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refactored memory so RAM just subclasses ROM, adding write_byte

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James Tauber 2011-08-13 09:47:18 -04:00
parent 6b163f1c2d
commit f3e0cef441
1 changed files with 10 additions and 28 deletions
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38
applepy.py
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@ -238,28 +238,31 @@ class Display:
del pixels
class RAM:
class ROM:
def __init__(self, start, size):
self.start = start
self.end = start + size - 1
self.__mem = [0x00] * size
self._mem = [0x00] * size
def load(self, address, data):
for offset, datum in enumerate(data):
self.__mem[address - self.start + offset] = datum
self._mem[address - self.start + offset] = datum
def load_file(self, address, filename):
with open(filename) as f:
for offset, datum in enumerate(f.read()):
self.__mem[address - self.start + offset] = ord(datum)
self._mem[address - self.start + offset] = ord(datum)
def read_byte(self, address):
assert self.start <= address <= self.end
return self.__mem[address - self.start]
return self._mem[address - self.start]
class RAM(ROM):
def write_byte(self, address, value):
self.__mem[address] = value
self._mem[address] = value
class SoftSwitches:
@ -297,27 +300,6 @@ class SoftSwitches:
return 0x00
class ROM:
def __init__(self, start, size):
self.start = start
self.end = start + size - 1
self.__mem = [0x00] * size
def load(self, address, data):
for offset, datum in enumerate(data):
self.__mem[address - self.start + offset] = datum
def load_file(self, address, filename):
with open(filename) as f:
for offset, datum in enumerate(f.read()):
self.__mem[address - self.start + offset] = ord(datum)
def read_byte(self, address):
assert self.start <= address <= self.end
return self.__mem[address - self.start]
class Memory:
def __init__(self, display=None):
@ -757,7 +739,7 @@ class CPU:
self.ops[0xF9] = lambda: self.SBC(self.absolute_y_mode())
self.ops[0xFD] = lambda: self.SBC(self.absolute_x_mode())
self.ops[0xFE] = lambda: self.INC(self.absolute_x_mode())
def reset(self):
self.program_counter = self.memory.read_word(self.RESET_VECTOR)