VT82C686B

Manufacturer Part NumberVT82C686B
ManufacturerETC-unknow
VT82C686B datasheet
 


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I/O Base 1 Registers – Audio FM NMI Status Registers
These registers are accessable through function 5 only.
I/O Offset 0 – FM NMI Status .......................................... RO
7-2
Reserved
........................................ always reads 0
1-0
FM NMI Status
00 Undefined
01 OPL3 Bank 0
10 OPL3 Bank 1
11 Undefined
I/O Offset 1 – FM NMI Data ............................................. RO
7-0
FM NMI Data
This register allows readback of the data written to
the FM data port
I/O Offset 2 – FM NMI Index ........................................... RO
7-0
FM NMI Index
This register allows readback of the data written to
the FM index port
Revision 1.71 June 9, 2000
I/O Base 2 Registers – MIDI / Game Port
I/O Offset 1-0 – MIDI Base .............................................. RW
15-0 MIDI Port Base Address.................. default = 0330h
I/O Offset 3-2 – Game Port Base ..................................... RW
15-0 Game Port Base Address ................. default = 0200h
These registers are functional only if Rx42[6] = 1
I/O Base 3 Registers – Codec Register Shadow
These registers are accessable through both functions 5 and 6.
I/O Offset 0-7Fh – Primary Codec Shadow .................... RW
The content of these registers is updated when writing data to
primary codec registers 0-7Fh or when valid primary codec
register status is returned.
I/O Offset 80-FFh – Secondary Codec Shadow .............. RW
The content of these registers is updated when writing data to
secondary codec registers 0-7Fh or when valid secondary
codec register status is returned.
-114-
Function 5 & 6 Registers - AC97 Audio & Modem Codecs
VT82C686B