Atari 800XL

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