Run
the program. The text window at the bottom of the screen
changes
color along with the dark blue text because register 2
governs the text window
as
well
as
the text display.
Getting Rid of the Text Window
Sometimes you may not want the text window to appear
in
you r pro-
grams.
To
eliminate the text window, simply add 16 to the graphics
mode number. Change
line
20
to GRAPH
IC
S
17
and delete line
70.
The PRINT command will always print
in
graphics mode
O.
If you are
in
modes 1 or
2,
if you don't have a text window, and if you use the
PRINT command and the PRINT
#6;
command, the computer gets
confused and prints everything
in
mode
O.
Add this line:
79
PRINT
"
WINDOW
TEST"
Run
the program to see what happens. If you use PRINT and PRINT
#6;
you must use a text w
in
dow to have mode 1 show
up
on
the
screen.
Delete lines 100, 110, 120, and 130.
Run
the program. WINDOW
TEST
and then
READ
Y appear at the top of the screen. List the program.
Line
20 specifies mode
17
(mode 1 without the text window), but
where is it?
Replace line
70
with this lin
e:
79
GO
TO
79
When you run the program, the mode 1 screen comes back. When
you use mode 1 or 2 without a text window, you must use a
GOTO
loop
to keep the display
on
the screen or it will flash by too fast to
be
seen. Pressing the I Break I key returns you to mode O.
To
see an example of mode
2,
li
st the
Co
lorful Text program and
change
line
20
to
29
GRAPHICS
1.8
Graphics
18
stands for mode 2 plus 16 (no text window).
Run
the
program. Now you have
LAR
GE
colorful text.
To
return the screen to its original colors, press the I Reset I button or
type
SETCOLOR 2,9,4. You will not lose your program when you press
I Reset I
in
ATARI
BASIC.
Ho
wever, that feature may not apply to other
languages or programs.
72
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