/* setup basic memory access */
cpu_register_physical_memory(0xc0000, 0x10000, 0xc0000 | IO_MEM_ROM);
+ cpu_register_physical_memory(0xd0000, 0x20000, IO_MEM_UNASSIGNED);
cpu_register_physical_memory(0xf0000, 0x10000, 0xf0000 | IO_MEM_ROM);
bochs_bios_init();