Atari 800XL Field Service Manual

RF
MODULATOR
Thf RF
modulator
arcr^pts tV^f composite
v]dro from
thr video summation
cirojltry
arxJ the mono-aural audio signals
and produces a
modulated
signaJ suitable
fof
the
television*
Vith
a
73 Ohm
termination, the
modulated signal has
the followmg
character istics:
Maximum Voltage:
2MV
Minimum Voltage:
IMV
Audio Sound Carrier Frequency: ^.5 MHz
Fiequency Response;
Channel
2
-
Band: 6 MHz
Video Carrien
55,25 MHz
Audio Carrier:
59.75
MHz
Channel
3
-
Band:
6
MHz
Video Carrien 6L25 MHz
Audio Carrier: 63.75
MHz
MONITOR OUTPUT
The
5
pin DIN monitor
output jack (J2) accepts the
composite
video ar«l the
composite luminance signals
from the GTIA video
summation circuitry
and the
amplified mor>o-airaI audio
signals from
POKEY. 32
then
transfers these
signals
directly to the input
of the
video
monitor via
a
5 pin DIN
monitor cable.
L
The output signals have
the
following
characteristics:
Min. Voltage
Max.
Voltage
Composite
Video
750 MV P-P I
V P-P
Composite Luminance 1.2V
P-P
L5V P-P
Audio
600
Mv
P-P 750
Mv P-P
POWER SUPPLY
The power
simply
connector is
a
7-pin DIN
connector.
The Atari 800XL
has
an
erternal power supply
that accepts
110
VAC (nominal)
from the
power
lines and provides S
VDC
output
(/- 2%),
The maximum
rating
for
the supply
is
«
5
volts
and 1 .2 amps.
800XL Computer
l-IO
Field
Service
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