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Exception at EIP=0000000001fb91ee (portfolio_rom_card_t::nrdi_r(address_space&, unsigned int)+0x000e): ACCESS VIOLATION
While attempting to read memory at 0000000000000000
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RAX=0000000000000000 RBX=00000000000c0000 RCX=000000000c502d20 RDX=0000000011cd3b80
RSI=000000000c4d4f40 RDI=0000000011cd3b80 RBP=0000000000228110 RSP=0000000000228110
 R8=0000000000000000 R9=00000000000000ff R10=0000000001fb9200 R11=00000000000000ff
R12=0000000000000001 R13=00000000000e0031 R14=0000000000000000 R15=0000000000228428
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Stack crawl:
  0000000000228110: 0000000001fb91ee (portfolio_rom_card_t::nrdi_r(address_space&, unsigned int)+0x000e)
  0000000000228180: 00000000004e1052 (portfolio_state::mem_r(address_space&, unsigned int, unsigned char)+0x01a2)
  00000000002281c0: 00000000047e05da (delegate_base<unsigned char, address_space&, unsigned int, unsigned char>::operator()(address_space&, unsigned int, unsigned char) const+0x003a)
  00000000002281f0: 000000000402d0d9 (address_space_specific<unsigned char, (endianness_t)0, true>::read_native(unsigned int, unsigned char)+0x0089)
  0000000000228240: 000000000402dbf0 (address_space_specific<unsigned char, (endianness_t)0, true>::read_word_unaligned(unsigned int)+0x0020)
  0000000000228280: 000000000231007e (i8086_common_cpu_device::GetRMWord() [clone .part.37]+0x002e)
  00000000002283a0: 000000000231a2e8 (i8086_common_cpu_device::common_op(unsigned char)+0x81e8)
  00000000002284e0: 00000000023113d5 (i8086_cpu_device::execute_run()+0x0115)
  0000000000228590: 0000000003231118 (device_scheduler::timeslice()+0x0188)
  0000000000228690: 00000000031ed52b (running_machine::run(bool)+0x03fb)
  000000000022f440: 0000000001bdb8ea (mame_machine_manager::execute()+0x00ea)
  000000000022f540: 0000000001c39645 (cli_frontend::start_execution(mame_machine_manager*, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >&)+0x01d5)
  000000000022f6b0: 0000000001c39835 (cli_frontend::execute(std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >&)+0x0045)
  000000000022f710: 0000000001bd9b5a (emulator_info::start_frontend(emu_options&, osd_interface&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >&)+0x002a)
  000000000022fdb0: 0000000001b2fcc2 (utf8_main(std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >&)+0x0122)
  000000000022fe50: 0000000003764449 (wmain+0x0169)
  000000000022ff20: 0000000000401410 (__tmainCRTStartup+0x0260)
  000000000022ff50: 000000000040153b (mainCRTStartup+0x001b)
  000000000022ff80: 00000000776059cd (BaseThreadInitThunk+0x000d)
  000000000022ffd0: 000000007773a561 (RtlUserThreadStart+0x0021)