Specifications

Sound Blaster I/O Address Maps A-5
SB2CD I/O Address Map
Sound Blaster 2.0 CD Interface uses base I/O address 250h or 260h. These are
jumper selectable.
Base Address I/O Addresses Used
250h 250h to 255h
260h 260h to 265h
Table A-7: SB2CD I/O Ports
The following table lists the functions of the I/O ports:
I/O Address Description Access
Base + 0h CD-ROM Command or Data Register Read/Write
Base + 1h CD-ROM Status Register Read Only
Base + 2h CD-ROM Reset Register Write Only
Base + 3h CD-ROM Enable Register Write Only
Base + 4h Mixer chip Register Address Port Write Only
Base + 5h Mixer chip Data Port Read/Write
Table A-8: SB2CD I/O Port Functions