PORTIBM PC Portable (uses same BIOS as XT) 0284-0287 - Pro Audio Spectrum 16 (PAS16) Range: PORTIBM PC Portable (uses same BIOS as XT) 0280h, PORTIBM PC Portable (uses same BIOS as XT) 0284h, PORTIBM PC Portable (uses same BIOS as XT) 0288h, PORTIBM PC Portable (uses same BIOS as XT) 028Ch, PORTIBM PC Portable (uses same BIOS as XT) 384h, PORTIBM PC Portable (uses same BIOS as XT) 0388h (default), or PORTIBM PC Portable (uses same BIOS as XT) 038Ch