Atari 2600 VCS

Made in USA by Atari in 1977
Generation: 2
Units sold: 40000000
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# - official description - Service Manual
VCS means Video Computer System

Later Models were called Atari 2600

This console has no video frame buffer to feed the graphics to the display at the right time. So programmers had to use machine code to do it. This code for the display had to match the timing of the TV with no option to wait. Game logic need to happen in-between the display code. Running necessary game code in-between the display code was know as "racing the beam" since they were littering trying to make things happen before the electron beam in a TV advanced to the next pixel. An advantage to these difficulties it that programmers are free to use as many colors as they want, although this requires CPU cycles and leaves even less time to run game code. The Atari is technically limited to 56 colors per scan line, but 2 is a more practical limit. The pallet is limited to 128 colors. However, color limited are not insurmountable and 256 colors have been successfully displayed from a VCS.

Two portable clones of this console exist :
- Akor TV Boy released in 1991 in Hong-Kong (TV required)
- Dynacom MegaBoy released in 1991 in Brazil (built-in screen)
These two clones include 126 games but don't have any cartridge port.

Authorized clone from Sears (Sears Video Arcade):

Atari made an adapter to play 2600 games in the 5200. The adapter is actually a 2600 system (virtually all 2600 adapters are).

Other Clones:
Columbia Home Arcade
Coleco Gemini
Dynacom Dynavision
Goliath Game System
Intellivision System Changer (Intellivision adaptor)
CCE Supergame VG-2800
CCE Supergame VG-3000
RetroN 77

tech info

resolution: 160 x 195 x 16 colors
memory: 128 Bytes RAM, 6K ROM
CPU: 6507 1.19 MHz
GFX: Stella 1.19 MHz
sound: 2 channels mono

Related systems

Atari 2600 VCS1977
Atari 400/8001979
Atari 52001982
Atari ST1985
Atari 78001986
Atari ATW8001988
Atari Lynx1989
Atari Falcon1992
Atari Jaguar1993