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Exception at EIP=02b87019 (floppy_image::get_actual_geometry(int&, int&)+0x0009): ACCESS VIOLATION
While attempting to read memory at 00000104
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Stack crawl:
  0028c108: 02b87019 (floppy_image::get_actual_geometry(int&, int&)+0x0009)
  0028c138: 0233dac2 (floppy_image_device::twosid_r()+0x0032)
  0028c148: 0122adf0 (altos5_state::port08_r(address_space&, unsigned int, unsigned char)+0x0020)
  0028c178: 02a7cd98 (devcb_read_base::read8_adapter(address_space&, unsigned int, unsigned long long)+0x0058)
  0028c1b8: 02566418 (z80pio_device::read(address_space&, unsigned int, unsigned char)+0x00b8)
  0028c1d8: 0393dc66 (delegate_base<unsigned char, address_space&, unsigned int, unsigned char>::operator()(address_space&, unsigned int, unsigned char) const+0x0036)
  0028c1f8: 036eac4c (address_space_specific<unsigned char, (endianness_t)0, false>::read_byte(unsigned int)+0x005c)
  0028c238: 0324ce28 (z80_device::op_db()+0x0058)
  0028c298: 02303c65 (z80_device::execute_run()+0x07a5)
  0028c308: 02b32554 (device_scheduler::timeslice()+0x01a4)
  0028c368: 02aff3b9 (running_machine::run(bool)+0x0199)
  0028f948: 017721d4 (mame_machine_manager::execute()+0x0184)
  0028fbe8: 017d08c2 (cli_frontend::execute(int, char**)+0x0e62)
  0028fc18: 01771184 (emulator_info::start_frontend(emu_options&, osd_interface&, int, char**)+0x0034)
  0028fe48: 016ddd88 (utf8_main(int, char**)+0x0128)
  0028fec8: 02ee1a01 (wmain+0x0161)
  0028ff88: 004013f0 (__tmainCRTStartup+0x0280)
  0028ff94: 7529338a (BaseThreadInitThunk+0x0012)
  0028ffd4: 77949902 (RtlInitializeExceptionChain+0x0063)
  0028ffec: 779498d5 (RtlInitializeExceptionChain+0x0036)