Also, the MegaFlash will accept write operations both in the C000-FFFF and 8000-BFFF ranges because of an hardware limitation. So, avoid reading and writing to 8000-BFFF while trying to program a ROM. We're sorry for the inconvenience, but fixing that would require an extra chip on the board, a bigger board, and more complex wiring which we tried to avoid.
The newer batch of the FlashGordon does decode A14, which is an great advantage over the MegaFlash, because you can use the stack at the place where it's usually located.