Asus PSCH-SR/SCSI - Manual (Page 46)

2-28 Chapter 2: Hardware information
1. Do not forget to connect the 4-pin ATX +12V power plug.
Otherwise, the system does not boot up.
2. Make sure that your ATX 12 V power supply can provide 8A on the
+12V lead and at least 1A on the +5-volt standby lead (+5VSB).
The minimum recommended wattage is 300W. The system may
become unstable or may not boot up if the power is inadequate.
9. ATX power connectors (20-pin ATXPWR1, 4-pin ATX12V1)
These connectors connect to an ATX 12 V power supply. The plugs
from the power supply are designed to fit these connectors in only one
orientation. Find the proper orientation and push down firmly until the
connectors completely fit.
In addition to the 20-pin ATXPWR1 connector, connect the 4-pin ATX
+12V power plug to provide sufficient power to the CPU.
10. Floppy disk drive connector (34-1 pin FLOPPY1)
This connector supports the provided floppy drive ribbon cable. After
connecting one end to the motherboard, connect the other end to the
floppy disk drive. (Pin 5 is removed to prevent incorrect insertion when
using FDD cables with a closed pin 5 hole).
PSCH-SR
®
NOTE: Orient the red markings on
the floppy ribbon cable to PIN 1.
PSCH-SR Floppy Disk Drive Connector
PIN 1
FLOPPY1
PSCH-SR
®
PSCH-SR ATX Power Connectors
ATXPWR1
Pin 1
+3.3VDC
-12.0VDC
GND
PS_ON#
GND GND GND
-5.0VDC +5.0VDC +5.0VDC
PWR_OK +12.0VDC +3.3VDC +3.3VDC GND +5.0VDC GND +5.0VDC GND +5VSB
ATX12V1
+12V DC
GND
+12V DC
GND