Atari 2600 Field Service Manual

KEY BOARD CONTXOLLER
The keyboard controller (Figure 7-71 is a 12 button calculator-type switch array that
functions like
a small computer keyboard. When one of the pushbuttons is pressed, the
corresponding set
of sense lines is closed, completing the circuit. The closure is
detected by
the 6532 and appropriate action is taken by the program. Figure 7-8
illustrates the keyboard wiring and Figure 7-9 the keyboard schematic.
Figure 7-7. Keyboard Controller
2500/2600A 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