def test_BVC_backward():
mem = MemoryMock([0x50, 0xF9], start=10)
cpu = CPU65816(mem)
cpu.P = 0b00000000
cpu.PC += 10
cpu.fetch_decode_execute() # -7
assert cpu.P == 0b00000000
assert cpu.cycles == 3
assert cpu.PC == 5 + mem.header.reset_int_addr # 10 + 2 - 7
def test_BVC_forward():
mem = MemoryMock([0x50, 0x05])
cpu = CPU65816(mem)
cpu.P = 0b00000000
cpu.PC += 0
cpu.fetch_decode_execute()
assert cpu.P == 0b00000000
assert cpu.cycles == 3
assert cpu.PC == 7 + mem.header.reset_int_addr # 0 + 2 + 5
def test_BVC_no_branch():
mem = MemoryMock([0x50, 0x05])
cpu = CPU65816(mem)
cpu.P = 0b01000000
cpu.PC += 0
cpu.fetch_decode_execute()
assert cpu.P == 0b01000000
assert cpu.cycles == 2 # no branch
assert cpu.PC == 2 + mem.header.reset_int_addr # 0 + 2
def test_BCC_wrapped_execution():
mem = MemoryMock([0x90, 0x0F], start=0x7FF0)
cpu = CPU65816(mem)
cpu.P = 0b00000000
cpu.PC = 0xFFF0
cpu.e = 0
cpu.fetch_decode_execute() # branches forward
assert cpu.P == 0b00000000
assert cpu.cycles == 3
assert (cpu.PC & 0xFFFF) == 1 # 65520 + 2 + 16
def test_XCE():
mem = MemoryMock([0xFB])
cpu = CPU65816(mem)
cpu.P = 0b00000000
cpu.e = 1
cpu.fetch_decode_execute()
assert cpu.e == 0
assert cpu.P == 0b00000001
assert cpu.cycles == 2
assert cpu.PC == 1 + mem.header.reset_int_addr
def test_xba3():
mem = MemoryMock([0xEB])
cpu = CPU65816(mem)
cpu.P = 0b00000000 # 16 Bit mode
cpu.A = 0x0089
cpu.fetch_decode_execute()
assert cpu.A == 0x8900
assert cpu.P == 0b00000010 # result is based on AL
assert cpu.cycles == 3
assert cpu.PC == 1 + mem.header.reset_int_addr
def test_JMP_abs2():
mem = MemoryMock([0x4C, 0x34, 0x12], 0x7FF0)
cpu = CPU65816(mem)
cpu.P = 0b00000000
cpu.PC += 0x7FF0
cpu.fetch_decode_execute()
print(mem.ram)
assert cpu.P == 0b00000000
assert cpu.cycles == 3
assert cpu.PC == 0x1234
def test_BCC_branch_page_boundary():
mem = MemoryMock([0x90, 0x05], start=253)
cpu = CPU65816(mem)
cpu.e = 1
cpu.P = 0b00110000
cpu.PC += 253
cpu.fetch_decode_execute() # branches forward
assert cpu.P == 0b00110000
assert cpu.cycles == 4 # page boundary crossed in emulation mode
assert cpu.PC == 260 + mem.header.reset_int_addr # 253 + 2 + 5
def test_tcd_negative():
mem = MemoryMock([0x5B])
cpu = CPU65816(mem)
cpu.P = 0b00000000 # 16 Bit mode
cpu.e = 0
cpu.A = 0xF234
cpu.fetch_decode_execute()
assert cpu.cycles == 2
assert cpu.DP == 0xF234
assert cpu.P == 0b10000000 # negative flag
assert cpu.PC == 1 + mem.header.reset_int_addr
def test_tsc():
mem = MemoryMock([0x3B])
cpu = CPU65816(mem)
cpu.P = 0b00000000 # 16 Bit mode
cpu.e = 0
cpu.SP = 0x1234
cpu.fetch_decode_execute()
assert cpu.cycles == 2
assert cpu.A == 0x1234
assert cpu.P == 0b0000000 # no flag
assert cpu.PC == 1 + mem.header.reset_int_addr
def test_DEC_underflow():
mem = MemoryMock([0x3A])
cpu = CPU65816(mem)
cpu.P = 0b00000000 # 16 Bit mode
cpu.e = 0
cpu.A = 0x8000 # -32.768 (MIN INT)
cpu.fetch_decode_execute()
assert cpu.cycles == 2
