RuntimeError: Wrong PC ??? when using a speed limited CPU

[Riceeter]

Hi, I am not sure this qualifies as an issue. I would generally put this in a discussion tab but there does not seem to be one for this repository. Anyway, I am trying to execute the following code on an instance of the class CPUSpeedLimit:

self.cpu.memory.load(0x100, bytearray([
    # A = atoi(*(0x1000)) + atoi(*(0x1001)):
    0xB6, 0x10, 0x00,   # LDA       (extended)      0x1000
    0x80, 0x30,         # SUBA      (immediate)     0x30 (48 in base 10)
    0xF6, 0x10, 0x01,   # LDB       (extended)      0x1001
    0xC0, 0x30,         # SUBB      (immediate)     0x30 (48 in base 10)
    0xF7, 0x10, 0x02,   # STB       (extended)      0x1002
    0xBB, 0x10, 0x02    # ADDA      (extended)      0x1002
]))

self.cpu.program_counter.set(0x100)

self.cpu.run(target_cycles_per_sec=1)

But upon running it, I get the following error:
File "MC6809/MC6809/components/mc6809_base.py", line 787, in instruction_NEG_memory raise RuntimeError("Wrong PC ???") RuntimeError: Wrong PC ???
I am not sure about what causes this error. Again, I apologize if it is the wrong place to ask but I did not really know where to put my message. Thanks in advance.

[jedie]

I open discussions: https://github.com/6809/MC6809/discussions ;)

Off the top of my head, I have no idea where the problem lies.

[Riceeter]

Thank you for responding so fast and for opening the discussion tab! As for my question, I still don't understand why I get this error but I found a way around it.

I had another question concerning the memory class. I am working on a project where the memory is externalized in another software called Digital. What I did was create my own memory class based on the original one and modified the read_byte(), read_word(), write_byte() and write_word() methods with my own code. Upon looking at the code of the original memory class, I came across fields named read_bus_response_queue and write_bus_queue. These fields seem unused and I wanted to know what their purpose was. Could you enlighten me about that? Thanks in advance!

[jedie]

Sorry. I can no longer remember that. Maybe the git history helps here?

[Riceeter]

No problem. I managed to make things work with my initial idea of making a new type of memory that sends TCP packets when the processor attempts to write/read in the memory. I was just asking out of curiosity.