I want to run mame in a dos only system. I want mame to start up as soon as you turn on the computer, but before I put it in a spare computer that I have, I want to make sure I can get it to work.
Taskmagee, WinXP is fundamentally different from Win95/98. The earlier OSes were a graphical interface built on top of a DOS platform. It can be argued that Win95/98 aren't even OSes but very fancy applications that run in DOS.
WindowsXP is an actual OS and is not DOS based. Microsoft threw in a DOS emulator which you can run to start up command line programs, but because it doesn't run on DOS, there is no way to get a "DOS-only" version of XP, or boot to DOS etc. XP is simply not built that way.
If you want / need to run pure DOS, boot into DOS etc, you need to go back to Win98.