mirror of
https://github.com/jtauber/applepy.git
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c9c609be1d
This is a first step toward separating the CPU core and UI. The UI program
starts the CPU core as a subprocess and communicates through its standard input
and output. The protocol is deliberately simple at this point. Each bus request
from the core is exactly eight bytes:
+-------------------------+
| cpu cycle counter high |
+-------------------------+
| cpu cycle counter |
+-------------------------+
| cpu cycle counter |
+-------------------------+
| cpu cycle counter low |
+-------------------------+
| 0x00=read / 0x01=write |
+-------------------------+
| address high |
+-------------------------+
| address low |
+-------------------------+
| value (unused for read) |
+-------------------------+
A single-byte response from the UI is required for a read request, and a
response must not be sent for a write request.
The above protocol is expected to change. For example:
- the UI should tell the CPU core which address ranges are of interest
- needs ability to send memory images to the core (both ROM and RAM)
The stream communications is currently buggy because it expects that all eight
bytes will be read when requested (that is, partial reads are not handled). In
practice, this seems to work okay for the moment.
To improve portability, it may be better to communicate over TCP sockets
instead of stdin/stdout.
1002 lines
36 KiB
Python
1002 lines
36 KiB
Python
import unittest
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from cpu6502 import Memory, CPU
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class TestMemory(unittest.TestCase):
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def setUp(self):
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self.memory = Memory(use_stdio=False)
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def test_load(self):
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self.memory.load(0x1000, [0x01, 0x02, 0x03])
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self.assertEqual(self.memory.read_byte(None, 0x1000), 0x01)
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self.assertEqual(self.memory.read_byte(None, 0x1001), 0x02)
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self.assertEqual(self.memory.read_byte(None, 0x1002), 0x03)
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def test_write(self):
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self.memory.write_byte(None, 0x1000, 0x11)
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self.memory.write_byte(None, 0x1001, 0x12)
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self.memory.write_byte(None, 0x1002, 0x13)
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self.assertEqual(self.memory.read_byte(None, 0x1000), 0x11)
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self.assertEqual(self.memory.read_byte(None, 0x1001), 0x12)
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self.assertEqual(self.memory.read_byte(None, 0x1002), 0x13)
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class TestLoadStoreOperations(unittest.TestCase):
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def setUp(self):
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self.memory = Memory(use_stdio=False)
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self.cpu = CPU(self.memory)
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self.memory.load(0x1000, [0x00, 0x01, 0x7F, 0x80, 0xFF])
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def test_LDA(self):
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self.cpu.LDA(0x1000)
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self.assertEqual(self.cpu.accumulator, 0x00)
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self.assertEqual(self.cpu.sign_flag, 0)
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self.assertEqual(self.cpu.zero_flag, 1)
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self.cpu.LDA(0x1001)
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self.assertEqual(self.cpu.accumulator, 0x01)
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self.assertEqual(self.cpu.sign_flag, 0)
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self.assertEqual(self.cpu.zero_flag, 0)
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self.cpu.LDA(0x1002)
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self.assertEqual(self.cpu.accumulator, 0x7F)
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self.assertEqual(self.cpu.sign_flag, 0)
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self.assertEqual(self.cpu.zero_flag, 0)
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self.cpu.LDA(0x1003)
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self.assertEqual(self.cpu.accumulator, 0x80)
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self.assertEqual(self.cpu.sign_flag, 1)
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self.assertEqual(self.cpu.zero_flag, 0)
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self.cpu.LDA(0x1004)
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self.assertEqual(self.cpu.accumulator, 0xFF)
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self.assertEqual(self.cpu.sign_flag, 1)
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self.assertEqual(self.cpu.zero_flag, 0)
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def test_LDX(self):
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self.cpu.LDX(0x1000)
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self.assertEqual(self.cpu.x_index, 0x00)
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self.assertEqual(self.cpu.sign_flag, 0)
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self.assertEqual(self.cpu.zero_flag, 1)
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self.cpu.LDX(0x1001)
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self.assertEqual(self.cpu.x_index, 0x01)
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self.assertEqual(self.cpu.sign_flag, 0)
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self.assertEqual(self.cpu.zero_flag, 0)
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self.cpu.LDX(0x1002)
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self.assertEqual(self.cpu.x_index, 0x7F)
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self.assertEqual(self.cpu.sign_flag, 0)
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self.assertEqual(self.cpu.zero_flag, 0)
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self.cpu.LDX(0x1003)
