Your POWER ASSEMBLER actually encompasses two standalone machine-language development systems for the Commodore 64 and three for the Commodore 128 (in 40-column mode). One uses the BASIC editor (enhanced by string SEARCH & REPLACE commands) for writing its memory-based source and the other its own powerful ASCII editor. For the Commodore 128, there is also a complete Z/80 (CP/M microprocessor) cross-assembler which has all the powerful commands and features of the other two programs.