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Eprom emulation

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Aiden
2026-05-25 23:28:14 +10:00
parent 0819701b22
commit 3f9f03388c
12 changed files with 129 additions and 6 deletions
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33
tests/test_emulator_addressing.py
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@@ -1,6 +1,6 @@
import unittest
from h8536.emulator import H8536Emulator
from h8536.emulator import H8536Emulator, MemoryMap, P7DDR, P7DR
def rom_with_reset(*, reset: int = 0x1000, size: int = 0x1100) -> bytearray:
@@ -10,6 +10,35 @@ def rom_with_reset(*, reset: int = 0x1000, size: int = 0x1100) -> bytearray:
class EmulatorAddressingTest(unittest.TestCase):
def test_p7dr_reads_external_pin_state_for_input_bits(self):
memory = MemoryMap(b"\x00" * 4, p7_input=0xFF)
memory.write8(P7DDR, 0x00)
memory.write8(P7DR, 0x00)
self.assertEqual(memory.read8(P7DR), 0xFF)
def test_p7dr_output_bits_read_latch_while_input_bits_read_pins(self):
memory = MemoryMap(b"\x00" * 4, p7_input=0x7F)
memory.write8(P7DDR, 0x80)
memory.write8(P7DR, 0x00)
self.assertEqual(memory.read8(P7DR), 0x7F)
def test_factory_eeprom_seed_populates_shadow_and_page_labels(self):
rom = bytearray([0xFF] * 0xCB00)
rom[0xC966:0xC968] = b"\x6B\x6F"
rom[0xC974:0xC976] = b"\x80\x00"
memory = MemoryMap(bytes(rom))
memory.seed_factory_eeprom_and_shadow()
self.assertEqual(memory.read16(0xF402), 0x6B6F)
self.assertEqual(memory.p9_bus.fast_read_word(0x0010), (True, 0x8000))
self.assertEqual(memory.p9_bus.fast_read_word(0x0110), (True, 0x8000))
self.assertEqual(memory.p9_bus.fast_read_word(0x0002), (True, 0x2020))
def test_txi_indexed_byte_load_uses_signed_word_displacement_and_full_index_register(self):
rom = rom_with_reset()
rom[0x1000:0x1004] = b"\xF0\xF8\x58\x80" # MOV:G.B @(-H'07A8,R0), R0
@@ -62,7 +91,7 @@ class EmulatorAddressingTest(unittest.TestCase):
rom = rom_with_reset()
rom[0x1000:0x1003] = b"\xE1\xFE\x81" # MOV:G.B @(H'-02,R1), R1
emulator = H8536Emulator(bytes(rom))
emulator = H8536Emulator(bytes(rom), p7_input=0x37)
emulator.cpu.regs[1] = 0xFE90
emulator.memory.write8(0xFE8E, 0x37)
emulator.step()