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self.assertEqual(self.cpu.x_index, 0x80)
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self.assertEqual(self.cpu.sign_flag, 1)
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self.assertEqual(self.cpu.zero_flag, 0)
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self.cpu.LDX(0x1004)
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self.assertEqual(self.cpu.x_index, 0xFF)
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self.assertEqual(self.cpu.sign_flag, 1)
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self.assertEqual(self.cpu.zero_flag, 0)
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def test_LDY(self):
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self.cpu.LDY(0x1000)
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self.assertEqual(self.cpu.y_index, 0x00)
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self.assertEqual(self.cpu.sign_flag, 0)
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self.assertEqual(self.cpu.zero_flag, 1)
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self.cpu.LDY(0x1001)
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self.assertEqual(self.cpu.y_index, 0x01)
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self.assertEqual(self.cpu.sign_flag, 0)
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self.assertEqual(self.cpu.zero_flag, 0)
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self.cpu.LDY(0x1002)
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self.assertEqual(self.cpu.y_index, 0x7F)
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self.assertEqual(self.cpu.sign_flag, 0)
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self.assertEqual(self.cpu.zero_flag, 0)
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self.cpu.LDY(0x1003)
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self.assertEqual(self.cpu.y_index, 0x80)
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self.assertEqual(self.cpu.sign_flag, 1)
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self.assertEqual(self.cpu.zero_flag, 0)
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self.cpu.LDY(0x1004)
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self.assertEqual(self.cpu.y_index, 0xFF)
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self.assertEqual(self.cpu.sign_flag, 1)
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self.assertEqual(self.cpu.zero_flag, 0)
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def test_STA(self):
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self.cpu.accumulator = 0x37
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self.cpu.STA(0x2000)
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self.assertEqual(self.memory.read_byte(None, 0x2000), 0x37)
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def test_STX(self):
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self.cpu.x_index = 0x38
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self.cpu.STX(0x2000)
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self.assertEqual(self.memory.read_byte(None, 0x2000), 0x38)
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def test_STY(self):
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self.cpu.y_index = 0x39
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self.cpu.STY(0x2000)
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self.assertEqual(self.memory.read_byte(None, 0x2000), 0x39)
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class TestRegisterTransferOperations(unittest.TestCase):
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def setUp(self):
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self.memory = Memory(use_stdio=False)
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self.cpu = CPU(self.memory)
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def test_TAX(self):
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self.cpu.accumulator = 0x00
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self.cpu.TAX()
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self.assertEqual(self.cpu.x_index, 0x00)
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self.assertEqual(self.cpu.sign_flag, 0)
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self.assertEqual(self.cpu.zero_flag, 1)
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self.cpu.accumulator = 0x01
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self.cpu.TAX()
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self.assertEqual(self.cpu.x_index, 0x01)
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self.assertEqual(self.cpu.sign_flag, 0)
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self.assertEqual(self.cpu.zero_flag, 0)
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self.cpu.accumulator = 0xFF
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self.cpu.TAX()
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self.assertEqual(self.cpu.x_index, 0xFF)
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self.assertEqual(self.cpu.sign_flag, 1)
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self.assertEqual(self.cpu.zero_flag, 0)
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def test_TAY(self):
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self.cpu.accumulator = 0x00
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self.cpu.TAY()
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self.assertEqual(self.cpu.y_index, 0x00)
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self.assertEqual(self.cpu.sign_flag, 0)
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self.assertEqual(self.cpu.zero_flag, 1)
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self.cpu.accumulator = 0x01
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self.cpu.TAY()
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self.assertEqual(self.cpu.y_index, 0x01)
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self.assertEqual(self.cpu.sign_flag, 0)
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self.assertEqual(self.cpu.zero_flag, 0)
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self.cpu.accumulator = 0xFF
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self.cpu.TAY()
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self.assertEqual(self.cpu.y_index, 0xFF)
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self.assertEqual(self.cpu.sign_flag, 1)
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self.assertEqual(self.cpu.zero_flag, 0)
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def test_TXA(self):
