How do I get composite
video from my 4-switch Atari 2600?
Glad you asked!
To get composite video from an Atari 2600, you will need:
A 22-ohm resistor.
The components to get composite video hook up to the same spots on the Stella chip on all three model Ataris. But in each model, the Stella chip is in a different position, so the pins aren't in the same place all the time. Also the CHROMA lead is in a different place on each model.
Flip the 4-switch Atari 2600 board over, and look in the lower left-hand corner, well, about 3.25 inches from the left-most edge. You should see something that looks like this...
The audio signal comes from the junction of resistor 206 and capacitor 208. To make it work, connect the wire to the center tap of an RCA phono plug. Then, connect the outer edge of the RCA plug to the ground of the Atari board. To get ground, connect it to any spot on the Atari circuit board that touched the metal shield. (anywhere on the metal band that goes around the edge of the circuit board)
Take a look at this. Here are which pins are which on the 4-switch Atari 2600's Stella chip.
Here is a super-high-tech schematic of how to hook up the rest of the video:
To make it work, hook the composite video lead into the center tap of an RCA phono plug. Now attach a wire to the outer side of the RCA plug. Connect this wire to the Atari's ground.
Now if you plug in a video cable and attach it to a monitor, you will have VIDEO! Yahoo! Adjust the potentiometers until the video looks right. Use a game like Pitfall that has a lot of color for a good calibration.