Tandy 1000 Basic Reference Manual page 193

Chapter 10 I
BASIC
Keywords
KEY ON
KEY
ON displays the function key assignment values on Line 25
of the screen. If the screen width is 40, the screen shows 5 func-
tion key assignments at a time. If the width is 80, the screen
shows 10 assignments at a time. Press
(CTRL]
p)
t o display the
next screen and to erase the display after the last assignments
are shown.
KEY OFF
KEY OFF erases the soft key assignments from Line 25. The as-
signments are still active, but the screen does not display them.
BASIC reserves Line 25 for the function key display. Even if the
display is turned off, BASIC does not display program lines on
Line 25.
Note: Instead of using KEY ON and KEY OFF, you
can use
[m]
[TJ as a toggle switch t o turn the key as-
signment display on and off, as well as to cause it to
advance to the next screen.
KEY LIST
KEY LIST displays all 15 characters of all 12 soft key assign-
ments on the screen.
Note: If your program contains an INKEY$ and you
press a function key, BASIC returns 1 character of the
key assignment at a time. For example, suppose this
st at ement is executed:
A$
=
INKEY$
Now suppose you press
I ,
which initially has the
value LIST. The first time the statement is executed
A$ equals L, the second time A$ equals I, and so on.
Keep this in mind when writing
a
BASIC routine
t o
trap for a certain key. Your routine may not perform
as expected if you accidentally press a function key.
191