NEMU(NJU Emulator) is a simple but complete full-system x86 emulator designed for teaching purpose. Small x86 programs can run under NEMU.

The main features of NEMU include

• a small monitor with a simple debugger
  • single step
  • register/memory examination
  • expression evaluation without the support of symbols
  • watch point
  • differential testing with QEMU
• CPU core with support of most common used x86 instructions in protected mode
  • real mode is not supported
  • x87 floating point instructions are not supported
• DRAM
• I386 paging with TLB
  • protection is not supported
• I386 interrupt and exception
  • protection is not supported
• 4 devices
  • serial, timer, keyboard, VGA
  • most of them are simplified and unprogrammable
• 2 types of I/O
  • port-mapped I/O and memory-mapped I/O