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AlphaServer 4000 I/O Interface Configuration Rules
•
The bridge modules connect the system motherboard to the PCI motherboard;
they are in slots IOD0/1 and IOD2/3 on the system motherboard.
•
The VGA module must be in a PCI0 slot.
•
The base PCI card cage has a PCI motherboard with five slots for PCI options
and three PCI/EISA combination slots.
•
The optional PCI card cage has a PCI motherboard with eight slots for PCI
options only.
•
In a dual PCI card cage system, PCI motherboards support four PCI buses and
one EISA bus.
Figure 1–13 shows the two PCI motherboards. At the rear of the system drawer, the
base PCI motherboard ( ) is located at the left side of the drawer; the optional PCI
motherboard ( ) is located at the right side.
Server Control Module
The server control module, located at the rear of the system drawer, has ports for the
following devices: terminal (COM1), keyboard, mouse, printer, modem, 12V power,
and an additional communications port (COM2).
Figure 1–14 Server Control Module Ports
Keyboard
COM1
Parallel
Port
Port
Port
12V Pwr
Modem
Mouse
COM2
Port
Port
PK-0624-96
Configuration Rules
1-21
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