BASIC Lightning v1.2 by David Hunter is an extension to the CBM64's resident BASIC interpreter which adds over 150 commands.  The additional commands cover three main areas: structured programming, graphics and sound. One of BASIC LIGHTNING'S most powerful features is the ability to multi-task; up to five parts of a BASIC program can be run at once. A compiler for BASIC LIGHTNING will be available in early 1985 which will produce "stand-alone" compiled programs.

Inside the archive is the complete PDF manual.