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In those days, with few exceptions, the software was designed to work on the disk operating system (DOS).
The nation's biggest-selling computer disk operating system (translation for DOS), which is celebrating its 10th anniversary, has quashed rumors of its anticipated obsolescence.
S/T 3 requires an IBM PC with 128K, of main storage, at least one floppy-disk drive, an 80-character display, and an IBM Disk Operating System.