added wrap-around for zero_page_x_mode

2011-08-06 18:08:39 -04:00 · 2011-08-06 18:08:39 -04:00 · 3344005fe7
parent fef234f7c0
commit 3344005fe7
1 changed files with 1 additions and 1 deletions
--- a/applepy.py
+++ b/applepy.py
@ -328,7 +328,7 @@ class CPU:
        return self.read_pc_byte()
    
    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):
        return self.memory.read_word(self.absolute_mode())