Radio Shack TRS-80 Model II Reference Manual page 17

Model II
TRSDOS
Introduction
Model II
TRSDOS ('
'Triss-Doss' ') is a powerful and easy-to-use Disk
Operating System, providing a full set of library commands and utility
programs. In addition, many of the most useful System routines can be called
directly by user programs.
Library commands are typed in from the
TRSDOS
command level to
accomplish a variety of operations, including:
• Initialization -setting Printer parameters, date and time, etc.
• File-handling-copying, renaming, deleting, protecting, etc.
• File access-loading into memory, listing to Printer or Display, etc.
• Error identification
See the Commands section for details.
Utility programs provide essential services like:
• Formatting blank diskettes.
• Making backup copies of entire diskettes.
See the Utilities section for details.
System routines are executed via function codes instead of calls to absolute
memory addresses. Routines available fall into seven categories:
• System control
• Keyboard input
• Video Display input/output
• Line Printer output
• File access
• Computational functions
• Serial communications
See the Technical Information section for details.
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