def given_register_pair_contains_value(self, register_pair, value):
if register_pair == 'sp':
self.processor.special_registers['sp'] = value
elif register_pair[0] == 'i':
self.processor.index_registers[register_pair] = value
else:
high_byte, low_byte = high_low_pair(value)
self.processor.main_registers[register_pair[0]] = high_byte
self.processor.main_registers[register_pair[1]] = low_byte
def execute(self, processor, memory, pc):
old_index = self.processor.index_registers[self.indexed_reg]
self.processor.index_registers[self.indexed_reg] = big_endian_value([
self.memory[self.processor.special_registers['sp']],
self.memory[0xffff & (self.processor.special_registers['sp'] + 1)]
])
high_byte, low_byte = high_low_pair(old_index)
self.memory[0xffff & self.processor.special_registers['sp']] = low_byte
self.memory[0xffff
& (self.processor.special_registers['sp'] + 1)] = high_byte
return 23, False, pc
def execute(self, processor, memory, pc):
high_byte, low_byte = high_low_pair(self.processor.index_registers[self.indexed_reg])
self.processor.push_byte(high_byte)
self.processor.push_byte(low_byte)
return 15, False, pc
def given_alt_register_pair_contains_value(self, register_pair, value):
high_byte, low_byte = high_low_pair(value)
self.processor.alternate_registers[register_pair[0]] = high_byte
self.processor.alternate_registers[register_pair[1]] = low_byte
def execute(self, processor, memory, pc):
high_byte, low_byte = high_low_pair(
self.processor.index_registers[self.indexed_reg])
self.processor.push_byte(high_byte)
self.processor.push_byte(low_byte)
return 15, False, pc
def execute(self, processor, memory, pc):
dest_address, pc = fetch_word(memory, pc)
high_byte, low_byte = high_low_pair(self.processor.index_registers[self.indexed_reg])
self.memory[0xffff & dest_address] = low_byte
self.memory[0xffff & (dest_address + 1)] = high_byte
return 20, False, pc
