Dbug wrote on 29.03.09 at 12:03:57:

Instead of simply drawing in a back-buffer and swapping the screen address, the code actually draws in a temporary buffer, and then draw it on the back-buffer. When the protection triggers, the copy is reversed so you have the screen mirrored.

LOL. I read on another forum that he was pretty smug about performance and did everything possible to make it run on an ST. So maybe if I remove that bit of code it might run full frame on a TT (it's almost there atm :))