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After Hours

Cracking Open the Atari 2600 video game console

By Mark W. Kaelin April 17, 2008, 7:11 AM PDT

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Cracking Open the Atari 2600 video game console

Oh boy, Space Invaders!

Oh boy, Space Invaders!

Introduced all the way back in October 1977, The Atari 2600 Video Computer System is one of the more fondly remembered video game consoles. For its time, the Atari 2600 was a breakthrough in entertainment technology and foreshadowed what would eventually become a multi-billion dollar industry. In this TechRepublic Cracking Open, we take a look at what made the Atari 2600 tick.

Cracking Open the Atari 2600 video game console

Nothing fancy

Nothing fancy

The Atari 2600 is held together with a set of Phillips head screws. Just about every hole on the back of the unit has a screw in it.

Cracking Open the Atari 2600 video game console

Washers

Washers

A couple of the screws even have washers.

Cracking Open the Atari 2600 video game console

An old friend

An old friend

Look, it is our old friend the ribbon cable.

Here’s a question for the engineering crowd: When was the ribbon cable introduced?

Cracking Open the Atari 2600 video game console

Major part one

Major part one

The circuit board holding the switches is mostly nondescript in terms of notable features. The silver box in the right corner houses the circuitry that creates our standard video/audio RF signal.

Cracking Open the Atari 2600 video game console

Plastic housing

Plastic housing

Not much to see in the plastic housing. One note of speculation that might warrant discussion though.

John Sheesley of the Classics Rock blog wondered if the two three-pronged housings were designed to hold speakers? It certainly appears that they could and there are slits in the top of the case which fit the pattern of allowing sound to emanate from the unit. Did future versions of the Atari console have speakers?

Cracking Open the Atari 2600 video game console

The meat

The meat

We haven’t really seen much in the way of chips yet. The must all be housed in this cocoon of metal.

Cracking Open the Atari 2600 video game console

We have circuit board

We have circuit board

The metal box opens to reveal the underside of a circuit board.

Cracking Open the Atari 2600 video game console

More paper

More paper

It is very odd to see a single piece of paper taped to the underside of a circuit board. Again, I am wondering if this perhaps a serial number?

Cracking Open the Atari 2600 video game console

Oil pan

Oil pan

The metal case reminds me of the leaking oil pan from my first car — a 1972 Chevy Nova Coupe, orange with white pin stripes. But I digress…

Cracking Open the Atari 2600 video game console

Here is where it happens

Here is where it happens

Here is the main circuit board of our Atari 2600.

Cracking Open the Atari 2600 video game console

Sound and video

Sound and video

Using the technical information found at ClassicGaming as a reference, the circled chip should be part of the sub-system where sound and video get processed along with interaction with the paddles and joystick ports.

Cracking Open the Atari 2600 video game console

Atari chip

Atari chip

This chip has Atari’s logo and is part of the sub-system that processes the interface interaction with the switches and the game cartridge. This chips also houses 128 bytes of RAM. That is BYTES not kilobytes.

Cracking Open the Atari 2600 video game console

Insert here

Insert here

The game cartridge has taken some abuse over the years it appears.

Cracking Open the Atari 2600 video game console

Cartridge reader

Cartridge reader

A close look at the input/output chip.

Cracking Open the Atari 2600 video game console

Mystery

Mystery

Here is a closer look at the CPU. Also take note of the handwritten 3. Is that room for another chip?

Cracking Open the Atari 2600 video game console

Backend

Backend

The joystick ports and the power adapter plug.

Cracking Open the Atari 2600 video game console

Oops!

Oops!

The pins on this ribbon cable are very fragile and I bent a few during the cracking open. Luckily the pins went back in place with minimal effort.

Cracking Open the Atari 2600 video game console

Adjustments

Adjustments

The orange piece pictured here adjusts the gain on the sound output — at least as far as I can tell. If you have a better idea, please share it.

Cracking Open the Atari 2600 video game console

Adjustment

Adjustment

The output from the Atari 2600 is your basic radio frequency signal carried along a wire via RCA connections. The tunning is set for channel 3 on a standard television. Apparently, that channel can be fined tuned, perhaps even changed to a different channel. In later models, Atari allowed the user to choose between channel 3 or 4.

Cracking Open the Atari 2600 video game console

All to pieces

All to pieces

The Atari 2600 in all its Cracked Open Glory.

I never owned one of these consoles — I was an Intellivision II man (George Plimpton convinced me it was better). Do you still play your Atari 2600?

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By Mark W. Kaelin
Mark W. Kaelin has been writing and editing stories about the information technology industry, gadgets, finance, accounting, and tech-life for more than 25 years. Most recently, he has been a regular contributor to BreakingModern.com, aNewDomain.net,
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