A-4
Sound Blaster I/O Address Maps
SB2.0 I/O Address Map
Sound Blaster 2.0 uses base I/O address 220h or 240h. These are jumper selectable.
Base Address
I/O
Addresses
Used
220h
220h to 22Fh
240h
240h to 24Fh
Table A-5: SB2.0 I/O Ports
The following table lists the functions of the I/O ports:
I/O Address
Description
Access
Base + 0h
C/MS Music Voice 1-6 Data Port
Write Only
Base + 1h
C/MS Music Voice 1-6 Register Port
Write Only
Base + 2h
C/MS Music Voice 7-12 Data Port
Write Only
Base + 3h
C/MS Music Voice 7-12 Register Port
Write Only
Base + 6h
DSP Reset
Write Only
Base + 8h
FM Music Status Port
Read
Base + 8h
FM Music Register Port
Write
Base + 9h
FM Music Data Port
Write Only
Base + Ah
DSP Read Data Port
Read Only
Base + Ch
DSP Write Command/Data
Write
Base + Ch
DSP Write-Buffer Status (Bit 7)
Read
Base + Eh
DSP Read-Buffer Status (Bit 7)
Read Only
Table A-6: SB2.0 I/O Port Functions
The C/MS Music Voice ports apply only when the C/MS chips are present.
FM music can also be accessed through I/O addresses 388H and 389H.