Apple-2-Tools/applepy
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don't treat indices as signed in indexed addressing modes (ht: ghewgill)

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This commit is contained in:
James Tauber 2011-08-07 06:42:47 -04:00
parent 4177ae0b25
commit 6525a27511
1 changed files with 6 additions and 6 deletions
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applepy.py
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@ -631,28 +631,28 @@ class CPU:
return self.read_pc_word()
def absolute_x_mode(self):
return self.absolute_mode() + signed(self.x_index)
return self.absolute_mode() + self.x_index
def absolute_y_mode(self):
return self.absolute_mode() + signed(self.y_index)
return self.absolute_mode() + self.y_index
def zero_page_mode(self):
return self.read_pc_byte()
def zero_page_x_mode(self):
return (self.zero_page_mode() + signed(self.x_index)) % 0x100
return (self.zero_page_mode() + self.x_index) % 0x100
def zero_page_y_mode(self):
return (self.zero_page_mode() + signed(self.y_index)) % 0x100
return (self.zero_page_mode() + self.y_index) % 0x100
def indirect_mode(self):
return self.memory.read_word_bug(self.absolute_mode())
def indirect_x_mode(self):
return self.memory.read_word_bug((self.read_pc_byte() + signed(self.x_index)) % 0x100)
return self.memory.read_word_bug((self.read_pc_byte() + self.x_index) % 0x100)
def indirect_y_mode(self):
return self.memory.read_word_bug(self.read_pc_byte()) + signed(self.y_index)
return self.memory.read_word_bug(self.read_pc_byte()) + self.y_index
def relative_mode(self):
pc = self.get_pc()