SECTION
1
THEORY
OF
OPERATION
There are currently four types of ATARI Video Computer Systems. The original model
(2600) is composed of two
PC
Boards connected by a 12-pin ribbon cable with the
motherboard surrounded by a heavy aluminum casting.
The
other models (2600A: Revisions 1-13, Revisions 14-15, and Revisions 16
and up)
are composed of a single board with
a
light aluminum shield. The single board models
differ slightly in the video output circuitry.
Component differences are:
Revisions 1-1
3
have no diodes on TIA lines LA41 and Sync.
a
Revisions 14-15 have diodes and pull-up resistors on TIA lines LMl
and
Sync.
e
Revisions 16
and
up include the above mentioned diodes and resistors
as
well as
a
timer chip.
The revision level
is
etched directly on the
PC
board.
OVERVIEW
The ATARI Video Computer System (VCS) Models 2600/2600A are state-of-the-art
microcomputers. They receive instructions for the operation of different games from
individual Read-Only-Memory game cartridges and interpret data from the players'
hand-held controllers. They
also
allow game players to select both a specific version
of
each
game and the player difficulty (on a per player basis). Figure
1-1
is
a
block
diagram of the functional flow of the
VCS
Model 2600. Section
7
describes the player
controllers.
-
.
brar
Ellmcutor
(AX,
Adwmrt
120
VAC
Figure
1
-1.
2600
Functional Diagram
2600/2600A Domestic
VCS
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