This cartridge, which included an overlay, provides an "easy" way to program the Astrocade in machine language. Though not a Z-80 assembler, MLM does simplify the entry of hex code (which otherwise must be entered using decimal via BASIC. Also, the keypad layout does not require the use of the key-shifts, so typing is faster). Programs can be saved via the Bally BASIC 300-baud interface (later, subroutines were written that allowed the 2000 baud version of Bally BASIC (#6004) to be swapped out for tape saving). "Machine Language Manager" does NOT have a built-in cassette interface.