ASSEMBLER 64 is a two-pass 6510 or 6502 assembler for the Commodore 64. It's written entirely in machine language and occupies 8K bytes of RAM. It allows free-form input using the builtin BASIC editor, produces complete assembly listings, loadable symbol tables, various options for storing created object codes, redefinable symbols, and a comprehensive set of pseudo-ops (assembler directives) for such things as creating macros or conditional assembly. The syntax for the most part adheres to the MOS standard.