Power Supply
The auto-ranging 525 watt power supply, designed to minimize electromagnetic
interference (EMI) and radio frequency interference (RFI), provides sufficient power for
the system. The power supply automatically switches between these input voltage
ranges:
100-120 VAC at 50/60 Hz; 12 A maximum current
200-240 VAC at 50/60 Hz; 7 A maximum current
The power supply has three DC peripheral connectors for the accessible drive bays,
two mini-output connectors for use with the 3 1/2-inch diskette drives, one TTL output
connector for use with 5 1/4-inch peripherals or a
3 1/2-inch hard drive, and a separate connector that provides power directly to the
SCSI-2 SCA backplane.
An integral 35 cubic feet per minute (cfm) fan cools the power supply and helps to
cool the interior of the server.
EISA Expansion Slots
The six EISA bus slots on the system board provide for expansion and performance
enhancement. Two of these slots share a common chassis I/O expansion slot with
two of the PCI slots. If you use these EISA slots, you cannot use the PCI slots and
visa versa.
All six slots have the capability of being bus masters. When EISA masters arbitrate
for the bus, not all slots are created equal. The following pairs of slots share
arbitration requests: 1 and 2, 3 and 4, and 5 and 6. Therefore, in the scheme of
letting EISA masters take over the bus, ownership of it occurs in the following
sequence: 1, 2, 3, 4, 5, 6, 1, 2, 3, 4, 5, 6, 1, 2, 3, 4, 5, 6, etc.
The EISA bus, an extension of the Industry Standard Architecture (ISA) bus,
provides:
32-bit memory addressing
Type A transfers at 5.33 MB per second
Type B transfers at 8 MB per second
burst transfers at 33 MB per second
8-, 16-, or 32-bit data transfers
automatic translation of bus cycles between EISA and ISA masters
interrupt sharing.
Since EISA is fully backward compatible with ISA, you can install old or new ISA
