Atari 800XL Field Service Manual

MECHANICAL THEORY
Th* itOOXL
cornpuler
console Contains
«
single motherboard
which hoisei all
the
chips
of
the fystcrn ^rtd provides
corviectori for
interfacing eiftfrnaJ modules
to the
console.
It includes
the
CPU, RAM, OS and BASIC ROM's,
The motf.etroard
usrs
a
common adAess bus,
data
bus and clock Mnes* The
sirteen-line address bus
allows
the micjopf
ocessor to directly address t'lK
memoTY
locations.
The eight-line
data
bus
provides
the communication and data path between
the fif^ctianaJ modules.
The power is
provided
by an exlernal
power
supply
and rouied
throughout
the
console*
Th A1B/-I
Cat
tfldft
I
Ta
Jofiikk*.
PfttMicft,
etc
CarlrMl*
BASIC
f(OU
[
1
Cnntiolkr
Poru
OfiVf
lUnf
AOU»
Ta DU^
Pr]^t*f«,
CPU
CkculiTf
Clrctilu-yJ
PcDCEuInf
Orciiiry
1ahtic/;tia
CkodlTf}
J
SIO
ICpjr
board
with
huiMm
Video
ModuUu
TcWfUkm
SOOXL Computer
Field Service Manual
Fig l-I. System
Block Diagram
1-2

Atari 800XL Specifications

General

Manufacturer	Atari
Type	Home computer
Release year	1983
CPU	MOS Technology 6502C
RAM	64 KB
ROM	24 KB
Operating System	Atari OS
CPU Speed	1.79 MHz (NTSC) / 1.77 MHz (PAL)
Graphics	ANTIC and GTIA chips
Display resolution	160×192 to 320×192 pixels
Sound	POKEY chip
Storage	Cassette tape, floppy disk
Ports	Serial, parallel, monitor, joystick ports