I/O Address Selection; I/O Address Map - Creative SOUND BLASTER PRO User Reference Manual

SOUND BLASTER
Appendix B
I/o Address
Selection
The Sound Blas er Pro uses 24 consecu ive I/O addresses. There are wo
choices of I/O Base address.
Base Address
I/O Addresses used
220H
220H o 237H
240H
240H o 257H
I/O Address
Map
200H - 207H ....Game por (read/wri e)
Base + OH FM music S a us Por (read)
Base + OH FM music Regis er Address Por (wri e)
Base + 1 H FM music Da a Por (wri e)
Base + 2H Advanced FM music S a us Por (read)
Base+ 2H Advanced FM music Regis er Address Por ..(wri e)
Base + 3H Advanced FM music Da a Por (wri e)
Base + 4H Mixer chip Regis er Address Por (wri e)
Base + 5H Mixer chip Da a Por (read/wri e)
Base + 6H DSP Rese
(wri e)
Base + 8H FM music S a us Por (read)
Base + 8H FM music Regis er Address Por (wri e)
Base + 9H FM music Da a Por (read)
Base + OAH DSP Read Da a (read)
Base + OCH DSP Wri e Da a or Command (wri e)
Base + OCH DSP Wri e Buffer S a us (Bi 7) (read)
Base + OEH DSP Da a Available S a us (Bi 7) (read)
38AH - 39FH (reserved)
Base + 1 0H ..
Base + 11H ..
...CD-ROM da a regis er ......................... ...... (read/wri e)
.................. (read)
...CD-ROM s a us regis er .....................
Base + 12H .. ...CD-ROM rese regis er ........................ ................. (wri e)
Base + 13H .. ...CD-ROM enable regis er .................... ................. (wri e)
388H .............. ... FM music S a us Por ........................... . . ................ (read)
388H .............. ... FM music Regis er Address Por
389H .............. . ... FM music Da a Por .............................. ................. (wri e)
■ b Appendixes