"It’s not actually a cartridge: it’s a circuit board that you plug into the first expansion slot of an Atari 800 in place of the usual 10K ROM board.
Did any unique software or hardware come out of your interview with Dave Comstock?
I noticed he mentions at 31 minutes into Part 1 that Atari had a special cartridge version
of DDT, available to Atari employees only, that ran on an 800. He mentioned that it was
one of the few things he took with him when he left, because it was a necessity for some
things he had done. So, it sounds like he may still have this. Was he ever asked about
dumping this cartridge? Seems like a great thing to have archived. I know I'd love to have
a copy of it.