VT82C686B

Manufacturer Part NumberVT82C686B
ManufacturerETC-unknow
VT82C686B datasheet
 
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Index F6 – Floppy Controller Configuration .................. RW
7-6
Reserved
........................................ always reads 0
5
Floppy Drive On Parallel Port
0
Parallel Port (SPP) Mode .......................default
1
FDC Mode
This bit is used in notebook applications to allow
attachment of an external floppy drive using the
parallel port I/O connector:
SPP Mode
Pin Type
FDC Mode Pin Type
STROBE#
I/O
-
PD0
I/O
INDEX#
PD1
I/O
TRK00#
PD2
I/O
WRTPRT#
PD3
I/O
RDATA#
PD4
I/O
DSKCHG#
PD5
I/O
-
PD6
I/O
-
PD7
I/O
-
ACK#
I
DS1#
BUSY
I
MTR1#
PE
I
WDATA#
SLCT
I
WGATE#
AUTOFD#
I/O
DRVEN0
ERROR#
I
HDSEL#
PINIT#
I/O
DIR#
SLCTIN#
I/O
STEP#
4
3-Mode FDD
0
Disable ...................................................default
1
Enable
3
Reserved
........................................ always reads 0
2
Four Floppy Drive Option
0
Internal 2-Drive Decoder .......................default
1
External 4-Drive Decoder
1
FDC DMA Non-Burst
0
Burst .....................................................default
1
Non-Burst
0
FDC Swap
0
Disable ...................................................default
1
Enable
Revision 1.71 June 9, 2000
Index F8 – Floppy Drive Control .................................... RW
7-6
Floppy Drive 3 (see table below)
5-4
Floppy Drive 2 (see table below)
3-2
Floppy Drive 1 (see table below)
1-0
Floppy Drive 0 (see table below)
DRVEN1
00
DRATE0
01
DRATE0
10
DRATE0
n/a
11
DRATE1
I
I
I
I
I
n/a
n/a
n/a
O
O
O
O
O
O
O
O
-47-
Register Descriptions - Super-I/O I/O Ports
VT82C686B
DRVEN0
DENSEL
DRATE1
DENSEL#
DRATE0