Atari 2600 Field Service Manual

Figure 4-9. Audio Tone Test Screens
The
test displays two alternating patterns on the screen (as shown in Figure 4-9) while
two alternating tones are heard.
The tones
change in sync with the screen. This test
pattern continues for one full cycle after the Right Difficulty switch has been
switched to stop the test.
2600/2600A Domestic VCS

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