Tandy 1000 Basic Reference Manual page 345

Chapter 10 I BASIC Keywords
When you set the width for the communications channel, BASIC
sends a carriage return after every size character up to and in-
cluding 254. A width of 255, however, is interpreted as "infinite"
width and disables line wrapping. The default for communica-
tions channels is 255.
To
set WIDTH
at
the screen, you may omit the LPRINT option
in the first form of the syntax, like this:
W I D T H 4 0
or you may use the third form of the syntax and specify the
device:
W I D T H " S C R N : " , 40
You may only use the WIDTH statement to select a width of 80
if you are using the VM-2 Monochrome Monitor or CM-2 Color
Monitor. If you are using the VM-2 Monochrome Monitor or the
CM-2 Color Monitor, you should note the following:
If you change the screen width, BASIC clears the screen and
sets the background to black and the foreground to
white.
Changing the screen width does not affect the color enabling/
disabling value (burst value).
If the current video memory (allocated through a CLEAR
statement) is not enough t o accommodate the new screen
mode, BASIC issues an "illegal function call" error.
0
The table below shows the actual effect of WIDTH statements
on the various modes. Given a particular mode and width, the
table shows the new screen mode that results.
Width
20 40 80
0
8
1
8
2
4 s
8 E
4
5
+ o
3
b
5
6
u
~
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