Acer 12000 Manuale utente
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System Board
System Board 1-1
1.1 Features
The M21A is a dual-processor system board built on an extended ATX
baseboard utilizing two Intel Pentium II Xeon processors running at
400/100 and 450/100 MHz. It is integrated with the Intel 440GX system
controller, which consists of the PCI/AGP controller and the PCI/ISA
IDE accelerator (PIIX4E).
The Pentium II Xeon processor like its predecessor, the Pentium Pro
and Pentium II processor, implements a Dynamic Execution micro-
architecture - a unique combination of multiple branch prediction, data
flow analysis, and speculative execution. This means that the Pentium
II Xeon can deliver higher performance than the Pentium processor
while maintaining binary compatibility with all previous Intel
Architecture processors.
Also, the Pentium II Xeon processor is available in 512K, 1MB, and
2MB L2 cache options with the introduction of the Slot 2 socket.
Unlike Slot 1 Pentium IIs, which access the L2 at half the processor
speed, the Slot 2 access the L2 at full processor clock speed.
The PCI/AGP controller host bus interface supports a Pentium II Xeon
processor with 100 MHz bus frequency. It also provides a 72-bit
DIMM that supports synchronous DRAM (SDRAM) DIMMs. The
PCI/AGP controller introduces a new technology, which is the
Accelerated Graphics Port (AGP) interface. Supporting up to
533MB/sec MHz data transfer rate, the AGP interface boosts graphics
performance.
1-2 User’s Guide
The PIIX4E is a multifunctional PCI device controller implementing
system functions including PCI IDE, universal serial bus (USB)
host/hub, and enhanced power management. It also supports Ultra
DMA/33 synchronous DMA-compatible devices.
The four DIMM sockets on board allow memory upgrade to a
maximum of 2048 MB and supports 72-bit DIMM using synchronous
DRAM (SDRAM) DIMMs.
Two 16-bit fast wide Ultra-2 SCSI (Small Computer System Interface)
and an 8-bit fast narrow SCSI comes with the system board to
connect SCSI devices.
The system board also supports the USB (Universal Serial Bus)
connector, and other standard features such as two UART NS16C550
serial ports, one enhanced parallel port with Enhanced Parallel Port
(EPP)/Extended Capabilities Port (ECP) feature, a diskette drive
interface, and two embedded hard disk interfaces. The board also
includes a built-in 10/100 Mb/s Intel 82558 LAN chip that supports
Wake-On-LAN (WOL).
The system supports the power-management function that conforms
to the power-saving standards of the U.S. Environmental Protection
Agency (EPA) Energy Star program. It also offers the Plug-and-Play
feature. This feature saves the user from configuration troubles, thus
making the system more user-friendly. The system board supports two
optional features, ASM Pro and Remote Diagnostic
Management (RDM), that allow better server management. The ASM
Pro detects problems in CPU thermal condition, CPU working voltage
detection (±12V/±5V/3.3V/1.5V), and PCI bus utilization calculation. It
also detects if the CPU fan or the chassis fan malfunctions. RDM
allows execution of the RDM diagnostic program from a remote RDM
station to fix detected problems or to reboot the system.
The system is fully compatible with MS-DOS V6.X, Novell Netware,
Novel SFT III, SCO UNIX, Windows NT and Windows 95/98 operating
systems
System Board 1-3
1.2 Major Components
The system board has the following major components:
•Supports dual Intel Pentium II Xeon processors running at 400 or
450 MHz with integrated 512K, 1MB or 2MB L2 write-back cache
•Four DIMM sockets that accept 16-, 32-, 64- 128-, 256 and
512MB DIMMs with a maximum of 2048 MB system memory
•One ISA, six PCI, and one AGP bus slots (one PCI and ISA
shared slot)
•512-KB Flash ROM for system BIOS
•System clock/calendar with battery backup
•One 50-pin fast SCSI and two 68-pin Ultra2 SCSI
•I/O APIC device for SMP interrupt support
•Integrates an enhanced PCI local bus IDE controller
•Intel 440GX chipset supports AGP (Accelerated Graphics Port)
and Ultra DMA/33 functions
•10/100 Mb/s Intel 82558 LAN chip that supports Wake-On-LAN
(WOL)
•Two 24-pin RDM interfaces
•IDE hard disk and diskette drive interfaces
•Auxiliary power connector for 280W SPS and ATX power supply
•Super I/O, SCSI, memory, Advanced Server Management (ASM)
and LAN Desk Client Management (LDCM) controller chipsets
•External ports:
•USB connector •PS/2-compatible keyboard port
•RJ-45 jack •PS/2-compatible mouse port
•Parallel port •Serial port 1 and 2
1-4 User’s Guide
1.3 Layout
Figure 1-1 shows the system board components.
