.