Overview; Model 5200 Console; Four-Port Universal Pcb Differences - Atari CX 5200 Field Service Manual

SECTION
1
THEORY OF
OPERATION
Overview
The
ATARI
Advanced
Video Entertainment System (Model 5200)
is
an
advanced
microcomputer.
It
receives input
from
the
game
controllers,
Read-Only-Memory
(ROM)
cartridges
and
other
peripherals,
and
displays this input
on a T.V. screen.
A
maximum
of four players
may
play at
one
time.
The Model
5200
is
composed
of
the console,
switchbox and
game
controllers.
The
following
paragraphs provide a general
discussion of
each
of
these items and
their
component
parts.
For a
detailed discussion of the
Game
Controller see
SECTION
6.
Model 5200
CONSOLE
The Model
5200 console
is
composed
of an outer plastic
case which houses
the
PC
board and
its
RF
Shield.
Figure
1-1
shows
the
console and
its
parts.
There are currently three different
PC
Boards being used
in
Model 5200
consoles.
Some
models contain the
original 4-port
PC
Board,
number CA01
8087.
Other
consoles
contain a 4-port universal
PC
Board,
number CA020108.
A
third
PC
Board
with only
two
player
ports,
number CA021374,
is
also available.
Unless otherwise
specified,
the
references
in
this
manual
pertain to the
original
4-port
PCB, number
CA018087. The
specific differences
of the 4-port
universal
PCB
and the 2-port
universal
PCB
are
called
out below.
Four-Port Universal
PCB
differences:
External
The
ATARI
serial
number on
the
bottom
of the unit will
have a
+ as
its
third
designator. For example:
CITE
CODE
DATE
A T
|
2
1
3
4-PORT
DESIGNATOR
The
chip designators
have been changed.
All
chips are designated
A
instead of U.
Internal
1)
2)
Two
74LS244 ICs (U4
and U15)
were removed
from
the
PC
Board.
3)
Two
74LS244
ICs (U14 and U28)
were
replaced with a 74LS125
(A14) and a
74LS51
(A15).
4)
Provisional circuitry for future expansion has been added
in
order to
accommodate
the
VCS^M
cartridge adaptor.
CX5200
Field
Service
Manual
Changed
by
ECN
#0036
6/21/83