Standard Apple Numerics Environment

Standard Apple Numerics Environment (SANE) was Apple Computer's software implementation of IEEE 754 floating-point arithmetic. It was first available for the 6502-based Apple II and Apple III models and came standard with the 65816-based Apple II GS and 68k-based Lisa and Macintosh models. Later Macintosh models had hardware support through discrete 68881/68882 floating-point coprocessor units (FPUs) or units built directly into high-end 68040 processors. However, SANE was still made available for compatibility with existing software, especially when run on entry-level systems that did not have hardware FPUs, such as the lower-end 68LC040 processors.

SANE was eventually phased out as Apple switched from 680x0 to PowerPC processors which had built-in floating point units.