assert cpu.A == 0x7FFF # 32.767 (Max Int)
assert cpu.P == 0b00000000 # no negative flag
assert cpu.PC == 1 + mem.header.reset_int_addr
def test_INX_Zero():
mem = MemoryMock([0xE8])
cpu = CPU65816(mem)
cpu.P = 0b00000000 # 16 Bit mode
cpu.e = 0
cpu.X = 0xFFFF
cpu.fetch_decode_execute()
assert cpu.cycles == 2
assert cpu.X == 0x0000
assert cpu.P == 0b00000010 # zero flag
assert cpu.PC == 1 + mem.header.reset_int_addr
def test_LDY_const8Bit():
mem = MemoryMock([0xA0, 0x34])
cpu = CPU65816(mem)
cpu.P = 0b00010000 # 8 Bit mode
cpu.e = 1
assert cpu.Y == 0
cpu.fetch_decode_execute()
assert cpu.cycles == 2
assert cpu.Y == 0x34
assert cpu.P == 0b00010000
assert cpu.PC == 2 + mem.header.reset_int_addr
def test_EOR_8Bit_constant_zero():
mem = MemoryMock([0x49, 0xFF])
cpu = CPU65816(mem)
cpu.P = 0b00100000 # 8 Bit mode
cpu.e = 0
cpu.A = 0xFF
cpu.fetch_decode_execute()
assert cpu.cycles == 2
assert cpu.A == 0x00
assert cpu.P == 0b00100010 # zero flag
assert cpu.PC == 2 + mem.header.reset_int_addr
def test_ORA_16Bit_constant_zero():
mem = MemoryMock([0x09, 0x00, 0x00])
cpu = CPU65816(mem)
cpu.P = 0b00000000 # 16 Bit mode
cpu.e = 0
cpu.A = 0x0000
cpu.fetch_decode_execute()
assert cpu.cycles == 3
assert cpu.A == 0x0000
assert cpu.P == 0b00000010 # zero flag
assert cpu.PC == 3 + mem.header.reset_int_addr
def test_INX_no_overflow_8BIT():
mem = MemoryMock([0xE8])
cpu = CPU65816(mem)
cpu.P = 0b00010000 # 8 Bit mode
cpu.e = 0
cpu.X = 0x7F # 127 (Max Int)
cpu.fetch_decode_execute()
assert cpu.cycles == 2
assert cpu.X == 0x80 # -128 (MIN INT)
assert cpu.P == 0b10010000 # negative flag, no overflow flag
assert cpu.PC == 1 + mem.header.reset_int_addr
def test_INY():
mem = MemoryMock([0xC8])
cpu = CPU65816(mem)
cpu.P = 0b00000000 # 16 Bit mode
cpu.e = 0
cpu.Y = 0x0000
cpu.fetch_decode_execute()
assert cpu.cycles == 2
assert cpu.Y == 0x0001
assert cpu.P == 0b00000000 # no flag
assert cpu.PC == 1 + mem.header.reset_int_addr
def test_INY_no_overflow():
mem = MemoryMock([0xC8])
cpu = CPU65816(mem)
cpu.P = 0b00000000 # 16 Bit mode
cpu.e = 0
cpu.Y = 0x7FFF # 32.767 (Max Int)
cpu.fetch_decode_execute()
assert cpu.cycles == 2
assert cpu.Y == 0x8000 # -32.768 (MIN INT)
assert cpu.P == 0b10000000 # negative flag, no overflow flag
assert cpu.PC == 1 + mem.header.reset_int_addr
def test_tcs_16_zero():
mem = MemoryMock([0x1B])
cpu = CPU65816(mem)
cpu.P = 0b00000000 # 16 Bit mode
cpu.e = 0
cpu.A = 0x0000
cpu.fetch_decode_execute()
assert cpu.cycles == 2
assert cpu.SP == 0x0000
assert cpu.P == 0b0000010 # zero flag
assert cpu.PC == 1 + mem.header.reset_int_addr
def test_PHP():
mem = MemoryMock([0x08])
cpu = CPU65816(mem)
cpu.P = 0b10101010 # P
cpu.SP = 0x01FF
cpu.fetch_decode_execute()
assert cpu.P == 0b10101010
assert mem.read(0x0001FF) == 0b10101010
assert cpu.SP == 0x01FE
assert cpu.cycles == 3
assert cpu.PC == 1 + mem.header.reset_int_addr
def test_ORA_8bit_affect_16bit_zero():
mem = MemoryMock([0x09, 0x00])
