Midnight Assembly System for C128 Addendum 2 is a short pre-release note for MAS-128, a Commodore 128 assembly development system. It explains startup, major features, RAM bank usage, built-in 1700/1750 RAMDOS, disk/file commands, source conversion tools, editor/search features, custom function keys, and BRK-based pseudo-opcodes for extending 8502 assembly programming.