FLEX Operating System User's Manual, copyrighted in 1979 by Technical Systems Consultants, Inc.
The FLEX OS is a three part OS for 8 inch floppy disks.
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the File Management System
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the Disk Operating System
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the Utility Command Set.
The FLEX Operating System was designed for the 6809 CPU (Central Processing Unit) chip. System requirements inlcuded
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12K random access memory (RAM) with specific memory accresses
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additional main memory (48K) making 56K memory total
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When running, the operating system occupied the top 12K of memory (addresses 48K to 56K)
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2 disk drives, connected to a controller and addressed as drive #0 and drive #1