Nuser.zip is a version of sersetup in DOOM1.2 which solves the problem of serial connection games slowing down after about 2mins of play Nuser.exe is the most uptodate version which also fixes the -irq and -port command line options. . If you want Doom to use this file as the default from setup you will have to rename it sersetup.exe Cheers David.Thomson@uk.ac.ncl