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Atari XL User Manual

Atari XL
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152 The
Atari
XL
Handbook
21000
RETURN
22000
DATA
1,1,1,-1,1,0,0,0,-1,1,-1,
-1,-1,0,0,0,0,1,0,-1,0,0
To
use
this
program
you
will
need
a
joystick,
which
may
be
plugged
in
to ei
ther
of
the
ports.
The
program
is
controlled
entirely
by
the
joystick,
with
no
keyboard
actions
at
all.
After
the
setting
up
routines
have
been
run,
pressing
the
Fire
button
on
the
joystick
will
display
a
blank
graphics
7
screen,
with
a
text
window.
The
cursor
will
be
visible
as
a
yellow
spot
in
the
top
left
corner
of
the
screen.
Use
the
joystick
to
move
the
cursor
around
the
screen,
and
hold
down
the
Fire
button
while
moving
the
cursor
to
draw
lines.
To
change
colour
or
clear
the
screen,
move
the
cursor
down
into
the
text
window,
position
it
over
the
command
you
require,
and
press
Fire.
There
are
four
colours
to choose from:
red,
yellow
and
blue,
and
the
background
colour
(selected
by
ERASE).
If
you
find
that
the
display
is too
fine
in
mode
7,
you
can
change
the
program
to
run
in
mode
5
by
altering
line
1000,
when
specifies
the
mode,
and
also
by
altering
the
tests
in
lines
1140
and
1150
which
check
whether
the
cursor
is
running
off
the
edge
of
the
display.
You
will
also
need
to
alter
line
2020,
which
calculates
the
cursor
position
in
the
text
window
after
it
crosses
from
the
graphics
display,
and
line
2300,
which
calculates
the
cursor
position
in
the
graphics
display
as
the
cursor
leaves
the
text
window.

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Atari XL Specifications

General IconGeneral
Release Year1983
CPUMOS Technology 6502C
GraphicsANTIC, GTIA
SoundPOKEY (4 channels)
StorageCassette tape
PortsCartridge
Operating SystemAtari BASIC
CPU Speed1.79 MHz
RAM64 KB

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