1 Mouse port
2 Keyboard port
3 Serial port 1
4 Parallel port
5 Serial port 2
6 USB connector
7 RJ-45
8 LAN controller
9 AGP slot
10 PCI slots
11 ISA slots
12 Intel 82371EB PIIX4E (PCI-
ISA bridge)
13 DEC 21152 (PCI-PCI bridge)
14 Buzzer
15 SCSI controller
16 Battery
17 Feature Connector (Intel SMM Card)
18 System BIOS
19 RDM connectors
20 Channel A fast/narrow SCSI
connector (50 pin)
21 Channel A Ultra-wide/Ultra-1 SCSI
connector (68 pin)
22 Channel B Ultra-wide/Ultra-1 SCSI
connector (68 pin)
23 Wide SCSI connector (68 pin)
24 EIDE connector 2 (secondary)
25 EIDE connector 1 (primary)
26 DIMM sockets
27 Intel 443GX system controller
28 Power connector 1
29 Power connector 2
30 Power connector
3
31 Slot 2 CPU sockets
Figure 1-1 System Board Layout
1
2
3456
7
8
10
11
13
12
14
15
16
18
19
20
21
22
23
27
31
28
29
30
25
24
26
17
9
System Board 1-5
1.4 Jumpers and Connectors
1.4.1 Jumper and Connector Locations
Figure 1-2 shows the jumper and connector locations on the system
board.
Figure 1-2 System Board Jumper and Connector Locations
Jumpers are prefixed “JP”. Connectors are
prefixed “CN”. The blackened pin of a jumper
or connector represents pin 1.
1-6 User’s Guide
1.4.2 Jumper Settings
Table 1-1 lists the system board jumpers with their corresponding
settings and functions.
Table 1-1 System Board Jumper Settings
Jumper Setting Function
BIOS Logo
JP3 1-2*
2-3 Acer
OEM
Password Security
JP4 1-2
2-3* Check password
Bypass password
Boot Block Mode
JP5 1-2*
2-3 Disabled
Enabled
Sound Output
JP6 1-2*
2-3 Buzzer
Speaker
AlertPack Select
JP7 1-2/4-5
2-3/5-6* AlertPack and LM80
LM80 Only
SCSI CH. B Terminator
JP11 1-2*
2-3 Enabled
Disabled
*Default
System Board 1-7
1.4.3 Connector Functions
Table 1-2 lists the different connectors on the system board and their
respective functions.
Table 1-2 Connector Functions
Connector Function
CN1 Cabinet Fan Connector
CN3 Mouse and Keyboard Ports
CN4 280W Power Supply Connector-1
CN5 280W Power Supply Connector-2
CN6 ATX Power Connector
CN7 280W Power Supply Connector-3
CN9 Modem Card Ring-in Connector
CN10 Parallel (above), Serial 1(left), and Serial 2 (right)
ports
CN11 USB Connectors
CN12 CPU1 Fan Connector
CN13 CPU2 Fan Connector
CN14 RJ-45 (LAN) Port
CN15 Fail Report LED Connector
CN16 Cabinet Fan Connector
CN17 Cabinet Fan Connector
CN18 Cabinet Fan Connector
CN20 2 Color Power LED Connector
CN22 Redundant Power Status Connector
CN23 CPU1 Temperature Connector
CN24 CPU2 Temperature Connector
CN26 PCI Sound Card Interrupt and DMA Request
Connector
CN27 Primary IDE Connector
CN28 FDD Connector
CN29 SCSI Channel B Connector
CN30 Secondary IDE Connector
1-8 User’s Guide
Table 1-2 Connector Functions
Connector Function
CN32 SCSI Channel A Wide Connector
CN33 SCSI Channel A Narrow Connector
CN34 RDM LED Connector
CN35 External Speaker Connector
CN36 Hard Disk LED Connector
CN37 Hard Disk LED Connector
CN38 Power Switch Connector
CN39/47 RDM/ASM Module Connector
CN40 Wake-on-LAN (WOL) Connector
CN42 3-pin Standard Power Connector
CN43 Hard Disk LED Connector
CN44 Reset Button Connector
CN45 Feature Connector (Intel SMM Card)
CN46 Door Switch Connector
System Board 1-9
1.5 ESD Precautions
Always observe the following electrostatic discharge (ESD)
precautions before installing a system component:
1. Do not remove a component from its antistatic packaging until
you are ready to install it.
2. Wear a wrist grounding strap before handling electronic
components. Wrist grounding straps are available at most
electronic component stores.
Do not attempt the procedures described in
the following sections unless you are a
qualified technician.
1-10 User’s Guide
1.6 Installing and Removing the Pentium II
Xeon Processor
Intel’s Pentium II Xeon CPU is a Slot 2 processor that uses uses a
330-pin single edge connector which is a bit longer that a Slot 1
processor. Other than the size the major improvement of the Slot 2
processor is at the L2 cache. Pentium II Xeon processors access the
L2 cache at full clock speed, 400 MHz or 450 MHz, whereas a Slot 1
processor access the L2 at only half the CPU’s clock speed. This
significantly boost performance and speed.
1.6.1 Installing the Retention Mechanism
Follow these steps to install the retention mechanism:
1. Attach both the retention mechanism with the joint bar. Snap-in
the joint bar on both sides of the retention mechanism.
Figure 1-3 Inserting the joint bar on the Retention Mechanism
2. Insert both the retention mechanism into the Slot 2 sockets. Make
sure that the shafts of the retention mechanism with a O sign is
facing the external ports of the system board.
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