def execute(self, opcode):
(_, x_reg, y_reg, _) = get_opcode_digits(opcode)
if self.registers.v[x_reg] != self.registers.v[y_reg]:
self.program_counter.skip()
else:
self.program_counter.next()
def execute(self, opcode):
(_, reg, _, _) = get_opcode_digits(opcode)
value = opcode & 0x00FF
if self.registers.v[reg] == value:
self.program_counter.skip()
else:
self.program_counter.next()
def emulate_cycle(self):
opcode = int.from_bytes(self.memory.get(self.program_counter.value, 2),
byteorder='big')
(first_digit, _, _, _) = get_opcode_digits(opcode)
opcode_set = self.op_table[first_digit]
opcode_set.execute(opcode)
self.timers.tick()
def execute(self, opcode):
(_, reg, _, opcode_end) = get_opcode_digits(opcode)
key_num = self.registers.v[reg]
is_pressed = self.keypad.is_pressed(key_num)
if (opcode_end == 0xE):
self.conditional_skip(is_pressed)
else:
self.conditional_skip(not is_pressed)
def execute(self, opcode):
(_, x_reg, y_reg, last_hex_digit) = get_opcode_digits(opcode)
x_value = self.registers.v[x_reg]
y_value = self.registers.v[y_reg]
if last_hex_digit == 0x000E:
op = self.shift_left_8xxE
else:
op = self.operation_table[last_hex_digit]
op(x_reg, x_value, y_value)
def execute(self, opcode):
(_, x_coord, y_coord, height) = get_opcode_digits(opcode)
self.registers.v[15] = 0
for line_num in range(height):
sprite_line = self.memory.get_byte(self.registers.i + line_num)
collision = self.graphics.set_sprite_line(x_coord,
y_coord + line_num,
sprite_line)
if collision:
self.registers.v[15] = 1
self.program_counter.next()
def execute(self, opcode):
(_, reg, _, _) = get_opcode_digits(opcode)
value = opcode & 0x00FF
self.registers.v[reg] = (self.registers.v[reg] + value) % 256
self.program_counter.next()
def execute(self, opcode):
(_, reg, _, _) = get_opcode_digits(opcode)
val = opcode & 0x00FF
self.registers.v[reg] = val & random.randint(0, 255)
self.program_counter.next()
def execute(self, opcode):
(_, x_reg, _, _) = get_opcode_digits(opcode)
opcode_end = opcode & 0x00FF
op = self.operation_table[opcode_end]
op(x_reg)