AXIOMTEK SHB101 Series, User Manual, Page: 18 / 85

SHB101
LGA775 SBC User’s Manual
12 Board and Pin Assignments
2.4.7 CPU Fan Connector (FAN1)
A CPU fan is always needed for cooling CPU heat. The CPU fan connector FAN1
provides power to the CPU fan.
Pin Signal
1 Ground
2 +12V
3 Rotation Detection
4 Speed Control
2.4.8 System Fan Connectors (FAN2, FAN3)
You can connect the system cooling fan cable to FAN2/FAN3 for system cooling fan
power.
Pin Signal
1 GND
2 +12V
3 Rotation Detection
2.4.9 Floppy Disk Port Connector (FDD1)
The board provides a 34-pin header type connector, FDD1 , supporting up to two floppy
drives. The floppy drives may be any one of the following types: 5.25" 360KB/1.2MB and
3.5" 720KB/1.44MB/2.88MB.
Pin Signal Pin Signal Pin Signal
1 GND 2 Drive Density Select 3 GND
4 No connector 5 GND 6 No connector
7 GND 8 Index# 9 GND
10 Motor enable A# 11 GND 12 No connector
13 GND 14 Drive select A# 15 GND
16 No connector 17 GND 18 Direction#
19 GND 20 STEP# 21 GND
22 Write data# 23 GND 24 Write gate#
25 GND 26 Track 0 # 27 GND
28 Write protect# 29 No connector 30 Read data#
31 GND 32 Head selection# 33 No connector
34 Disk change#