Acer V35LA-N User manual

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System Board
System Board 1-1
The V35LA-N is an all-in-one Pentium-based system board that
features the common functions offered by a high-performance board,
as well as the multimedia functions. It has a power-management
function that conforms to the power-saving standards of the U.S,
Environmental Protection Agency (EPA) Energy Star program. It also
supports the Plug-and-Play feature.
The board utilizes a Pentium processor running at 75/50, 90/60,
100/66, 120/60, 133/66, 150/60, 166/66, or 200/66 MHz. It has one
riser card slot for future expansion. It also has four 72-pin SIMM
sockets that allow memory upgrade to a maximum of 128 MB, and
supports 256-KB/512-KB pipelined-burst second-level cache. The
onboard video controller, MPEG decoder, and audio controller enable
the system to offer both video and audio functions.
Standard features such as two serial ports, one parallel port, a diskette
drive interface, and an embedded hard disk interface are also
incorporated in the system board. A Universal Serial Bus (USB)
interface, video and audio connectors are added to the design to
enable the system to support additional peripherals.
The system is fully compatible with MS-DOS V6.X, OS/2, UNIX,
Windows NT and Windows 95 operating systems.

1-2 User’s Guide
1.1 System Board Layout
The system board has the following features and components:
•Supports 3.3V Intel Pentium CPU (75/50, 90/60, 100/66, 120/60,
133/66, 150/60, 166/66 MHz, 200/66 MHz)
•128-MB maximum system memory
•Four 72-pin SIMM sockets that accept 4-, 8-, 16-, and 32-MB
SIMMs, with or without Extended Data Output (EDO) and Error
Checking and Correction (ECC) functions
•256-KB or 512-KB pipelined-burst second-level cache
•Integrates an enhanced PCI local bus IDE controller
•Onboard video and graphics controller and 1-MB VGA memory,
upgradable to 2 MB
•Audio controller compatible with Sound Blaster, Microsoft Sound,
and MPU-401
•128-KB Flash ROM for system BIOS
•One riser card slot
•Dual 16C550 buffered serial ports and one ECP/EPP parallel port
•USB interface that enables the system to support more
peripherals (optional)
•Standard connector for Wavetable upgrade (optional)
•PS/2 mouse and keyboard interface
•Plug-and-Play function
•Power-management function
•Infrared function for cableless communication (optional)
•Software shutdown circuitry (optional)
Figure 1-1 shows the board layout and the locations of the important
components.

System Board 1-3
1 PS/2 keyboard connector 14 Riser card slot
2 LSFM connector (optional) 15 PCI MPEG video decoder
3 BIOS 16 ASIC (PIIX3)
4 Ultra I/O controller 17 Video and graphics controller
5 Power connector 18 First 1-MB video DRAMs
6 Battery 19 Second 1-MB video DRAM sockets
7 Buzzer 20 VGA connector
8 Second-level pipelined-burst 21 Parallel port
cache
9 CPU socket 22 COM2 port
10 Voltage regulator with heatsink 23 COM1 port
11 SIMM sockets 24 PS/2 mouse connector
12 Voltage regulator with heatsink 25 Audio controller
13 ASIC (TXC)
Figure 1-1 System Board Layout
The heatsink becomes very hot when the
system is on. NEVER touch the heatsink with
any metal or with your hands.
2 3
45 6 7 910
1112
20
21
22
23
24
1
14
15
16
17
25
8
18
19
13

1-4 User’s Guide
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 remove a component from its protective packaging until
you are ready to install it.
2. Wear a wrist grounding strap and attach it to a metal part of the
system unit before handling components. If a wrist strap is not
available, maintain contact with the system unit throughout any
procedure requiring ESD protection.
1.3 Pre-installation Instructions
Always observe the following before you install a system component:
1. Turn off the system power and all the peripherals connected to
the unit before opening it.
2. Open the system according to the instructions in the housing
installation manual.
3. Follow the ESD precautions in section 1.2 before handling a
system component.
4. Remove any expansion boards or peripherals that block 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 the procedures described in
the following sections unless you are a
qualified service technician.