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self.cpu.x_index = 0x00
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self.cpu.TXA()
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self.assertEqual(self.cpu.accumulator, 0x00)
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self.assertEqual(self.cpu.sign_flag, 0)
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self.assertEqual(self.cpu.zero_flag, 1)
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self.cpu.x_index = 0x01
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self.cpu.TXA()
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self.assertEqual(self.cpu.accumulator, 0x01)
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self.assertEqual(self.cpu.sign_flag, 0)
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self.assertEqual(self.cpu.zero_flag, 0)
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self.cpu.x_index = 0xFF
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self.cpu.TXA()
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self.assertEqual(self.cpu.accumulator, 0xFF)
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self.assertEqual(self.cpu.sign_flag, 1)
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self.assertEqual(self.cpu.zero_flag, 0)
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def test_TYA(self):
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self.cpu.y_index = 0x00
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self.cpu.TYA()
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self.assertEqual(self.cpu.accumulator, 0x00)
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self.assertEqual(self.cpu.sign_flag, 0)
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self.assertEqual(self.cpu.zero_flag, 1)
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self.cpu.y_index = 0x01
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self.cpu.TYA()
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self.assertEqual(self.cpu.accumulator, 0x01)
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self.assertEqual(self.cpu.sign_flag, 0)
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self.assertEqual(self.cpu.zero_flag, 0)
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self.cpu.y_index = 0xFF
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self.cpu.TYA()
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self.assertEqual(self.cpu.accumulator, 0xFF)
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self.assertEqual(self.cpu.sign_flag, 1)
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self.assertEqual(self.cpu.zero_flag, 0)
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class TestStackOperations(unittest.TestCase):
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def setUp(self):
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self.memory = Memory(use_stdio=False)
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self.cpu = CPU(self.memory)
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def test_TSX(self):
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s = self.cpu.stack_pointer
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self.cpu.TSX()
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self.assertEqual(self.cpu.x_index, s)
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# @@@ check NZ?
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def test_TXS(self):
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x = self.cpu.x_index
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self.cpu.TXS()
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self.assertEqual(self.cpu.stack_pointer, x)
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def test_PHA_and_PLA(self):
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self.cpu.accumulator = 0x00
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self.cpu.PHA()
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self.cpu.accumulator = 0x01
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self.cpu.PHA()
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self.cpu.accumulator = 0xFF
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self.cpu.PHA()
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self.assertEqual(self.cpu.accumulator, 0xFF)
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self.assertEqual(self.cpu.zero_flag, 0)
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self.assertEqual(self.cpu.sign_flag, 0)
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self.cpu.PLA()
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self.assertEqual(self.cpu.accumulator, 0xFF)
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self.assertEqual(self.cpu.zero_flag, 0)
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self.assertEqual(self.cpu.sign_flag, 1)
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self.cpu.PLA()
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self.assertEqual(self.cpu.accumulator, 0x01)
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self.assertEqual(self.cpu.zero_flag, 0)
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self.assertEqual(self.cpu.sign_flag, 0)
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self.cpu.PLA()
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self.assertEqual(self.cpu.accumulator, 0x00)
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self.assertEqual(self.cpu.zero_flag, 1)
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self.assertEqual(self.cpu.sign_flag, 0)
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def test_PHP_and_PLP(self):
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p = self.cpu.status_as_byte()
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self.cpu.PHP()
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self.cpu.status_from_byte(0xFF)
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self.cpu.PLP()
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self.assertEqual(self.cpu.status_as_byte(), p)
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class TestLogicalOperations(unittest.TestCase):
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def setUp(self):
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self.memory = Memory(use_stdio=False)
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self.cpu = CPU(self.memory)
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def test_AND(self):
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self.memory.write_byte(None, 0x1000, 0x37)
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self.cpu.accumulator = 0x34
