TRS-DOS
TRSDOS Boot Screen
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| Developer | Tandy |
|---|---|
| Working state | Historic |
| Source model | Closed source |
| Initial release | 1970 |
| Latest release | 1.3 / May 1, 1981 |
| Available in | English |
| Platforms | TRS-80 |
| Kernel type | Monolithic |
| Default user interface | Command line interface |
TRSDOS (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. TRSDOS should not be confused with Tandy DOS, a version of MS-DOS licensed from Microsoft for Tandy's x86 line of personal computers (PCs).
TRSDOS 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.
TRSDOS supported up to four floppy (mini-diskette) drives which used 5¼-inch diskettes with a capacity of 89KB each (later 160KB). The drives were numbered 0 through 3 and the system diskettes (which contained the TRSDOS code and utilities) had to be in drive 0.
Some typical TRSDOS utilities:
Although MS-DOS owes its heritage most closely to CP/M and thence to TOPS-10, many of the file manipulation commands are very similar to those of TRSDOS. By comparison the CP/M command for copying files was called pip (both a pun on the Pip printers, a chain of copy centers in that era, and an acronym standing for "Peripheral Interchange Program").
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