I don't want to take this off subject, but for the note, the ADOOM source has been ported to the Dreamcast and works beautifully on there!
I wish I could help with your problem, but my A600 is not fast enough to run DOOM. Though if you do get it running, and you got a Windows box. I highly suggest checking out the
http://www.doomworld.com and get into DOOM Editing! It is so easy and so much fun, not to mention portable as you'll find ports of DOOM on about everything. Probably even a toaster or alarm clock at the rate the ports are being churned out.
I personally edit for PrBOOM which is on Amiga OS 4, Haiku, Windows, and NEEDS an AROS port hard core!!! (does this also work with MorphOS?)
And of course GzDOOM which only works in Windows and Linux atm.
