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Atari 5200 Xevious Crashing Bug


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As some of you may know, the Atari 5200 version of Xevious has a nasty crashing bug.  Almost every version of the game will crash shortly after you reach the second Nazca bird glyph.  Out of the six versions of Xevious I have access to, only the earliest (10-13) does not have this bug.  I've read that the 11-28 version also does not have this bug, but I don't have that rom.  Oddly enough the last known version (1-4-84) also has this bug even though it was apparently fixed in the 11-28-83 version.  Can someone analyze this prototype and see what causes this crash? 


I can provide the six prototypes I have and two save states (compatible with Atari800 emulator) to help since the game is HARD and it take a while to get to the second bird.  These save states are for the 1-4-84 prototype with the crash.  One is shortly before the crash and the second one is a second or so before it crashes.


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