AMOSi:Cls

an example can be found on AMOSPro_Examples:Examples/H-3/Help_39.AMOS

CLears all or part of a Screen in one of three ways:

Cls

Clears entire screen using the current paper colour.

Cls colour

Clears screen using the selected colour index.

Cls colour,tx,ty To bx,yb

Erases the block from tx,ty to bx,by