Atari 800XL Field Service Manual

CaoUNO
A[phar»um>
Pita.
Alphau^um*
Data
AlphA/ium, Data.
(SY5
R5T>
tnTcrrupt
Ojtput
HALT
Ad':irE^3
Sui
Addrp:^
Buj
Adctcra
3«j
ArfrtrcTi
5uJ
Re
id/^nta
RrAxiy
Ouiptit
Arfdrc^
Bia
Adrfrc^
Bm
Addr==3
Buj
Addr«3
Bui
Addrr^
BuJ
VSS
ANi
ANl
HAiTf
A3
A2
Al
Al
R/5
ROY
AlO
Al2
A13
Al*
Al5
D3
Hi
R:>r
FOO
C>0
D3
D2
Dl
ci
02
A*
AJ
A6
A7
AS
A9
All
VCC
CAta
5iu
C4ta Bijs
Cats
3us
?V^_^
Cl>dc
Cara
Btn
Cd-:a
Bus
^j^ 2
CL>ck
Add,—c3
?-a
Arfr^ir^
Adl
Addr-
Addr-
Adrir
Addr-
B-a
BuJ
Bin
Sua
FigiiTc
i-f*- ANIIC Dbpla)^
Proc^^or
Pin
Assignments
Graphic
Television
Interface
Adaptor (GTIA)
The
GTIA
Inlf-rfaces
with
the
ANTIC procri^^or on
one
side ^nd
with the
video
summation
rircuitry on the
other-
Its
primary
tasW
is
to
gmerate
color
and
luminance
signals
from the
bit stream it
receives
from the
ANTIC
Display
Processor,
It aiso
processes
(he Function
Weys,
provides t!ie
keyboard
"beep"
via
the TV
5peak<?r
and monitors
controller
Trigger lines.
Figure
1-5
U
an
illustration
of
the
GTTA pin
assignments.
SOOXL Computer
Fielrf
Service
Manual
1-6

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