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from ..emu import Machine
from .utils import make_rom
def test_alr_s0_small_unsigned():
machine = Machine()
rom_image = make_rom([0b0000_010_000_001_000]) # ALR target=RC left=RA right=RB alu_code=0
machine.load_rom_image(rom_image)
machine.reset()
machine.ra.value = 10
machine.rb.value = 20
machine.run()
machine.step()
assert machine.rc.value == 30
assert machine.fr.carry == 0
assert machine.fr.overflow == 0
assert machine.fr.zero == 0
assert machine.fr.sign == 0
def test_alr_s0_large_unsigned():
machine = Machine()
rom_image = make_rom([0b0000_010_000_001_000]) # ALR target=RC left=RA right=RB alu_code=0
machine.load_rom_image(rom_image)
machine.reset()
machine.ra.value = 0xFFFF
machine.rb.value = 20
machine.run()
machine.step()
assert machine.rc.value == 19
assert machine.fr.carry == 1
assert machine.fr.overflow == 0
assert machine.fr.zero == 0
assert machine.fr.sign == 0
def test_alr_s0_small_signed():
machine = Machine()
rom_image = make_rom([0b0000_010_000_001_000]) # ALR target=RC left=RA right=RB alu_code=0
machine.load_rom_image(rom_image)
machine.reset()
machine.ra.value = 0xFFFF # -1
machine.rb.value = 0x0001 # 1
machine.run()
machine.step()
assert machine.rc.value == 0
assert machine.fr.carry == 1
assert machine.fr.overflow == 0
assert machine.fr.zero == 1
assert machine.fr.sign == 0
def test_alr_s0_large_signed():
machine = Machine()
rom_image = make_rom([0b0000_010_000_001_000]) # ALR target=RC left=RA right=RB alu_code=0
machine.load_rom_image(rom_image)
machine.reset()
machine.ra.value = 0x7FFF # 32767
machine.rb.value = 0x0001 # 1
machine.run()
machine.step()
assert machine.rc.value == 0x8000 # -32768
assert machine.fr.carry == 0
assert machine.fr.overflow == 1
assert machine.fr.zero == 0
assert machine.fr.sign == 1
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