PORTIBM PC Portable (uses same BIOS as XT) 0338 - AdLib sound card - I/O port
Port 0388 - register port (write) status port (read) (see #P2001)
Port 0389 - data port (write only)
After writing to the register port a short delay of 3.3 microseconds is
required before sending data. After writing the data, an additional
delay of 23 microseconds is required after sending the data before
accessing the sound card again.
Sound Card status bits:
bit description (Table P2001)
7 set if either timer has expired
6 set if timer 1 expired
5 set if timer 2 expired
SeeAlso: Port 0220, Port 0330