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Atari XL User Manual

Atari XL
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110
The
Ateri
XL
Handbook
case
the
destination
is
6,
which
represents
the
screen.
This
technique
is
commonly
used
to
send
data
to
peripheral
devices
such
as
the
cassette
unit
(see
Chapter
16)
and
here
we
are
treating
the
model
screen
as
ifit
were
a
peripheral
device.
The
colour
and
luminance
of
the
message
displayed
by
the
last
program
is
controlled
by
colour
register
0,
and
can
be
changed
with
the
SETCOLOR
command.
However
it
is
possible
to
display
characters
in
up
to
four
different
colours
on
a
mode
1
or
2
screen,
as
the
following
program
demonstrates.
10
GRAPHICS 1
20
PRINT#6;"REGISTER
ZERO"
30
PRINT#6
40
PRINT#6;"register
one"
50
PRINT#6
60
PRINT#6;"REGISTER
TWO":REM
THIS
TEXT IN
REVERSE
70
PRINT#6
80
PRINT#6;"register
three":REM
THIS
TEXT IN
REVERSE
Notice
that
regardless
of
the
case
specified
in
the
program,
the
messages
on
the
screen
are
all
in
upper
case
and
those
which
would
appear
in
inverse
video
in
mode
0 do
not
do so
in
mode
1.
This
is
because
the
additional
information
which
would
affect
case
and
inverse
video
in
mode
0,
is
used
to
select
one
of
four
colour
registers
to
determine
the
colour
of
the
characters.
The
following
table
shows
which
registers
are
selected
by
which
type
of
text.
Characters
can
be
positioned
on
the
mode
1
and
2
screens
using
the
POSITION
command
as
in
mode
0,
but
remember
that
because
the
characters
are
larger
than
those
in
mode
0,
the
limits
of
screen
coordinates
are
correspondingly
reduced.

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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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