Atari 2600 Field Service Manual

Figure 4-4. Gray Bars Screen
The gray bars screen has eight horizontal shaded bars.
It is normal for the bars to
have some uneven areas on their upper and lower edges.
The bars must appear (in
descending order) as going from black to white in even steps.
The screen may not have
any color
in it. All eight bars must be consistent in their shade across the entire bar.
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- -
lhe area of the screen outside the bars is irrelevant.
The white line immediately
above the top bar (black) is normal. This screen
tests the operation of the chip set,
especially the TIA
(A202).
2500/2600A Domestic VCS
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Atari 2600 Specifications

General

Manufacturer	Atari, Inc.
Release Date	September 11, 1977
CPU	MOS Technology 6507
CPU Speed	1.19 MHz
RAM	128 bytes
Graphics	Television Interface Adaptor (TIA)
Media	ROM cartridge
Successor	Atari 5200
Colors	128
Sound	2 channels
ROM	4 KB
Controller Input	Joystick