def test_read_initial_state():
# The following are not necessary, but it was very helpful in debugging
Emulator.run_to(0x2FF, max_instructions=10_000_000) # Entry of vCPU
Emulator.run_vcpu_to(0x200) # Pass through loading sequence
buffer = bytearray()
for _ in range(5):
value = Emulator.read_serial(bits=8)
buffer.append(value)
assert buffer == b"READY"
def test_MulShift8(a, b):
_prepare_for_vcpu_execution_at(execution_address)
Emulator.run_vcpu_to(
0x300) # Run the first page, so the variable is defined
_write_word(vars.sysFn, asm.symbol("SYS_MultiplyBytes_120"), signed=False)
_write_word(symbol_table["A"], a, signed=True)
_write_word(symbol_table["B"], b, signed=True)
_call_vcpu_function("MulShift8")
assert int(a * b / 256) == _read_word(vars.vAC, signed=True)
def _call_vcpu_function(variable):
return_point = Emulator.vPC & 0xFF00 | (Emulator.vPC + 2) & 0xFF
Emulator.AC = symbol_table[variable]
Emulator.next_instruction = "CALL"
Emulator.step_vcpu() # Execute CALL
Emulator.run_vcpu_to(return_point)
