[fallat]

> You need to do mid-frame tile updates just to show a full bitmap frame.

Right!

> So the mid-screen update is to go from one tile dictionary to the other

Yes

I guess I'm missing something here, but I remember doing this myself like 15 years ago

[whizzter]

Perhaps it was about full-screen-bitmap(hblank tile-address/mapping switching) rather than full-screen-bitmap-animation?