Atari 800XL Field Service Manual

ELECTRICAL
THEORY
DlCriAL MAPOa'ARE
TJir
digital h^/dwATp
contriti
ol;
O
Tt>r
6?0?C
CPU rnfrjO[>rori-^^of
Th^ AlphAH^jncric Television Inltrfarp
CootrolJrr (AMnC)
D
Thr Craphjc5 Tc!rvii;ion
hiirrf^irr Adapior
(GTIA)
O
The
POT
KF.Yt-iard Inlr^ratrd
CirruJT (PC^KEY)
O
The
Prrjptirral
InT^riAte AHapinr
(PIAJ
T}»r M^mtry (O.5. ROM,
fUK
PAM^ At^ri f^ASIC ROM,
Rev. B)
O
MiscrM^r^eoirs logic
MejTiory MHinHgrrj^rnt
Unit (MMU)
Driay Line
o Parallel
!\u^
rmrrfrice (PBl)
650?C
CPU
MrfToDforg^sor
The
6>02C CPU microproressor
f ont.^ins rrgHtcr 'I**g^, interronnf^ctioni,
arithmetic
logic, contrni
logic, and
^11
rerognizrd
operaTJon rodrs- The
characteristics of the microprocessor
inrlude:
O
RyTe-orientrd
strijctiire
o I
51 oprc><1es
o
Drcimal ar>d
binary arithrr^efic nindri
o
"irven
addressing
mcxies
O
Trvie indrijng
o Stark pointer
o
Two
interrupt
levels
o
6*K address
range
o
tntegraJ clock
circuit
O
Single +5 volt DC
power requirement
Figure
U5 Is an illustration
of the
6502C CPU Pin Assingments.
amXL Computer
Field Vrvke
Manual

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