Atari BASIC used 48-bit BCD floats and the routines were not well optimized, making it one of the slowest at the time(later retrohobbyists have made various pat

Atari BASIC used 48-bit BCD floats and the routines were not well optimized, making it one of the slowest at the time(later retrohobbyists have made various patches as well as faster BASIC implementations). It was also Microsoft-incompatible which made it an odd duck among the microcomputer BASICs.