Digital Equipment Digital AlphaStation 400 Series, User Information

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Technical Specifications
Expansion Slots
The motherboard contains two PCI, three ISA, and one combination PCI/ISA expansion
slots. The maximum ava5 V DC current allowable to any expansion slot depends
on the following parameters:
•
Power supply capacity
•
+5 V DC requirements of the motherboard
•
+5 V DC requirements of the peripherals
•
Power demands of all other slots in use
Power Supply and Input Power Requirements
The 300-watt power supply provides five dc voltages: +12 V, -12 V, +5 V, -5 V, and
+3.3V DC. These voltages are used by the various components within the system. Table
C-9 lists the input power requirements.
Table C-9. System Input Power Requirements
Rated Voltage Range Maximum Range Rated
Input
Current
1
Operating
Frequency
Range
100 V AC - 120 V AC 88 V AC - 132 V AC 8 A 47 Hz - 63 Hz
220 V AC - 240 V AC 176 V AC - 264 V AC 4 A 47 Hz - 63 Hz
1 Includes outlet current.
Motherboard Jumpers
Jumper pins allow you to set specific system parameters. Set them by changing the pin
location of jumper blocks. (A jumper block is a small plastic-encased conductor [shorting
plug] that slips over the pins.) To change a jumper setting, remove the jumper from its
current location with your fingers or small needle-nosed pliers. Place the jumper over the
two pins designated for the desired setting. Press the jumper evenly onto the pins. Be
careful not to bend the pins.
Figure C-1 shows the locations of the motherboard jumper pins. Table C-10 lists the
motherboard jumpers and factory-default settings. Note that the square pin of each jumper
block is pin 1.
F
For information on the CPU module jumpers, see the Digital AlphaStation 400
Series CPU Module Information.
C-6