Optimized Systems Software created a series of enhanced BASIC interpreters: BASIC A+, BASIC XL, BASIC XE. Commercial BASIC compilers for Atari BASIC were available: ABC (Monarch Data Systems, 1982), MMG BASIC Compiler (1984), Advan BASIC (1985).
Optimized Systems Software produced a series of upgraded BASIC interpreters including BASIC A+, BASIC XL, and BASIC XE. Commercial Atari BASIC compilers were available: ABC (Monarch Data Systems in 1982), MMG BASIC Compiler (1984), and Advan BASIC (1985).