>> The key was supposed to be all FFs when sent to Atari. Not sure
>> what region the key routine scans though. ($x000-$FF7F or $x000-$FFFF)
>From looking at the BIOS source, the regions used were....
$x000-$FEFF
$FF00-$FF7F
120 byte gap for key
low byte of 'start of authentication' not checked. (really really subtle
bit checking done here. probably why. also, the auth key starts looking at
the start of the page AFTER the start of code. if start of code points to
$E287, the authentication routine will start looking at $E300. this
intervening space is calculated as $00 for purposes of the hash)
$FFF9-$FFFF
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