Creative SB0350 Hardware Programming Guide - Page 121

Sound Blaster I/O Address Maps A-7 The following table lists the functions of the I/O ports on the Sound Blaster Pro that uses the OPL3 chip: I/O Address Base + 0h Base + 0h Base + 1h Base + 2h Base + 2h Base + 3h Base + 4h Base + 5h Base + 6h Base + 8h Base + 8h Base + 9h Base + Ah Base + Ch Base + Ch Base + Eh Base + 10h Base + 11h Base + 12h Base + 13h Description FM Music Status Port FM Music Register Address Port FM Music Data Port Advanced FM Music Status Port Advanced FM Music Register Address Port Advanced FM Music Data Port Mixer chip Register Address Port Mixer chip Data Port DSP Reset FM Music Status Port FM Music Register Port FM Music Data Port DSP Read Data Port DSP Write Command/Data DSP Write-Buffer Status (Bit 7) DSP Read-Buffer Status (Bit 7) CD-ROM Command or Data Register CD-ROM Status Register CD-ROM Reset Register CD-ROM Enable Register Access Read Write Write Only Read Write Write Only Write Only Read/Write Write Only Read Write Write Only Read Only Write Read Read Only Read/Write Read Only Write Only Write Only Table A-11: SBPRO with OPL3 I/O Port Functions FM music can also be accessed through I/O addresses 388h and 389h. I/O addresses from 38Ah to 39Fh are reserved for future expansion.