Creative SB0350 Hardware Programming Guide - Page 116
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A-2 Sound Blaster I/O Address Maps SB1.5 I/O Address Map Sound Blaster version 1.5 or earlier uses I/O addresses 2x0h - 2xFh, where x is number from 1 to 6. Base Address 210h 220h 230h 240h 250h 260h I/O Addresses Used 210h to 21Fh 220h to 22Fh 230h to 23Fh 240h to 24Fh 250h to 25Fh 260h to 26Fh Table A-1: SB1.5 I/O Ports The following table lists the functions of the I/O ports: I/O Address Base + 0h Base + 1h Base + 2h Base + 3h Base + 6h Base + 8h Base + 8h Base + 9h Base + Ah Base + Ch Base + Ch Base + Eh Description C/MS Music Voice 1-6 Data Port C/MS Music Voice 1-6 Register Port C/MS Music Voice 7-12 Data Port C/MS Music Voice 7-12 Register 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) Access Write Only Write Only Write Only Write Only Write Only Read Write Write Only Read Only Write Read Read Only Table A-2: SB1.5 I/O Port Functions The C/MS Music Voice ports apply only when C/MS chips are present. FM music can also be accessed through I/O addresses 388h and 389h.