User`s manual

SBC81203 LGA775 SBC User’s Manual
Jumpers and Connectors
12
2.4.4 ATX 4 Pin 12V In Connector (CN2)
You can connect it to the ATX12V power supply for CPU Core Voltage.
Note: Make sure your ATX12V power supply can provide 16A on the
+12V lead and at least 1A on the +5V standby lead (+5VSB).
The minimum recommended wattage is 250W or 300W for a
fully configured system. The system may become unstable and
may experience difficulty powering up if the power supply is
inadequate.
Pin Signal
1 GND
2 GND
3 +12V
4 +12V
2.4.5 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 Reduce write current 3 GND
4 N/C 5 GND 6 N/C
7 GND 8 Index # 9 GND
10 Motor enable A # 11 GND 12 Drive select B #
13 GND 14 Drive select A # 15 GND
16 Motor enable B # 17 GND 18 Direction #
19 GND 20 STEP # 21 GND
22 Write data # 23 GND 24 Write gate #
25 GND 26 Track # 27 GND
28 Write protect # 29 GND 30 Read data #
31 GND 32 Side 1 select # 33 GND
34 Disk change #