was almost going to give up on the Atari 2600 e7 cart nonsense, but thought of one more thing to try.
If it's possible the E7 chip is messing with the data bus (D7..D0) but doesn't really need it, why not just not let it have access to that?
so I made a custom socket with the D lines not there...
here it is with the e7 chip in place
finally, a picture of the "floating bus"
OK that sounded funnier in my head
and, beyond all hope, it worked! First with the test cart.
Then with Myst! (after I accidentally put the EPROMs in upside down, miraculously it didn't die after that)
after all this time, Myst running natively from vintage 1980s hardware. And as far as I can tell maybe I am the first person ever to run a full 2k-RAM E7 mapper game on real hardware w/o an emulator