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self.cpu.AND(0x1000)
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self.assertEqual(self.cpu.accumulator, 0x34)
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self.assertEqual(self.cpu.zero_flag, 0)
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self.assertEqual(self.cpu.sign_flag, 0)
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self.cpu.accumulator = 0x40
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self.cpu.AND(0x1000)
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self.assertEqual(self.cpu.accumulator, 0x00)
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self.assertEqual(self.cpu.zero_flag, 1)
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self.assertEqual(self.cpu.sign_flag, 0)
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def test_EOR(self):
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self.memory.write_byte(None, 0x1000, 0x37)
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self.cpu.accumulator = 0x34
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self.cpu.EOR(0x1000)
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self.assertEqual(self.cpu.accumulator, 0x03)
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self.assertEqual(self.cpu.zero_flag, 0)
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self.assertEqual(self.cpu.sign_flag, 0)
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self.cpu.accumulator = 0x90
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self.cpu.EOR(0x1000)
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self.assertEqual(self.cpu.accumulator, 0xA7)
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self.assertEqual(self.cpu.zero_flag, 0)
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self.assertEqual(self.cpu.sign_flag, 1)
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self.cpu.accumulator = 0x37
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self.cpu.EOR(0x1000)
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self.assertEqual(self.cpu.accumulator, 0x00)
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self.assertEqual(self.cpu.zero_flag, 1)
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self.assertEqual(self.cpu.sign_flag, 0)
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def test_ORA(self):
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self.memory.write_byte(None, 0x1000, 0x37)
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self.cpu.accumulator = 0x34
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self.cpu.ORA(0x1000)
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self.assertEqual(self.cpu.accumulator, 0x37)
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self.assertEqual(self.cpu.zero_flag, 0)
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self.assertEqual(self.cpu.sign_flag, 0)
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self.cpu.accumulator = 0x90
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self.cpu.ORA(0x1000)
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self.assertEqual(self.cpu.accumulator, 0xB7)
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self.assertEqual(self.cpu.zero_flag, 0)
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self.assertEqual(self.cpu.sign_flag, 1)
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self.cpu.accumulator = 0x00
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self.cpu.ORA(0x1001)
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self.assertEqual(self.cpu.accumulator, 0x00)
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self.assertEqual(self.cpu.zero_flag, 1)
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self.assertEqual(self.cpu.sign_flag, 0)
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def test_BIT(self):
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self.memory.write_byte(None, 0x1000, 0x00)
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self.cpu.accumulator = 0x00
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self.cpu.BIT(0x1000)
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self.assertEqual(self.cpu.overflow_flag, 0)
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self.assertEqual(self.cpu.sign_flag, 0)
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self.assertEqual(self.cpu.zero_flag, 1)
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self.memory.write_byte(None, 0x1000, 0x40)
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self.cpu.accumulator = 0x00
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self.cpu.BIT(0x1000)
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self.assertEqual(self.cpu.overflow_flag, 1)
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self.assertEqual(self.cpu.sign_flag, 0)
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self.assertEqual(self.cpu.zero_flag, 1)
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self.memory.write_byte(None, 0x1000, 0x80)
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self.cpu.accumulator = 0x00
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self.cpu.BIT(0x1000)
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self.assertEqual(self.cpu.overflow_flag, 0)
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self.assertEqual(self.cpu.sign_flag, 1)
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self.assertEqual(self.cpu.zero_flag, 1)
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self.memory.write_byte(None, 0x1000, 0xC0)
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self.cpu.accumulator = 0x00
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self.cpu.BIT(0x1000)
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self.assertEqual(self.cpu.overflow_flag, 1)
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self.assertEqual(self.cpu.sign_flag, 1)
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self.assertEqual(self.cpu.zero_flag, 1)
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self.memory.write_byte(None, 0x1000, 0xC0)
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self.cpu.accumulator = 0xC0
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self.cpu.BIT(0x1000)
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self.assertEqual(self.cpu.overflow_flag, 1)
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self.assertEqual(self.cpu.sign_flag, 1)
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self.assertEqual(self.cpu.zero_flag, 0)
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class TestArithmeticOperations(unittest.TestCase):
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def setUp(self):
