iS-DOS Math is a set of mathematical programs for ZX-Spectrum home computer running iS-DOS operating system. Includes calculator, graph plotter and symbolic formula processor for engineering calculations.
youtube.com/watch?v=zsjTpFR0oYQ ignore that this maths shit does it use the 4MHz in the fdd3000? micro command? PDS one processor at a time sweet jeeeez ftp://ftp.nvg.ntnu.no/pub/sam-coupe/demos/misc/octopuss.zip