Acer Veriton 9100 User manual

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CPU Board
CPU Board 2-1
The CPU board carries two sockets to support a powerful dual-CPU
configuration. The sockets accommodate the new Intel Pentium II
CPU running at 233/266 MHz. The Pentium II CPU incorporates the
first-level cache and boasts a new generation of power.
The board comes with four DRAM banks composed of four 168-pin
dual-inline memory module (DIMM) sockets that accommodate both
fast-page mode and EDO (extended data output) DIMMs.
Designed to work with Intel 440FX PCIset, the board includes the PCI
bridge/memory controller (PMC) and the data bus accelerator (DBX)
chipsets. The PMC provides bus control signals and address paths for
transfers between the host bus, PCI bus, and the main memory. The
DBX supports multiple-bit error detection and single-bit error correction
through the ECC/parity feature.

2-2 User’s Guide
2.1 Layout
Figure 2-1 CPU Board Layout
2.2 Jumper Locations
Figure 2-2 Pentium II CPU Board Jumper Locations
Pentium II CPU Socket 1
CPU Voltage Regulators
DIMM Sockets
Pentium II CPU Socket
2

CPU Board 2-3
2.3 Jumper Settings
Table 2-1 Settings for CPU Core/Bus Frequency Ratio (JP1)
JP1 Settings
1-2 3-4 5-6 7-8 CPU Core/Bus Freq.
1111 2
1101 3
1110 4
1100 2.5
1001 3.5
*
0 - Pins open 1 - Pins Closed
Table 2-2 ITP Debug Port (JP2)
JP2
1-2 2-3 ITP
1 0 CPU 1*
0 1 CPU 2
0 - Pins open 1 - Pins closed
Table 2-3 Clock Settings (JP5)
JP5 CPU
1-2 2-3 Clock Speed
1 0 66 MHz*
0 1 60 MHz
0 - Pins open 1 - Pins closed
*Default setting

2-4 User’s Guide
2.4 Memory Upgrade
The system board comes with eight 168-pin sockets, labeled DIMM1
to DIMM4, that accommodate single-density and double-density
DIMMs. The sockets support both the fast-page mode and EDO
DIMMs for a total of 512-MB system memory using 128-MB DIMMs.
Table 2-4 lists some possible memory configurations.
2.4.1 Memory Configurations
Table 2-4 Memory Configurations
DIMM1 DIMM2 DIMM3 DIMM4 Total Memory
32 MB 32 MB
32 MB 32 MB 64 MB
32 MB 32 MB 32 MB 96 MB
32 MB 32 MB 32 MB 32 MB 128 MB
32 MB 32 MB 64 MB 64 MB 192 MB
64 MB 64 MB
64 MB 64 MB 128 MB
64 MB 64 MB 64 MB 192 MB
64 MB 64 MB 64 MB 64 MB 256 MB
64 MB 64 MB 128 MB 128 MB 384 MB
128 MB 128 MB
128 MB 128 MB 256 MB
128 MB 128 MB 128 MB 384 MB
128 MB 128 MB 128 MB 128 MB 512 MB
The above configurations are only some of
the available memory combinations. When
upgrading memory, simply install DIMMs into
any of the empty sockets.

CPU Board 2-5
2.4.2 Installing a DIMM
To install a DIMM, align it with the socket and press it down until the
holding clips secure the DIMM in place.
The DIMM socket is slotted to ensure proper
installation. If you slip in a DIMM but does
not completely fit, you may have inserted it
the wrong way. Reverse the orientation of
the DIMM.
Figure 2-3 Installing a DIMM

2-6 User’s Guide
2.4.3 Removing a DIMM
To remove a DIMM, press the holding clips on both sides of the socket
outward to release the DIMM.
Place your forefingers on the top of the DIMM
before you press the holding clips to gently
disengage the DIMM from the socket.
Figure 2-4 Removing a DIMM

CPU Board 2-7
2.4.3 Reconfiguring the System
You must enter Setup after installing or removing SIMMs to
reconfigure the system.
Follow these steps to reconfigure the system:
1. Turn the system on. A memory error message appears,
indicating that the total memory does not match the value stored
in CMOS.
2. Press + + to enter Setup. A warning message
appears indicating an incorrect memory configuration.
3. Press twice to exit and reboot the system.
The system boots with the new memory configuration.

2-8 User’s Guide
2.5 Installing the Processor Heat Sink
and Fan
The Pentium II processor module comes with holes on one side to
hold the clips of the heat sink and fan. The upper set of holes (near
the latches) on the processor are wider and should match the wider
ends of the clips on the heat sink. The lower set of holes are smaller
and should match the narrow ends of the heat sink clips.
Figure 2-5 Matching the Fan-Heat Sink Clips with the Holes on
the Processor
Wide Holes
Narrow Holes
Wide Clip Ends

CPU Board 2-9
Follow these steps when installing the heat sink and fan to the
Pentium II processor module:
1. Remove the thermal tape protector at the back of the heat sink.
2. Insert the wide clip ends to the wide holes on the processor and
the narrow clip ends to the narrow holes.
Figure 2-6 Inserting the Clip Ends to the Processor Holes
3. Use a screwdriver to press and lock in the wide end of a clip first.
Then without lifting the screwdriver, point it downward to press
and lock the narrow end of the clip. See Figures 7 and 8 for the
illustration of this step.

2-10 User’s Guide
Figure 2-7 Locking a Wide Clip End
Figure 2-8 Locking a Narrow Clip End
4. Repeat step 3 to lock the other clip.