Creative SB0350 Hardware Programming Guide - Page 120

A-6 Sound Blaster I/O Address Maps SBPRO I/O Address Map Sound Blaster Pro uses base I/O address 220h or 240h. These are jumper selectable. Base Address 220h 240h I/O Addresses Used 220h to 233h 240h to 253h Table A-9: SBPRO I/O Ports There are two versions of Sound Blaster Pro. The difference is in the FM chip used. The earlier version uses a two-operator FM (OPL2) chip, while the later version uses a four-operator FM (OPL3) chip. The following table lists the functions of the I/O ports on the Sound Blaster Pro that uses the OPL2 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 Left FM Music Status Port Left FM Music Register Address Port Left FM Music Data Port Right FM Music Status Port Right FM Music Register Address Port Right 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-10: SBPRO with OPL2 I/O Port Functions