8 bit BASICs were extremely tightly coded and packed a lot of functionality. They had working garbage collection for strings, with useful string processing built on it. Programs could be interrupted to safely return to the prompt, and errors which terminated the program informed the user of the line number, e.g. "illegal quantity error in 210". The internal, tokenized representation of programs could be interactively edited to update the program, which could be saved to disk. BASICS also had floating-point support, with functions like LOG, EXP, SIN, COS, TAN, ATAN, ... Also arrays, including multi-dimensional ones.