Acer ALTOS 700ID User Manual
System Board
The system board is designed with 32-/64-bi t auto-det ect, aut o-switch
architecture. It is a high-peformance board that support s both the 486
series and the new Pentium microprocessors, making the
486/Pentium system a performance machine that will last well into the
future.
It featur es single-chip upgrade technology t hat makes CPU upgrades
easy and economical . It i s full y compati ble with the IBM P C/AT and
is suitable f or use as a multiuser f ile serv er, LAN file server or as a
CAD/CAE/CAM workstation.
The system board supports 128-KB system ROM, five 16-bit ISA
expansion slots, three PCI local bus slots, a CPU board slot, four
72-pin DRAM sockets, two IDE connec tors and one SCSI connector
(for SCS I models). Standard f eatures such as two serial ports, one
parallel port, a diskette driv e interface and an embedded fix ed disk
drive interface also reside on the system board.
The system board supports a m axim um mem ory of 128 MB using 4and 16-MB single-density, 8- and 32-MB (with parity) double-density,
and 2-MB (without parity) SIMMs.
System Board 1-1
1.1 Major Components
The system board has the following major components:
•
Four 72-pin SIMM sockets arranged in t wo banks (labeled
Bank 0 and Bank 1)
•
DRAM controller with page/faster page mode and burst read
capability
•
One CPU board slot
•
Four 16-bit ISA expansion slots supporting master add-on c ar ds
•
Two PCI slots
•
One full-f unc tion ISA/ P CI slot
•
Real-ti me clock with 5-7-year batter y
•
128-KB flash ROM used as system BIOS
•
PS/2 keyboard and mouse interface
•
Reset and front- panel LED interface f or ID3P or IDAB housing
•
Onboard National P C87332 chip that supports one parall el port,
two serial ports, one I DE por t, and one FDD port
•
Onboard AIC-7850 chip t hat supports one 8-bit SCSI- II port (one
port supports seven devices)
•
Enhanced IDE (PCI to IDE) on PCI bus that supports two IDE
ports for four IDE devices
Figure 1-1 shows the system board layout and the locations of the
major c omponents.
1-2 User’s Guide
1 2 3 4 5 6 7
1 2345 6
22
21
22
21
20
19
19
18
18
17
17
16
BANK 1
BANK 020
8
7
8
9
9
10
10
11
11
12
12
13
16 15 14
1COM2
2 Printer port
3 IDE connector
4 FDD connector
5 Power connector
6 CPU board slot
7 SIMM sockets
8 SCSI connector
9 Enhanced IDE1 connector
10 Enhanced IDE2 connector
11 Power LED connector
1
12 HDD LED connector
13 Reset/SMI connector
14 Real-time clock
15 System BIOS (flash ROM)
16 ISA slots
17 Keyboard controller
18 ISA/PCI slot
19 PCI slots
20 PS/2 mouse connector
21 COM1
22 PS/2 keyboard connector
131415
2
Figure 1-1 System Board Layout
1
The connector version varies depending on the system housing. The system may
come w i th either an IDAB or an ID3P housing.
2
You cannot use both slots at the same time.
1
1
System Board 1-3
1.2 ESD Precautions
Electrostatic discharge (ESD) can damage your processor, disk
drives, expansion boards, and other components. Always observe
the following precautions before you install a system component.
1. Do not rem ove a component from i ts protecti ve pack aging until
you are ready to i nstall it .
2. W ear a wrist grounding strap and attach it to a met al part of the
system unit bef ore handling com ponents. If a wrist strap is not
avai lable, mai ntain contact with the system unit throughout any
procedure requiring ESD protect ion.
1.3 Pre-installation Instructions
Always observe the foll owing before you install a system component:
1. Turn of f the system power and all t he peripherals connected to
the unit before opening i t.
2. Open the system according to the instructions in the housing
install ation manual.
3. Follow the ESD precautions in section 1.2 before handling a
system component.
4. Remov e any expansion boards or peri pherals that bl ock access
to the SIMM sockets or CPU socket.
5. See the following sections for specific instructions on the
component you wish to install.
Do not attempt t he procedures described in
the following sections unless you are a
qualified service tec hnic ian.
1-4 User’s Guide
1.4 Upgrading the CPU
The system has a separate board f or the CPU and the second-lev el
cache. The single-chip upgrade t echnol ogy gi v es you t he f l ex ibility to
upgrade the CPU by sim ply i nserting a hi gher 486 CPU or a Pent ium
CPU. Refer to Chapter 2 f or detail ed i nstructi ons on how t o upgrade
the CPU.
1.5 Jumper Settings
You have to change the jumper settings on the system board
whenever you reconfigure t he system.
Follow these steps to change a j umper setting:
1. Shut off the system power.
2. Remove the jumper cap f r om the jumper.
3. Position the jumper cap over the two pins for the desired
function.
4. Gentl y pr ess the cap into place.
Figure 1-2 shows the jum per locations.
System Board 1-5
Figure 1-2 System Board Jumper Locations
Table 1-1 lists the system board jumpers settings and their
corresponding f unc tions.
Table 1-1 System Board Jumper Settings
Jumper Setting Function
JP1
JP2 1-2*
JP3 1-2*
JP4 1-2*
JP6 1-2*
*
2-3
1-2
Open
2-3
2-3
2-3
Disregards password
Enables password
Enables reset function
Disables reset function
BIOS
Reserved
128 bytes or 256 bytes (NVRAM)
4 Kbytes, reserved (NVRAM)
Enables onboard buzzer
Enables external speaker
*
Default setting
1-6 User’s Guide
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