FLEX (operating system)

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The FLEX single-tasking operating system was developed by TSC of West Lafayette, Indiana, for the Motorola 6800 in the 1970s; the original version was for 8" floppy disks, and the (smaller) version for 5.25" floppies was called mini-Flex. It was also later ported to the Motorola 6809; that version was called Flex9.

It is a disk-based operating system, and TSC (and others) provided several programming languages including BASIC in two flavors (standard and extended) and a tokenizing version of extended BASIC called Pre-compiled BASIC, FORTH, C, FORTRAN, and PASCAL. Later, TSC introduced the multi-tasking, multi-user, Unix-like uniFlex operating system, which required DMA disk controllers, 8" disk, and so sold in only small numbers. Several of the TSC computer languages were ported to uniFlex.

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