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self.memory = Memory(use_stdio=False)
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self.cpu = CPU(self.memory)
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def test_ADC_without_BCD(self):
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## test cases from http://www.6502.org/tutorials/vflag.html
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# 1 + 1 = 2 (C = 0; V = 0)
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self.cpu.carry_flag = 0
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self.cpu.accumulator = 0x01
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self.memory.write_byte(None, 0x1000, 0x01)
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self.cpu.ADC(0x1000)
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self.assertEqual(self.cpu.accumulator, 0x02)
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self.assertEqual(self.cpu.carry_flag, 0)
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self.assertEqual(self.cpu.overflow_flag, 0)
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# 1 + -1 = 0 (C = 1; V = 0)
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self.cpu.carry_flag = 0
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self.cpu.accumulator = 0x01
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self.memory.write_byte(None, 0x1000, 0xFF)
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self.cpu.ADC(0x1000)
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self.assertEqual(self.cpu.accumulator, 0x00)
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self.assertEqual(self.cpu.carry_flag, 1)
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self.assertEqual(self.cpu.overflow_flag, 0)
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# 127 + 1 = 128 (C = 0; V = 1)
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self.cpu.carry_flag = 0
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self.cpu.accumulator = 0x7F
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self.memory.write_byte(None, 0x1000, 0x01)
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self.cpu.ADC(0x1000)
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self.assertEqual(self.cpu.accumulator, 0x80) # @@@
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self.assertEqual(self.cpu.carry_flag, 0)
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self.assertEqual(self.cpu.overflow_flag, 1)
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# -128 + -1 = -129 (C = 1; V = 1)
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self.cpu.carry_flag = 0
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self.cpu.accumulator = 0x80
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self.memory.write_byte(None, 0x1000, 0xFF)
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self.cpu.ADC(0x1000)
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self.assertEqual(self.cpu.accumulator, 0x7F) # @@@
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self.assertEqual(self.cpu.carry_flag, 1)
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self.assertEqual(self.cpu.overflow_flag, 1)
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# 63 + 64 + 1 = 128 (C = 0; V = 1)
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self.cpu.carry_flag = 1
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self.cpu.accumulator = 0x3F
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self.memory.write_byte(None, 0x1000, 0x40)
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self.cpu.ADC(0x1000)
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self.assertEqual(self.cpu.accumulator, 0x80)
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self.assertEqual(self.cpu.carry_flag, 0)
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self.assertEqual(self.cpu.overflow_flag, 1)
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def test_SBC_without_BCD(self):
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self.cpu.accumulator = 0x02
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self.memory.write_byte(None, 0x1000, 0x01)
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self.cpu.SBC(0x1000)
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self.assertEqual(self.cpu.accumulator, 0x00)
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self.assertEqual(self.cpu.carry_flag, 1)
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self.assertEqual(self.cpu.overflow_flag, 0)
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self.cpu.accumulator = 0x01
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self.memory.write_byte(None, 0x1000, 0x02)
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self.cpu.SBC(0x1000)
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self.assertEqual(self.cpu.accumulator, 0xFF)
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self.assertEqual(self.cpu.carry_flag, 0)
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self.assertEqual(self.cpu.overflow_flag, 0) # @@@
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## test cases from http://www.6502.org/tutorials/vflag.html
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# 0 - 1 = -1 (V = 0)
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self.cpu.carry_flag = 1
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self.cpu.accumulator = 0x00
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self.memory.write_byte(None, 0x1000, 0x01)
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self.cpu.SBC(0x1000)
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self.assertEqual(self.cpu.accumulator, 0xFF)
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self.assertEqual(self.cpu.carry_flag, 0)
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self.assertEqual(self.cpu.overflow_flag, 0) # @@@
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# -128 - 1 = -129 (V = 1)
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self.cpu.carry_flag = 1
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self.cpu.accumulator = 0x80
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self.memory.write_byte(None, 0x1000, 0x01)
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self.cpu.SBC(0x1000)
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self.assertEqual(self.cpu.accumulator, 0x7F)
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self.assertEqual(self.cpu.carry_flag, 1)
|
|
self.assertEqual(self.cpu.overflow_flag, 1)
|
|
|
|
# 127 - -1 = 128 (V = 1)
|
|
self.cpu.carry_flag = 1
|
|
self.cpu.accumulator = 0x7F
