Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!samsung!sdd.hp.com!hplabs!hpl-opus!hpcc05!hpcc01!aliamus
From: aliamus@hpcc01.HP.COM (Steve Aliamus)
Newsgroups: comp.os.msdos.programmer
Subject: Re: MSDOS "reboot" program
Message-ID: <1570001@hpcc01.HP.COM>
Date: 3 Oct 90 17:15:58 GMT
References: <68@beep.UUCP>
Organization: HP Corp Computing & Services
Lines: 15

Here is the one I use:

C:\> debug
-a
XXXX:0100 jmp ffff:0000
XXXX:0105
-rcx
CX 0000
:5
-n reboot.com
-w
Writing 0005 bytes
-q

That's it.  I believe this code generates a "cold" reboot.