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Atari XL User Manual

Atari XL
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178
The
Ateri
XL
Handbook
Bit
5
must
be
set
to 1 to
switch
ANTIC
on -
otherwise
there
will be no
display
at
all.
Bit
4
is
set
to 1 to
give
players
and
missiles
a
vertical
resolution
of 1
screen
line
to
each
data
line;
and
set
to °to
give
a
resolution
of
two
screen
lines
to
each
line
of
data.
Bit 3 is
set
to 1 to
enable
player
memory
access.
Bi t 2 is
set
to 1 to
enable
missile
memory
access.
Bits
1
and
°
control
the
width
of
the
background
screen.
Set
them
to 0,0 for no
display,
0,1 for a
width
of
32
columns
in
graphics
mode
0, 1,0 for
40
columns
(the
normal
setting)
and
1,1 for 48
columns.
The
value
in
PMBASE
should
be
the
high
byte
of
the
beginning
of
the
player-missile
graphics
data
area.
The
data
area
is
laid
out
as
shown
below.
PMBASE +
768
(384)
PMBASE +
1024
(512)
PMBASE + 1280 (640)
PMBASE +
1536
(768)
PMBASE + 1792 (896)
PMBASE +
2048
(1024)
PMBASE
Player-Missile
Data
Area
Player 3
data
Player 2
data
Player 1
data
Player 0
data
Missile Missile Missile Missile
3
data
2
data
1
data
o
data
Not
used
for
graphics
There
are
two
possible
configurations
of
the
data
area;
which
is
used
depends
on
the
resolution
indicated
by
bit
4
of
the
SDMCTL
register.
If
a

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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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