Specifications

A.3 Power Supply and Input Power Requirements
The power supply provides four dc voltages: +12 Vdc, –12 Vdc, +5 Vdc, and
–5 Vdc. These voltages are used by the various components within the system.
Table A–5 lists the power requirements.
Table A–5 System Power Requirements
Parameter Specification
AC voltage (nominal) 110/120 V or 220/240 V (autosensing)
Frequency (nominal) 60 Hz or 50 Hz
AC phases 1
AC power input (maximum, including
auxiliary ac outlet)
840 W
AC power output 350 W
Inrush current (maximum) 50 A
Auxiliary ac output current (maximum)
110/120 V
220/240 V
3.0 A
1.5 A
A.4 Expansion Slot Current Limitations
The system board contains eight EISA bus master expansion slots, which are
also ISA compatible. The maximum +5 Vdc current for any expansion slot
depends upon the following four parameters:
• Power supply capacity of 35 A at +5 Vdc
• The +5 Vdc requirements of the board set, including CPU and memory
modules
• The +5 Vdc requirements of the peripherals
• The power demands of all other slots in use
Caution
Each EISA bus expansion board is limited to 4.5 A at +5 Vdc maximum.
The power supply supports 8 EISA options at an average of 2.0 A per
option. Do not exceed 35 A when computing the total +5 Vdc current
drain for the system board (including options, memory, and CPU). This
avoids damage to the power supply and system board.
System Specifications A–3