Lots of its features come from BASIC, like "on error goto" (even though it now worked with labels rather than line numbers). It is a more structured kind of BAS

Lots of its features come from BASIC, like "on error goto" (even though it now worked with labels rather than line numbers). It is a more structured kind of BASIC than many of its predecessors, but procedures and functions have appeared in earlier BASICs such as BBC BASIC, or I think later versions of QuickBASIC.