Oh, darn! Now I'm gonna have to tear the unit back open and do THIS mod, too!
Seriously, though, if you wouldn't mind sharing how this is done, maybe with photographs, that would be GREAT!
I assume that this is just the standard stero mod for an ATARI 2600, where you lift pins 12 and 13, attach the appropriate resistors and capacitors, and send it to the LEFT/RIGHT audio jacks?
Here's some of those stereo mods I have done recently, one that I did directly near/on the TIA chip, and then one where I used a "sub-board" under my video mod board - -
(Don't mind the leads on the resistors and caps, they don't touch, and are actually very far away from each other, but the perspective in these shots skew the appearance)
(The stereo mod is the smaller per-board under the larger one, and is the same setup as the last photo, just on perf board)
The details on the Ballblazer and Commando sounds issues and solutions would be most helpful . . . those are the two carts that use POKEY sound. It sounds like you take some leads from the correct trace on the cartridge slot where POKEY sounds comes from, and link those to the LEFT/RIGHT jacks as well? And, there might be some caps and resistors that would be needed for that mod, too?
All in all, very cool to know - - it seems that ATARI 7800 programmers once again, like the 2600, HAD stereo programmed into their games, but the console did not have the right outputs to implement it! Fascinating!
I wonder what other 7800 games take advantage of stereo sound?
Thanks!
-a2a