cpu = CPU65816(mem)
cpu.P = 0b00100000 # 8 Bit mode
cpu.e = 0
cpu.A = 0xFF00
cpu.fetch_decode_execute()
assert cpu.cycles == 2
assert cpu.A == 0xFF00
assert cpu.P == 0b00100010 # zero flag
assert cpu.PC == 2 + mem.header.reset_int_addr
def test_LDY_const16Bit():
mem = MemoryMock([0xA0, 0x34, 0x12])
cpu = CPU65816(mem)
cpu.P = 0b00000000 # 16 Bit mode
cpu.e = 0
assert cpu.Y == 0
cpu.fetch_decode_execute()
assert cpu.cycles == 3
assert cpu.Y == 0x1234
assert cpu.P == 0b00000000
assert cpu.PC == 3 + mem.header.reset_int_addr
def test_EOR_8Bit_affect16bit_negative():
mem = MemoryMock([0x49, 0x80])
cpu = CPU65816(mem)
cpu.P = 0b00100000 # 8 Bit mode
cpu.e = 0
cpu.A = 0xFF7F
cpu.fetch_decode_execute()
assert cpu.cycles == 2
assert cpu.A == 0xFFFF
assert cpu.P == 0b10100000 # negative flag
assert cpu.PC == 2 + mem.header.reset_int_addr
def test_DEY_Zero_8BIT():
mem = MemoryMock([0x88])
cpu = CPU65816(mem)
cpu.P = 0b00010000 # 8 Bit mode
cpu.e = 0
cpu.Y = 0x01
cpu.fetch_decode_execute()
assert cpu.cycles == 2
assert cpu.Y == 0x00
assert cpu.P == 0b00010010 # zero flag
assert cpu.PC == 1 + mem.header.reset_int_addr
def test_DEY_NEG():
mem = MemoryMock([0x88])
cpu = CPU65816(mem)
cpu.P = 0b00000000 # 16 Bit mode
cpu.e = 0
cpu.Y = 0x0000
cpu.fetch_decode_execute()
assert cpu.cycles == 2
assert cpu.Y == 0xFFFF
assert cpu.P == 0b10000000 # negative flag
assert cpu.PC == 1 + mem.header.reset_int_addr
def test_DEC_NEG_8BIT():
mem = MemoryMock([0x3A])
cpu = CPU65816(mem)
cpu.P = 0b00100000 # 8 Bit mode
cpu.e = 0
cpu.A = 0x00
cpu.fetch_decode_execute()
assert cpu.cycles == 2
assert cpu.A == 0xFF
assert cpu.P == 0b10100000 # negative flag
assert cpu.PC == 1 + mem.header.reset_int_addr
def test_PEA():
mem = MemoryMock([0xF4, 0x34, 0x12])
cpu = CPU65816(mem)
cpu.SP = 0x01FF
cpu.P = 0b00000000 # M and X Flag have no effect on PEA
cpu.fetch_decode_execute() # PEA #$1234
assert mem.read(0x0001FF) == 0x12 # high
assert mem.read(0x0001FE) == 0x34 # low
assert cpu.SP == 0x01FD
assert cpu.cycles == 5
assert cpu.PC == 3 + mem.header.reset_int_addr
def test_DEY_underflow_8BIT():
mem = MemoryMock([0x88])
cpu = CPU65816(mem)
cpu.P = 0b00010000 # 8 Bit mode
cpu.e = 0
cpu.Y = 0x80 # -128 (MIN INT)
cpu.fetch_decode_execute()
assert cpu.cycles == 2
assert cpu.Y == 0x7F # 127 (Max Int)
assert cpu.P == 0b00010000 # no negative flag
assert cpu.PC == 1 + mem.header.reset_int_addr
def test_JMP_long():
mem = MemoryMock([0x5C, 0x56, 0x34, 0x12])
cpu = CPU65816(mem)
cpu.P = 0b00000000
cpu.PC += 0
cpu.PBR = 0
cpu.fetch_decode_execute()
assert cpu.P == 0b00000000
assert cpu.cycles == 4
assert cpu.PC == 0x3456
assert cpu.PBR == 0x12
def test_BIT_imm_8bit():
mem = MemoryMock([0x89, 0x00])
cpu = CPU65816(mem)
cpu.P = 0b11100000 # 8 Bit mode
cpu.e = 0
cpu.A = 0xFF
cpu.fetch_decode_execute()
assert cpu.cycles == 2
assert cpu.A == 0xFF
assert cpu.P == 0b11100010
assert cpu.PC == 2 + mem.header.reset_int_addr
