 A patch that allowed CP/M to run on the new drives killed off any interest in alternatives like PTDOS, and new business applications like WordStar and Electric Pencil soon cemented CP/M as the standard operating system for all S-100 machines.Processor Technology continued selling the Helios system and refused to consider replacing PTDOS with CP/M.Helios proved to be highly unreliable and resulted in a lawsuit by those owners that had purchased them.