KOALA, the monochrome emulator, makes it possible to run software written for monochrome monitors (e.g. SIGNUM!) on a color screen. KOALA has the following features:+ Free adjustment of the refresh rate. So you can choose between high frame rate or high computing power.+ Image build-up during disk access can be switched off+ Screen hardcopy on disk (color and b/w image). KOALA is compact, fast and suitable for all ST- TOS versions (1.0-1.6).