System Board 1-5
1.4 Installing a CPU
1.4.1 Installation Procedures
Observe the ESD precautions when installing
components. See section 1.2.
The system board features a zero-insertion force (ZIF) socket for easy
CPU installation.
Follow these steps to install a CPU:
1. Pull up the socket lever.
2. Insert the CPU, making sure that pin 1 (indicated by a notched
corner) of the CPU connects to hole 1 of the socket.
3. Pull down the socket lever to lock the CPU into the socket.
Step 1
Hole for Pin 1
Step 2
Step 3
Figure 1-2 Installing a CPU
Notched corner

1-6 User’s Guide
1.4.2 Installing an OverDriveCPU
The OverDrive CPU comes with a heatsink already mounted. To
maintain proper airflow around the CPU and heatsink, follow the
required clearances in Table 1-1.
Table 1-1 Clearances for OverDrive CPU and Heatsink
Location Minimum Clearance
Above the heatsink 0.4 inches
Sides of the CPU (at least 3 of 4) 0.2 inches
Follow these steps to install an OverDrive CPU:
1. Locate the CPU socket and pull up the socket lever.
2. Remove the old CPU carefully from the socket and place it in an
antistatic package.
3. Take the upgrade CPU out of its antistatic package.
4. Carefully insert the CPU into the socket such that pin 1 (indicated
by a notched corner) of the CPU connects to hole 1 of the socket.
Figure 1-3 Installing an OverDrive CPU
5. Push down the socket lever to lock the CPU into the socket.
Notched Corner

System Board 1-7
See section 1.11 for the post-installation
instructions.
1.5 Jumpers and Connectors
Figure 1-4 shows the jumper and connector locations.
Figure 1-4 Jumper and Connector Locations
The shaded pin indicates pin 1.

1-8 User’s Guide
The following tables list the jumper settings and their corresponding
functions:
Table 1-2 System Board Jumper Settings
Jumper Setting Function
JP2 1-2 *
2-3
For BIOS ROM 28F001
Enable Boot Block Programming
Normal operation
JP3 1-2
2-3
OPEN *
Flash ROM (28F001)
EPROM
Block Flash EEPROM
JP6 1-2
2-3 * Enable Acer BIOS logo Enable OEM BIOS logo
JP7 1-2 *
2-3 Enable MPEG function Disable MPEG function
JP8, JP9 1-2 *
2-3 Intel (1+4) burst sequence Linear burst sequence
JP11 1-2 *
2-3 Enable SMM switch Enable Reset switch
JP13 SHORT
OPEN Assign one regulator for P54C CPU Assign two regulators for P55C CPU
JP14 1-2 *
2-3 Enable P54C shutdown Set P55C I/O voltage to 3.3V
JP16 1-2
2-3 Enable IDE and FDD LED Enable IDE LED only
JP19 1-2 *
2-3 Enable onboard VGA Disable onboard VGA
*Default setting

System Board 1-9
Table 1-3 CPU Core Voltage Select
JP24 JP25 Vcore
OPEN
2-3 1-2 or 2-3 3.52V 3.3V
OPEN
3-4
1-2, 3-4
3-4 2.9V
2.7V
2.5V
Table 1-4 Bus Frequency Select
SW1
1 2 Bus Frequency
ON ON 50 MHz
ON OFF 60 MHz
OFF ON 66 MHz
Table 1-5 CPU Core/Clock Ratio Select
SW1
3 4 P54C M1 K5
ON ON 5/2 1/1
OFF OFF 3/2 3/1 3/2
ON OFF 2/1 2/1 1/1
OFF ON 3/1 4/1
Table 1-6 SB
1
/Password Function Select
SW1
5 6 Setting
Disable SB Bypass password ON
1Sound Blaster

1-10 User’s Guide
Enable SB Check password OFF