Radio Shack TRS-80 Model II Reference Manual page 67

Library Commands
ECHO
Echo Keyboard Input to the Display
This command allows you to type information on the Display without having
TRSDOS
interpret it as a command. Press
(BREAK)
to stop
ECHO
and return to
TRSDOS
READY.
Sample Use
You can key data directly to the printer by turning on dual routing and then starting
ECHO:
DUALON
ECHO
Now whatever you type will be output to the printer as well as to the display. (Most
printers will not print the line until a carriage return is received or the input buffer is
filled. )
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