|
|
self.memory.write_byte(None, 0x1000, 0xFF)
|
|
self.cpu.SBC(0x1000)
|
|
self.assertEqual(self.cpu.accumulator, 0x80)
|
|
self.assertEqual(self.cpu.carry_flag, 0)
|
|
self.assertEqual(self.cpu.overflow_flag, 1)
|
|
|
|
# -64 -64 -1 = -129 (V = 1)
|
|
self.cpu.carry_flag = 0
|
|
self.cpu.accumulator = 0xC0
|
|
self.memory.write_byte(None, 0x1000, 0x40)
|
|
self.cpu.SBC(0x1000)
|
|
self.assertEqual(self.cpu.accumulator, 0x7F)
|
|
self.assertEqual(self.cpu.carry_flag, 1)
|
|
self.assertEqual(self.cpu.overflow_flag, 1) # @@@
|
|
|
|
## @@@ BCD versions still to do
|
|
|
|
def test_CMP(self):
|
|
self.cpu.accumulator = 0x0A
|
|
self.memory.write_byte(None, 0x1000, 0x09)
|
|
self.cpu.CMP(0x1000)
|
|
self.assertEqual(self.cpu.sign_flag, 0)
|
|
self.assertEqual(self.cpu.zero_flag, 0)
|
|
self.assertEqual(self.cpu.carry_flag, 1)
|
|
|
|
self.cpu.accumulator = 0x0A
|
|
self.memory.write_byte(None, 0x1000, 0x0B)
|
|
self.cpu.CMP(0x1000)
|
|
self.assertEqual(self.cpu.sign_flag, 1)
|
|
self.assertEqual(self.cpu.zero_flag, 0)
|
|
self.assertEqual(self.cpu.carry_flag, 0)
|
|
|
|
self.cpu.accumulator = 0x0A
|
|
self.memory.write_byte(None, 0x1000, 0x0A)
|
|
self.cpu.CMP(0x1000)
|
|
self.assertEqual(self.cpu.sign_flag, 0)
|
|
self.assertEqual(self.cpu.zero_flag, 1)
|
|
self.assertEqual(self.cpu.carry_flag, 1)
|
|
|
|
self.cpu.accumulator = 0xA0
|
|
self.memory.write_byte(None, 0x1000, 0x0A)
|
|
self.cpu.CMP(0x1000)
|
|
self.assertEqual(self.cpu.sign_flag, 1)
|
|
self.assertEqual(self.cpu.zero_flag, 0)
|
|
self.assertEqual(self.cpu.carry_flag, 1)
|
|
|
|
self.cpu.accumulator = 0x0A
|
|
self.memory.write_byte(None, 0x1000, 0xA0)
|
|
self.cpu.CMP(0x1000)
|
|
self.assertEqual(self.cpu.sign_flag, 0) # @@@
|
|
self.assertEqual(self.cpu.zero_flag, 0)
|
|
self.assertEqual(self.cpu.carry_flag, 0)
|
|
|
|
def test_CPX(self):
|
|
self.cpu.x_index = 0x0A
|
|
self.memory.write_byte(None, 0x1000, 0x09)
|
|
self.cpu.CPX(0x1000)
|
|
self.assertEqual(self.cpu.sign_flag, 0)
|
|
self.assertEqual(self.cpu.zero_flag, 0)
|
|
self.assertEqual(self.cpu.carry_flag, 1)
|
|
|
|
self.cpu.x_index = 0x0A
|
|
self.memory.write_byte(None, 0x1000, 0x0B)
|
|
self.cpu.CPX(0x1000)
|
|
self.assertEqual(self.cpu.sign_flag, 1)
|
|
self.assertEqual(self.cpu.zero_flag, 0)
|
|
self.assertEqual(self.cpu.carry_flag, 0)
|
|
|
|
self.cpu.x_index = 0x0A
|
|
self.memory.write_byte(None, 0x1000, 0x0A)
|
|
self.cpu.CPX(0x1000)
|
|
self.assertEqual(self.cpu.sign_flag, 0)
|
|
self.assertEqual(self.cpu.zero_flag, 1)
|
|
self.assertEqual(self.cpu.carry_flag, 1)
|
|
|
|
self.cpu.x_index = 0xA0
|
|
self.memory.write_byte(None, 0x1000, 0x0A)
|
|
self.cpu.CPX(0x1000)
|
|
self.assertEqual(self.cpu.sign_flag, 1)
|
|
self.assertEqual(self.cpu.zero_flag, 0)
|
|
self.assertEqual(self.cpu.carry_flag, 1)
|
|
|
|
self.cpu.x_index = 0x0A
|
|
self.memory.write_byte(None, 0x1000, 0xA0)
|
|
self.cpu.CPX(0x1000)
|
|
self.assertEqual(self.cpu.sign_flag, 0) # @@@
|
|
self.assertEqual(self.cpu.zero_flag, 0)
|
|
self.assertEqual(self.cpu.carry_flag, 0)
|
|
|
|
def test_CPY(self):
|
|
self.cpu.y_index = 0x0A
|
|
self.memory.write_byte(None, 0x1000, 0x09)
|
|
self.cpu.CPY(0x1000)
|
|
self.assertEqual(self.cpu.sign_flag, 0)
|
|
self.assertEqual(self.cpu.zero_flag, 0)
|
|
self.assertEqual(self.cpu.carry_flag, 1)
|
|
|
|
self.cpu.y_index = 0x0A
|
|
self.memory.write_byte(None, 0x1000, 0x0B)
|
|
self.cpu.CPY(0x1000)
|
|
self.assertEqual(self.cpu.sign_flag, 1)
|
|
self.assertEqual(self.cpu.zero_flag, 0)
|
|
self.assertEqual(self.cpu.carry_flag, 0)
|
|
|
|
self.cpu.y_index = 0x0A
|
|
self.memory.write_byte(None, 0x1000, 0x0A)
|
|
self.cpu.CPY(0x1000)
|
|
self.assertEqual(self.cpu.sign_flag, 0)
|
|
self.assertEqual(self.cpu.zero_flag, 1)
|
|
self.assertEqual(self.cpu.carry_flag, 1)
|
|
|
|
self.cpu.y_index = 0xA0
|
|
self.memory.write_byte(None, 0x1000, 0x0A)
|
|
self.cpu.CPY(0x1000)
|
|
self.assertEqual(self.cpu.sign_flag, 1)
|
|
self.assertEqual(self.cpu.zero_flag, 0)
|
|
self.assertEqual(self.cpu.carry_flag, 1)
|
|
|
|
self.cpu.y_index = 0x0A
|
|
self.memory.write_byte(None, 0x1000, 0xA0)
|
|
self.cpu.CPY(0x1000)
|
|
self.assertEqual(self.cpu.sign_flag, 0) # @@@
|
|
self.assertEqual(self.cpu.zero_flag, 0)
|
|
self.assertEqual(self.cpu.carry_flag, 0)
|
|
|
|
|
|
class TestIncrementDecrementOperations(unittest.TestCase):
|
|
|
|
def setUp(self):
|
|
self.memory = Memory(use_stdio=False)
|
|
self.cpu = CPU(self.memory)
|
|
|
|
def test_INC(self):
|
|
self.memory.write_byte(None, 0x1000, 0x00)
|
|
self.cpu.INC(0x1000)
|
|
self.assertEqual(self.memory.read_byte(None, 0x1000), 0x01)
|
|
self.assertEqual(self.cpu.sign_flag, 0)
|
|
self.assertEqual(self.cpu.zero_flag, 0)
|
|
self.memory.write_byte(None, 0x1000, 0x7F)
|
|
self.cpu.INC(0x1000)
|
|
self.assertEqual(self.memory.read_byte(None, 0x1000), 0x80)
|
|
self.assertEqual(self.cpu.sign_flag, 1)
|
|
self.assertEqual(self.cpu.zero_flag, 0)
|
|
self.memory.write_byte(None, 0x1000, 0xFF)
|
|
self.cpu.INC(0x1000)
|
|
self.assertEqual(self.memory.read_byte(None, 0x1000), 0x00)
|
|
self.assertEqual(self.cpu.sign_flag, 0)
|
|
self.assertEqual(self.cpu.zero_flag, 1)
|
|
|
|
def test_INX(self):
|
|
self.cpu.x_index = 0x00
|
|
self.cpu.INX()
|
|
self.assertEqual(self.cpu.x_index, 0x01)
|
|
self.assertEqual(self.cpu.sign_flag, 0)
|
|
self.assertEqual(self.cpu.zero_flag, 0)
|
|
self.cpu.x_index = 0x7F
|
|
self.cpu.INX()
|
|
self.assertEqual(self.cpu.x_index, 0x80)
|
|
self.assertEqual(self.cpu.sign_flag, 1)
|
|
self.assertEqual(self.cpu.zero_flag, 0)
|
|
self.cpu.x_index = 0xFF
|
|
self.cpu.INX()
|
|
self.assertEqual(self.cpu.x_index, 0x00)
|
|
self.assertEqual(self.cpu.sign_flag, 0)
|
|
self.assertEqual(self.cpu.zero_flag, 1)
|
|
|
|
def test_INY(self):
|
|
self.cpu.y_index = 0x00
|
|
self.cpu.INY()
|
|
self.assertEqual(self.cpu.y_index, 0x01)
|
|
self.assertEqual(self.cpu.sign_flag, 0)
|
|
self.assertEqual(self.cpu.zero_flag, 0)
|
|
self.cpu.y_index = 0x7F
|
|
self.cpu.INY()
|
|
self.assertEqual(self.cpu.y_index, 0x80)
|
|
self.assertEqual(self.cpu.sign_flag, 1)
|
|
self.assertEqual(self.cpu.zero_flag, 0)
|
|
self.cpu.y_index = 0xFF
|
|
self.cpu.INY()
|
|
self.assertEqual(self.cpu.y_index, 0x00)
|
|
self.assertEqual(self.cpu.sign_flag, 0)
|
|
self.assertEqual(self.cpu.zero_flag, 1)
|
|
|
|
def test_DEC(self):
|
|
self.memory.write_byte(None, 0x1000, 0x01)
|
|
self.cpu.DEC(0x1000)
|
|
self.assertEqual(self.memory.read_byte(None, 0x1000), 0x00)
|
|
self.assertEqual(self.cpu.sign_flag, 0)
|
|
self.assertEqual(self.cpu.zero_flag, 1)
|
|
self.memory.write_byte(None, 0x1000, 0x80)
|
|
self.cpu.DEC(0x1000)
|
|
self.assertEqual(self.memory.read_byte(None, 0x1000), 0x7F)
