Keyboard Input
Display Output (Video)
Printer
Standard Input
Standard Output
Job Log
Devices
There are two kinds of TRSDOS devices: physical and logical.
A physical device
is
a piece of your computer hardware: the video
display, the keyboard, the printer, etc.
A logical device (devspec) is a connection between TRSDOS and a
physical device.
TRSDOS lets you treat your devices independently, which means you
can sometimes substitute a device for another one. You can also
substitute a file for a device. See the LINK, ROUTE, and SET library
commands.
Devspec
When you want
to
access a device, you use its device specification or
devspec.
TRSDOS devices already have devspecs assigned to them. You
assign devspecs to devices that you create. The devspec is the
standard TRSDOS format you'll use every time you reference your
device:
*two-/etter abbreviation
Your original TRSDOS master diskette is configured with six devices.
They are:
Devspec Device
*KI
*DO
*PR
*SI
*SO
*JL
Drivers And Filters
Each device
is
controlled
by
its own driver program, filter program, or
both. You can change a device's I/O by manipulating its driver or filter
program. For more information
on
drivers and filters see the SET and
FILTER commands; see also Appendices I and
K.
1-10
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