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{{ safesubst:#invoke:Unsubst||date=__DATE__|$B= {{#invoke:Infobox|infobox}} }} TRS-DOS (which stood for the Tandy Radio Shack - Disk Operating System) was the operating system for the Tandy TRS-80 line of 8-bit Zilog Z80 microcomputers that were sold through Radio Shack through the late 1970s and early 1980s. Tandy's manuals recommended that it be pronounced triss-doss. TRS-DOS should not be confused with Tandy DOS, a version of MS-DOS licensed from Microsoft for Tandy's x86 line of personal computers (PCs).

TRS-DOS was primarily a way of extending the MBASIC (BASIC in ROM) with additional I/O (input/output) commands that worked with disk files rather than the cassette tapes that were used by most other TRS-80 systems.

TRS-DOS supported up to four floppy (mini-diskette) drives which used 514" (five and one quarter inch) diskettes with a capacity of 89K (kilobytes) each (later 160K). The drives were numbered 0 through 3 and the system diskettes (which contained the TRS-DOS code and utilities) had to be in drive 0.

TRS-DOS sections
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