|
|
self.assertEqual(self.cpu.sign_flag, 0)
|
|
self.assertEqual(self.cpu.zero_flag, 0)
|
|
self.memory.write_byte(None, 0x1000, 0x00)
|
|
self.cpu.DEC(0x1000)
|
|
self.assertEqual(self.memory.read_byte(None, 0x1000), 0xFF)
|
|
self.assertEqual(self.cpu.sign_flag, 1)
|
|
self.assertEqual(self.cpu.zero_flag, 0)
|
|
|
|
def test_DEX(self):
|
|
self.cpu.x_index = 0x01
|
|
self.cpu.DEX()
|
|
self.assertEqual(self.cpu.x_index, 0x00)
|
|
self.assertEqual(self.cpu.sign_flag, 0)
|
|
self.assertEqual(self.cpu.zero_flag, 1)
|
|
self.cpu.x_index = 0x80
|
|
self.cpu.DEX()
|
|
self.assertEqual(self.cpu.x_index, 0x7F)
|
|
self.assertEqual(self.cpu.sign_flag, 0)
|
|
self.assertEqual(self.cpu.zero_flag, 0)
|
|
self.cpu.x_index = 0x00
|
|
self.cpu.DEX()
|
|
self.assertEqual(self.cpu.x_index, 0xFF)
|
|
self.assertEqual(self.cpu.sign_flag, 1)
|
|
self.assertEqual(self.cpu.zero_flag, 0)
|
|
|
|
def test_DEY(self):
|
|
self.cpu.y_index = 0x01
|
|
self.cpu.DEY()
|
|
self.assertEqual(self.cpu.y_index, 0x00)
|
|
self.assertEqual(self.cpu.sign_flag, 0)
|
|
self.assertEqual(self.cpu.zero_flag, 1)
|
|
self.cpu.y_index = 0x80
|
|
self.cpu.DEY()
|
|
self.assertEqual(self.cpu.y_index, 0x7F)
|
|
self.assertEqual(self.cpu.sign_flag, 0)
|
|
self.assertEqual(self.cpu.zero_flag, 0)
|
|
self.cpu.y_index = 0x00
|
|
self.cpu.DEY()
|
|
self.assertEqual(self.cpu.y_index, 0xFF)
|
|
self.assertEqual(self.cpu.sign_flag, 1)
|
|
self.assertEqual(self.cpu.zero_flag, 0)
|
|
|
|
|
|
class TestShiftOperations(unittest.TestCase):
|
|
|
|
def setUp(self):
|
|
self.memory = Memory(use_stdio=False)
|
|
self.cpu = CPU(self.memory)
|
|
|
|
def test_ASL(self):
|
|
self.cpu.accumulator = 0x01
|
|
self.cpu.ASL()
|
|
self.assertEqual(self.cpu.accumulator, 0x02)
|
|
self.assertEqual(self.cpu.sign_flag, 0)
|
|
self.assertEqual(self.cpu.zero_flag, 0)
|
|
self.assertEqual(self.cpu.carry_flag, 0)
|
|
self.memory.write_byte(None, 0x1000, 0x02)
|
|
self.cpu.ASL(0x1000)
|
|
self.assertEqual(self.memory.read_byte(None, 0x1000), 0x04)
|
|
self.assertEqual(self.cpu.sign_flag, 0)
|
|
self.assertEqual(self.cpu.zero_flag, 0)
|
|
self.assertEqual(self.cpu.carry_flag, 0)
|
|
self.cpu.accumulator = 0x80
|
|
self.cpu.ASL()
|
|
self.assertEqual(self.cpu.accumulator, 0x00)
|
|
self.assertEqual(self.cpu.sign_flag, 0)
|
|
self.assertEqual(self.cpu.zero_flag, 1)
|
|
self.assertEqual(self.cpu.carry_flag, 1)
|
|
|
|
def test_LSR(self):
|
|
self.cpu.accumulator = 0x01
|
|
self.cpu.LSR()
|
|
self.assertEqual(self.cpu.accumulator, 0x00)
|
|
self.assertEqual(self.cpu.sign_flag, 0)
|
|
self.assertEqual(self.cpu.zero_flag, 1)
|
|
self.assertEqual(self.cpu.carry_flag, 1)
|
|
self.memory.write_byte(None, 0x1000, 0x01)
|
|
self.cpu.LSR(0x1000)
|
|
self.assertEqual(self.memory.read_byte(None, 0x1000), 0x00)
|
|
self.assertEqual(self.cpu.sign_flag, 0)
|
|
self.assertEqual(self.cpu.zero_flag, 1)
|
|
self.assertEqual(self.cpu.carry_flag, 1)
|
|
self.cpu.accumulator = 0x80
|
|
self.cpu.LSR()
|
|
self.assertEqual(self.cpu.accumulator, 0x40)
|
|
self.assertEqual(self.cpu.sign_flag, 0)
|
|
self.assertEqual(self.cpu.zero_flag, 0)
|
|
self.assertEqual(self.cpu.carry_flag, 0)
|
|
|
|
def test_ROL(self):
|
|
self.cpu.carry_flag = 0
|
|
self.cpu.accumulator = 0x80
|
|
self.cpu.ROL()
|
|
self.assertEqual(self.cpu.accumulator, 0x00)
|
|
self.assertEqual(self.cpu.sign_flag, 0)
|
|
self.assertEqual(self.cpu.zero_flag, 1)
|
|
self.assertEqual(self.cpu.carry_flag, 1)
|
|
self.cpu.carry_flag = 1
|
|
self.cpu.accumulator = 0x80
|
|
self.cpu.ROL()
|
|
self.assertEqual(self.cpu.accumulator, 0x01)
|
|
self.assertEqual(self.cpu.sign_flag, 0)
|
|
self.assertEqual(self.cpu.zero_flag, 0) # @@@
|
|
self.assertEqual(self.cpu.carry_flag, 1)
|
|
self.cpu.carry_flag = 0
|
|
self.memory.write_byte(None, 0x1000, 0x80)
|
|
self.cpu.ROL(0x1000)
|
|
self.assertEqual(self.memory.read_byte(None, 0x1000), 0x00)
|
|
self.assertEqual(self.cpu.sign_flag, 0)
|
|
self.assertEqual(self.cpu.zero_flag, 1) # @@@
|
|
self.assertEqual(self.cpu.carry_flag, 1)
|
|
self.cpu.carry_flag = 1
|
|
self.memory.write_byte(None, 0x1000, 0x80)
|
|
self.cpu.ROL(0x1000)
|
|
self.assertEqual(self.memory.read_byte(None, 0x1000), 0x01)
|
|
self.assertEqual(self.cpu.sign_flag, 0)
|
|
self.assertEqual(self.cpu.zero_flag, 0) # @@@
|
|
self.assertEqual(self.cpu.carry_flag, 1)
|
|
|
|
def test_ROR(self):
|
|
self.cpu.carry_flag = 0
|
|
self.cpu.accumulator = 0x01
|
|
self.cpu.ROR()
|
|
self.assertEqual(self.cpu.accumulator, 0x00)
|
|
self.assertEqual(self.cpu.sign_flag, 0)
|
|
self.assertEqual(self.cpu.zero_flag, 1) # @@@
|
|
self.assertEqual(self.cpu.carry_flag, 1)
|
|
self.cpu.carry_flag = 1
|
|
self.cpu.accumulator = 0x01
|
|
self.cpu.ROR()
|
|
self.assertEqual(self.cpu.accumulator, 0x80)
|
|
self.assertEqual(self.cpu.sign_flag, 1) # @@@
|
|
self.assertEqual(self.cpu.zero_flag, 0) # @@@
|
|
self.assertEqual(self.cpu.carry_flag, 1)
|
|
self.cpu.carry_flag = 0
|
|
self.memory.write_byte(None, 0x1000, 0x01)
|
|
self.cpu.ROR(0x1000)
|
|
self.assertEqual(self.memory.read_byte(None, 0x1000), 0x00)
|
|
self.assertEqual(self.cpu.sign_flag, 0)
|
|
self.assertEqual(self.cpu.zero_flag, 1) # @@@
|
|
self.assertEqual(self.cpu.carry_flag, 1)
|
|
self.cpu.carry_flag = 1
|
|
self.memory.write_byte(None, 0x1000, 0x01)
|
|
self.cpu.ROR(0x1000)
|
|
self.assertEqual(self.memory.read_byte(None, 0x1000), 0x80)
|
|
self.assertEqual(self.cpu.sign_flag, 1) # @@@
|
|
self.assertEqual(self.cpu.zero_flag, 0) # @@@
|
|
self.assertEqual(self.cpu.carry_flag, 1)
|
|
|
|
|
|
class TestJumpCallOperations(unittest.TestCase):
|
|
|
|
def setUp(self):
|
|
self.memory = Memory(use_stdio=False)
|
|
self.cpu = CPU(self.memory)
|
|
|
|
def test_JMP(self):
|
|
self.cpu.JMP(0x1000)
|
|
self.assertEqual(self.cpu.program_counter, 0x1000)
|
|
|
|
def test_JSR(self):
|
|
self.cpu.program_counter = 0x1000
|
|
self.cpu.JSR(0x2000)
|
|
self.assertEqual(self.cpu.program_counter, 0x2000)
|
|
self.assertEqual(self.memory.read_byte(None, self.cpu.STACK_PAGE + self.cpu.stack_pointer + 1), 0xFF)
|
|
self.assertEqual(self.memory.read_byte(None, self.cpu.STACK_PAGE + self.cpu.stack_pointer + 2), 0x0F)
|
|
|
|
def test_RTS(self):
|
|
self.memory.write_byte(None, self.cpu.STACK_PAGE + 0xFF, 0x12)
|
|
self.memory.write_byte(None, self.cpu.STACK_PAGE + 0xFE, 0x33)
|
|
self.cpu.stack_pointer = 0xFD
|
|
self.cpu.RTS()
|
|
self.assertEqual(self.cpu.program_counter, 0x1234)
|
|
|
|
def test_JSR_and_RTS(self):
|
|
self.cpu.program_counter = 0x1000
|
|
self.cpu.JSR(0x2000)
|
|
self.assertEqual(self.cpu.program_counter, 0x2000)
|
|
self.cpu.RTS()
|
|
self.assertEqual(self.cpu.program_counter, 0x1000) # @@@
|
|
|
|
|
|
