VT82C686B
Command Summary – Sound Processor
Type Command
Game Port Registers
These registers are fixed at the standard game port address of
201h.
#
10 Play
14 Play
91 Play
16 Play
17 Play
74 Play
75 Play
76 Play
77 Play
8 bits directly
8 bits via DMA
I/O Port 201h – Game Port Status ................................... RO
High-speed 8 bits via DMA
2-bit compressed via DMA
2-bit compressed via DMA with reference
4-bit compressed via DMA
4-bit compressed via DMA with reference
2.6-bit compressed via DMA
2.6-bit compressed via DMA with reference
7
6
5
4
3
2
1
0
Joystick B Button 2 Status
Joystick B Button 1 Status
Joystick A Button 2 Status
Joystick A Button 1 Status
Joystick B One-Shot Status for Y-Potentiometer
Joystick B One-Shot Status for X-Potentiometer
Joystick A One-Shot Status for Y-Potentiometer
Joystick A One-Shot Status for X-Potentiometer
20 Record Direct
24 Record Via DMA
99 Record High-speed 8 bits via DMA
I/O Port 201h – Start One-Shot.......................................WO
(Value Written is Ignored)
7-0
D1 Speaker Turn on speaker connection
D3 Speaker Turn off speaker connection
D8 Speaker Get speaker setting
40 Misc
48 Misc
80 Misc
D0 Misc
D4 Misc
E1 Misc
Set sample rate
Set block length
Set silence block
Stop DMA
Continue DMA
Get version
30 MIDI Direct MIDI input
31 MIDI MIDI input via interrupt
32 MIDI Direct MIDI input with time stamp
33 MIDI MIDI input via interrupt with time stamp
34 MIDI Direct MIDI UART mode
35 MIDI MIDI UART mode via interrupt
36 MIDI Direct MIDI UART mode with time stamp
37 MIDI MIDI UART mode via interrupt with time stamp
38 MIDI Send MIDI code
Revision 1.71 June 9, 2000
-53-
Register Descriptions - Super-I/O I/O Ports
ETC [ ETC ]
