Contec SBC Series User Manual

6. Software Utilities
46
PC-686BX(NLX)-LV, PC-686BX(NLX)-LVV
Speed Sensor
If a fan fitted with a speed sensor is used, the fan speed sensor signal is input to pin 3
of CN9.
This allows the user to read the fan speed.
Note!
If you wish to read the fan speed, you must use a fan with a speed
sensor.
W83781D Register
Two ports are provided for reading the W83781D hardware monitor register. The
two ports are described below.
Index register : 295h
Data register : 296h
Use of the index register is shown below.
<Example program: Read the chip ID register into bx>
mov ax, 4eh;
mov dx,295h;
out dx,ax; (Set the index register as the bank selection
register)
inc dx;
out dx,80h; (Set bank = 0)
mov ax,58h;
mov dx,295h;
out dx,ax; (Set the index register as the chip ID register)
inc dx;
in bx,dx; (Read the chip ID register to bx)

Contec SBC Series Specifications

General

Brand	Contec
Model	SBC Series
Category	Motherboard
Language	English