I believe that was an honest mistake. They did not provide a proper A12 signal, and instead probably just floated the cart data bus during TIA/RIOT accesses, and probably didn't realize the compatibility issues with doing so.
It would be nice to know if there are any possible workarounds, though, such as a chip select signal somewhere, and at the very least it would be nice to know that Curt is at least aware of the issue so this design flaw doesn't crop up in potential future Legacy products (like any portables.)
maybe
but why enlistening in a forum if you won`t care to support what you have made?
you on the other side care to answer all the time,
even to newbies like me
about worries for the money deposited, i believe Curt is honest and will eventually comply with all orders
(when we feels like it,of course)