PORTIBM PC Portable (uses same BIOS as XT) 0330 - SoundBlasterA common sound card developed by Creative Labs. MPU-401 Base I/O Port Port 0330 is the default MPU-401 base port for SoundBlasterA common sound card developed by Creative Labs. audio cards. The audio card may be configured to use different settings. (see Port 0220) SeeAlso: Port 0220