Atari 800XL

The
cartridge
interface
connects
cartridges
to
the
computer
with
a
30-
pin
connector.
The
Atari
800XL
has
Revision
B of
Atari
BASIC
built-in.
This
is equivalent
to
having
a BASIC
cartridge
"permanently"
plugged
into
the
console.
When
any
cartridge
is
plugged into
the
computer,
it takes
precedence
over
the
built-in
BASIC.
This
is a function
of hardware.
When no
cartridge
is
plugged
in,
the
hardware
enables
the
built-in
BASIC.
BOTTOM
Cartridge
Connector
Pin Assignments
21