Atari 2600 Diagnostics Cartridge

Test Cart ROM
Released to repair facilites only
Owner and dumper unknown.

What the hell? I always thought these diagnostics cartridges were supposed to be easy to use?

Oh well, whatever. This is the only 2600 Test Cart that I've come across so far, and also one of the most difficult that I've ever seen as far as usage is concerned. Now to be fair, this cart probably came packaged with a nice thick book describing its exact use, what all the different functions of the Atari 2600 did to the cart, and how to repair them. However, until such a book surfaces and is released onto the internet, you're stuck with me doing my usual half-assed blind experimentation with Stella to see how to get this puppy running.
With every controller movement and button press, different bars on the screen will turn on and off. Both player one and player 2 controllers are tested by this cart. It's possible that this may alson test the paddle controllers, however, due to the limitations of MacStella, I was not able to test that. Pressing the Color/B&W switch will flip between the normal screen and a B&W test pattern. Also, by flipping the player 1 difficulty switch, you can test the sound channels by setting off what appears to be an air raid siren. Be careful if you're doing this at night tho, this is LOUD!
Well, it's not a whole heck of a lot more than your average test cart. I did get quite a surprise when I was first testing this game at about 3am and managed to find the cart's built in air raid siren - it sent me jumping out of my chair and sent a fluttering, screeching ball of feathers flying across the room that was a moment before that my happily sleeping parakeet that was on top of my computer. Use it late at night to scare your family and friends!

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