[atari7800] Question about encryption area

Hi all,
In the 3600 documentation it says that 128 bytes from $FF7A - $FFF9 should be 
set to zero for the data encryption. I've noticed in the sample code that's 
been supplied here that not all this area is reserved. Is it a must that it has 
to be reserved? I think Eric reserves this area starting at $FF80.
I also see in Dan Boris' examples he has $FF at $FFF8 for region verification. 
What is this? And the next byte is the MSB of where the ROM starts + 7 
:confused: Does all this get done automatically by 78sign?
Another question...I ran Joust through Distella and it has $E7 in $FFF9 but the 
ROM starts at $8000. Shouldn't $87 be in location $FFF9?
Please understand that I'm running these samples through an emulator (MESS) and 
they run fine. I don't know what happens on the real hardware. I missed out on 
the CC2 run :-(
Take care,
Dennis

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