class TestBranchOperations(unittest.TestCase):
|
|
|
|
def setUp(self):
|
|
self.memory = Memory(use_stdio=False)
|
|
self.cpu = CPU(self.memory)
|
|
|
|
def test_BCC(self):
|
|
self.cpu.program_counter = 0x1000
|
|
self.cpu.carry_flag = 1
|
|
self.cpu.BCC(0x2000)
|
|
self.assertEqual(self.cpu.program_counter, 0x1000)
|
|
self.cpu.program_counter = 0x1000
|
|
self.cpu.carry_flag = 0
|
|
self.cpu.BCC(0x2000)
|
|
self.assertEqual(self.cpu.program_counter, 0x2000)
|
|
|
|
def test_BCS(self):
|
|
self.cpu.program_counter = 0x1000
|
|
self.cpu.carry_flag = 0
|
|
self.cpu.BCS(0x2000)
|
|
self.assertEqual(self.cpu.program_counter, 0x1000)
|
|
self.cpu.program_counter = 0x1000
|
|
self.cpu.carry_flag = 1
|
|
self.cpu.BCS(0x2000)
|
|
self.assertEqual(self.cpu.program_counter, 0x2000)
|
|
|
|
def test_BEQ(self):
|
|
self.cpu.program_counter = 0x1000
|
|
self.cpu.zero_flag = 0
|
|
self.cpu.BEQ(0x2000)
|
|
self.assertEqual(self.cpu.program_counter, 0x1000)
|
|
self.cpu.program_counter = 0x1000
|
|
self.cpu.zero_flag = 1
|
|
self.cpu.BEQ(0x2000)
|
|
self.assertEqual(self.cpu.program_counter, 0x2000)
|
|
|
|
def test_BMI(self):
|
|
self.cpu.program_counter = 0x1000
|
|
self.cpu.sign_flag = 0
|
|
self.cpu.BMI(0x2000)
|
|
self.assertEqual(self.cpu.program_counter, 0x1000)
|
|
self.cpu.program_counter = 0x1000
|
|
self.cpu.sign_flag = 1
|
|
self.cpu.BMI(0x2000)
|
|
self.assertEqual(self.cpu.program_counter, 0x2000)
|
|
|
|
def test_BNE(self):
|
|
self.cpu.program_counter = 0x1000
|
|
self.cpu.zero_flag = 1
|
|
self.cpu.BNE(0x2000)
|
|
self.assertEqual(self.cpu.program_counter, 0x1000)
|
|
self.cpu.program_counter = 0x1000
|
|
self.cpu.zero_flag = 0
|
|
self.cpu.BNE(0x2000)
|
|
self.assertEqual(self.cpu.program_counter, 0x2000)
|
|
|
|
def test_BPL(self):
|
|
self.cpu.program_counter = 0x1000
|
|
self.cpu.sign_flag = 1
|
|
self.cpu.BPL(0x2000)
|
|
self.assertEqual(self.cpu.program_counter, 0x1000)
|
|
self.cpu.program_counter = 0x1000
|
|
self.cpu.sign_flag = 0
|
|
self.cpu.BPL(0x2000)
|
|
self.assertEqual(self.cpu.program_counter, 0x2000)
|
|
|
|
def test_BVC(self):
|
|
self.cpu.program_counter = 0x1000
|
|
self.cpu.overflow_flag = 1
|
|
self.cpu.BVC(0x2000)
|
|
self.assertEqual(self.cpu.program_counter, 0x1000)
|
|
self.cpu.program_counter = 0x1000
|
|
self.cpu.overflow_flag = 0
|
|
self.cpu.BVC(0x2000)
|
|
self.assertEqual(self.cpu.program_counter, 0x2000)
|
|
|
|
def test_BVS(self):
|
|
self.cpu.program_counter = 0x1000
|
|
self.cpu.overflow_flag = 0
|
|
self.cpu.BVS(0x2000)
|
|
self.assertEqual(self.cpu.program_counter, 0x1000)
|
|
self.cpu.program_counter = 0x1000
|
|
self.cpu.overflow_flag = 1
|
|
self.cpu.BVS(0x2000)
|
|
self.assertEqual(self.cpu.program_counter, 0x2000)
|
|
|
|
|
|
class TestStatusFlagOperations(unittest.TestCase):
|
|
|
|
def setUp(self):
|
|
self.memory = Memory(use_stdio=False)
|
|
self.cpu = CPU(self.memory)
|
|
|
|
def test_CLC(self):
|
|
self.cpu.carry_flag = 1
|
|
self.cpu.CLC()
|
|
self.assertEqual(self.cpu.carry_flag, 0)
|
|
|
|
def test_CLD(self):
|
|
self.cpu.decimal_mode_flag = 1
|
|
self.cpu.CLD()
|
|
self.assertEqual(self.cpu.decimal_mode_flag, 0)
|
|
|
|
def test_CLI(self):
|
|
self.cpu.interrupt_disable_flag = 1
|
|
self.cpu.CLI()
|
|
self.assertEqual(self.cpu.interrupt_disable_flag, 0)
|
|
|
|
def test_CLV(self):
|
|
self.cpu.overflow_flag = 1
|
|
self.cpu.CLV()
|
|
self.assertEqual(self.cpu.overflow_flag, 0)
|
|
|
|
def test_SEC(self):
|
|
self.cpu.carry_flag = 0
|
|
self.cpu.SEC()
|
|
self.assertEqual(self.cpu.carry_flag, 1)
|
|
|
|
def test_SED(self):
|
|
self.cpu.decimal_mode_flag = 0
|
|
self.cpu.SED()
|
|
self.assertEqual(self.cpu.decimal_mode_flag, 1)
|
|
|
|
def test_SEI(self):
|
|
self.cpu.interrupt_disable_flag = 0
|
|
self.cpu.SEI()
|
|
self.assertEqual(self.cpu.interrupt_disable_flag, 1)
|
|
|
|
|
|
class TestSystemFunctionOperations(unittest.TestCase):
|
|
|
|
def setUp(self):
|
|
self.memory = Memory(use_stdio=False)
|
|
self.cpu = CPU(self.memory)
|
|
|
|
def test_BRK(self):
|
|
self.cpu.program_counter = 0x1000
|
|
self.memory.rom.load(0xFFFE, [0x00, 0x20])
|
|
status = self.cpu.status_as_byte()
|
|
self.cpu.BRK()
|
|
self.assertEqual(self.cpu.program_counter, 0x2000)
|
|
self.assertEqual(self.cpu.break_flag, 1)
|
|
self.assertEqual(self.memory.read_byte(None, self.cpu.STACK_PAGE + self.cpu.stack_pointer + 1), status)
|
|
self.assertEqual(self.memory.read_byte(None, self.cpu.STACK_PAGE + self.cpu.stack_pointer + 2), 0x01)
|
|
self.assertEqual(self.memory.read_byte(None, self.cpu.STACK_PAGE + self.cpu.stack_pointer + 3), 0x10)
|
|
|
|
def test_RTI(self):
|
|
self.memory.write_byte(None, self.cpu.STACK_PAGE + 0xFF, 0x12)
|
|
self.memory.write_byte(None, self.cpu.STACK_PAGE + 0xFE, 0x33)
|
|
self.memory.write_byte(None, self.cpu.STACK_PAGE + 0xFD, 0x20)
|
|
self.cpu.stack_pointer = 0xFC
|
|
self.cpu.RTI()
|
|
self.assertEqual(self.cpu.program_counter, 0x1233)
|
|
self.assertEqual(self.cpu.status_as_byte(), 0x20)
|
|
|
|
def test_NOP(self):
|
|
self.cpu.NOP()
|
|
|
|
|
|
class Test6502Bugs(unittest.TestCase):
|
|
|
|
def setUp(self):
|
|
self.memory = Memory(use_stdio=False)
|
|
self.cpu = CPU(self.memory)
|
|
|
|
def test_zero_page_x(self):
|
|
self.cpu.x_index = 0x01
|
|
self.memory.load(0x1000, [0x00, 0x7F, 0xFF])
|
|
self.cpu.program_counter = 0x1000
|
|
self.assertEqual(self.cpu.zero_page_x_mode(), 0x01)
|
|
self.assertEqual(self.cpu.zero_page_x_mode(), 0x80)
|
|
self.assertEqual(self.cpu.zero_page_x_mode(), 0x00)
|
|
|
|
def test_indirect(self):
|
|
self.memory.load(0x20, [0x00, 0x20])
|
|
self.memory.load(0x00, [0x12])
|
|
self.memory.load(0xFF, [0x34])
|
|
self.memory.load(0x100, [0x56])
|
|
self.memory.load(0x1000, [0x20, 0x20, 0xFF, 0xFF, 0x00, 0x45, 0x23])
|
|
self.memory.load(0x2000, [0x05])
|
|
self.memory.load(0x1234, [0x05])
|
|
self.memory.load(0x2345, [0x00, 0xF0])
|
|
|
|
self.cpu.program_counter = 0x1000
|
|
|
|
self.cpu.x_index = 0x00
|
|
self.cpu.LDA(self.cpu.indirect_x_mode())
|
|
self.assertEqual(self.cpu.accumulator, 0x05)
|
|
|
|
self.cpu.y_index = 0x00
|
|
self.cpu.LDA(self.cpu.indirect_y_mode())
|
|
self.assertEqual(self.cpu.accumulator, 0x05)
|
|
|
|
self.cpu.y_index = 0x00
|
|
self.cpu.LDA(self.cpu.indirect_y_mode())
|
|
self.assertEqual(self.cpu.accumulator, 0x05)
|
|
|
|
self.cpu.x_index = 0x00
|
|
self.cpu.LDA(self.cpu.indirect_x_mode())
|
|
self.assertEqual(self.cpu.accumulator, 0x05)
|
|
|
|
self.cpu.x_index = 0xFF
|
|
self.cpu.LDA(self.cpu.indirect_x_mode())
|
|
self.assertEqual(self.cpu.accumulator, 0x05)
|
|
|
|
self.assertEqual(self.cpu.indirect_mode(), 0xF000)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
unittest.main()
|