22.26 Rebooting the PC from a DJGPP program

Q: How can I reboot the PC from a DJGPP program?

A: There are several possible ways to achieve this:

• In plain DOS, have your code call the INT 19h handler via __dpmi_int instruction. (Emitting the literal INT 19h instruction won't work with CWSDPMI, because CWSDPMI deliberately blocks it; version r5 of CWSDPMI might remove this restriction.)
• On Windows, emitting the literal INT 19h instruction is a better alternative, since Windows misbehaves when INT 19h is issued via __dpmi_int.
• Send the FEh command to the port 64h:

   outportb (0x64, 0xfe);
  

  (this should be preceded by a test whether the keyboard buffer is full; because then the keyboard will ignore the command; however, keyboard-full is a very rare condition).