VT82C686B
I/O Registers – SoundBlaster Pro
I/O Registers – Game Port
Offset SB Pro Registers (220 or 240h typ) Default Acc
Offset Game Port (200-20F typical)
Default Acc
0
1
2
3
4
5
6
7
8
FM Left Channel Index / Status
FM Left Channel Data
FM Right Channel Index / Status
FM Right Channel Data
Mixer Index
Mixer Data
Sound Processor Reset
-reserved-
FM Index / Status (Both Channels)
FM Data (Both Channels)
Sound Processor Data
-reserved-
Sound Processor Command / Data
Sound Processor Buffer Status
-reserved-
RW
WO
RW
WO
WO
RW
WO
--
RW
WO
RO
--
WR
RD
--
RO
--
0
1
1
-reserved-
Game Port Status
Start One-Shot
00
--
RO
WO
--
2-F -reserved-
00
00
00
9
A
B
C
D
E
F
00
00
Snd Processor Data Available Status
-reserved-
Port SB Pro Regs (same as offsets 8 & 9) Default Acc
388h FM Index / Status
389h FM Data
RW
WO
The above group of registers emulates the “FM”, “Mixer”, and
“Sound Processor” functions of the SoundBlaster Pro.
Revision 1.71 June 9, 2000
-38-
Register Overview
ETC [ ETC ]
