FLEX (operating system)

FLEX is a discontinued single-tasking operating system developed by Technical Systems Consultants (TSC) of West Lafayette, Indiana, for the Motorola 6800 in 1976.

TSC also wrote a version of FLEX, Smoke Signal DOS, for the California hardware manufacturer Smoke Signal Broadcasting; this version uses forward and reverse linkage bytes in each sector which increase disk reliability at the expense of compatibility and speed.

Later, TSC introduced the multitasking, multi-user, Unix-like UniFLEX operating system, which requires DMA disk controllers, 8" disk, and sold in small numbers.

During the early 1980s, FLEX was offered by Compusense Ltd as an operating system for the 6809-based Dragon 64 home computer.

The following commands are supported by different versions of the FLEX operating system.