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added wrap-around for zero_page_x_mode

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James Tauber 2011-08-06 18:08:39 -04:00
parent fef234f7c0
commit 3344005fe7
1 changed files with 1 additions and 1 deletions
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applepy.py
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@ -328,7 +328,7 @@ class CPU:
return self.read_pc_byte() return self.read_pc_byte()
def zero_page_x_mode(self): def zero_page_x_mode(self):
return self.zero_page_mode() + signed(self.x_index) return (self.zero_page_mode() + signed(self.x_index)) % 0x100
def indirect_mode(self): def indirect_mode(self):
return self.memory.read_word(self.absolute_mode()) return self.memory.read_word(self.absolute_mode())