The Commodore 64 MACRO ASSEMBLER DEVELOPMENT SYSTEM software package allows you to program in the native 6500 series Assembly language code, directly on the Commodore 64 computer.  It provides you with a very powerful macro Assembler, editor, loaders and two machine language monitors along with other support routines. These development tools operate like and provide the same level of direct machine interface as the Assemblers on much larger computers.

Thank you BlueCursor for the manual and software