PC-DOS 386 or higher, with VGA or SVGA graphics; maths co-processor, mouse (optional). (ideally a fast 486 with 8MB ram). The code is written in C and compiled with the Watcom C32 compiler (and the Rational Systems DOS extender) giving access to extended memory. The supplied Watcom file ``dos4gw.exe`` must be in the same directory as ``ddlab.exe``.
A9.2 UNIX/XWindows platform.
Compiled for the SUN OS 4.1.