VT82C686B

Manufacturer Part NumberVT82C686B
ManufacturerETC-unknow
VT82C686B datasheet
 
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Offset 81 – ISA Positive Decoding Control 1 .................. RW
7
On-Board I/O Port Positive Decoding
0
Disable ...................................................default
1
Enable
6
Microsoft-Sound
System
Decoding
0
Disable ...................................................default
1
Enable
5-4
Microsoft-Sound System I/O Decode Range
00 0530h-0537h ..........................................default
01 0604h-060Bh
10 0E80-0E87h
11 0F40h-0F47h
3
APIC Positive Decoding
0
Disable ...................................................default
1
Enable
2
BIOS ROM Positive Decoding
0
Disable ...................................................default
1
Enable
1
Reserved
........................................ always reads 0
0
PCS0 Positive Decoding
0
Disable ...................................................default
1
Enable
Offset 82 – ISA Positive Decoding Control 2 .................. RW
7
FDC Positive Decoding
0
Disable ...................................................default
1
Enable
6
LPT Positive Decoding
0
Disable ...................................................default
1
Enable
5-4
LPT Decode Range
00 3BCh-3BFh, 7BCh-7BEh.......................default
01 378h-37Fh, 778h-77Ah
10 278h-27Fh, 678h-67Ah
11 -reserved-
3
Game Port Positive Decoding
0
Disable ...................................................default
1
Enable
2
MIDI Positive Decoding
0
Disable ...................................................default
1
Enable
1-0
MIDI Decode Range
00 300h-303h ..............................................default
01 310h-313h
10 320h-323h
11 330h-333h
Revision 1.71 June 9, 2000
Offset 83 – ISA Positive Decoding Control 3 .................. RW
7
I/O
Port
Positive
6-4
3
2-0
Offset 84 – ISA Positive Decoding Control 4 .................. RW
7-4
3
2
1-0
-65-
COM Port B Positive Decoding
0
Disable................................................... default
1
Enable
COM-Port B Decode Range
000 3F8h-3FFh (COM1)............................ default
001 2F8h-2FFh (COM2)
010 220h-227h
011 228h-22Fh
100 238h-23Fh
101 2E8h-2EFh (COM4)
110 338h-33Fh
111 3E8h-3EFh (COM3)
COM Port A Positive Decoding
0
Disable................................................... default
1
Enable
COM-Port A Decode Range
000 3F8h-3FFh (COM1)............................ default
001 2F8h-2FFh (COM2)
010 220h-227h
011 228h-22Fh
100 238h-23Fh
101 2E8h-2EFh (COM4)
110 338h-33Fh
111 3E8h-3EFh (COM3)
Reserved
........................................always reads 0
FDC Decoding Range
0
Primary .................................................. default
1
Secondary
Sound Blaster Positive Decoding
0
Disable................................................... default
1
Enable
Sound Blaster Decode Range
00 220h-22Fh, 230h-233h .......................... default
01 240h-24Fh, 250h-253h
10 260h-26Fh, 270h-273h
11 280h-28Fh, 290h-293h
Function 0 Registers - PCI to ISA Bridge
VT82C686B