PORTIBM PC Portable (uses same BIOS as XT) 0220-0223 - Sound Blaster / Adlib port (Stereo) SeeAlso: PORTIBM PC Portable (uses same BIOS as XT) 0388h-0389h 0220 R- Left speaker -- Status port 0220 -W Left speaker -- Address port 0221 -W Left speaker -- Data port 0222 R- Right speaker -- Status port 0222 -W Right speaker -- Address port 0223 -W Right speaker -- Data port