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slight refactor of update_nz and update_nzc

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James Tauber 2011-08-06 21:05:22 -04:00
parent accc0a60bd
commit 20457db088
1 changed files with 5 additions and 6 deletions
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applepy.py
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@ -348,15 +348,14 @@ class CPU:
#### ####
def update_nz(self, value): def update_nz(self, value):
self.zero_flag = (value % 0x100 == 0) value = value % 0x100
self.sign_flag = (value > 0x7F) or (value < 0x00) self.zero_flag = (value == 0)
return value % 0x100 self.sign_flag = ((value & 0x80) != 0)
return value
def update_nzc(self, value): def update_nzc(self, value):
self.zero_flag = (value % 0x100 == 0)
self.sign_flag = (value > 0x7F) or (value < 0x00)
self.carry_flag = (value > 0xFF) self.carry_flag = (value > 0xFF)
return value % 0x100 return self.update_nz(value)
#### ####