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Acer V55LA-2 Motherboard

Jumper and Connector Layout

V55LA-2 Motherboard Diagram

Note - The blackened pin of a jumper represents pin 1.

Specification

The V55LA system has the following features -

  • ZIF socket 7 for an Intel Pentium 75/90/100/120/133/150/166/200MHz including MMX. Also support for Cyrix M1/M2 and AMD K5/K6 CPUs.
  • Four 72-pin SIMM sockets that support 4/8/16/32-MB 60/70ns fast page mode or EDO SIMMS.
  • 256K pipeline-burst second level cache onboard which is not upgradeable.
  • 1-MB video memory plus upgrade sockets for a further 1-MB (some systems shipped with the 1-MB upgrade fitted). The chips needed for the upgrade are - 2 of 514260ASL 256Kb x 16 70ns SOJ.
  • 128K BIOS which is APM and Year 2000 compliant.
  • Two Enhanced IDE interfaces supporting a total of four devices including hard drives and CDROMs.
  • External ports.
    • PS/2 keyboard and mouse ports.
    • Two high-speed (NS16C550 compatible) serial ports.
    • One ECP/EPP high-speed parallel port.
    • VGA port.
  • Onboard chipsets.
    • Aladdin III system chipset (equivalent to Intel Triton II).
    • ATI Mach64 VT or GT (Rage II) PCI graphics adapter.
    • ALI 1523B E-IDE and I/O controller
  • Plug and Play support.
  • Power management features (device standby, global standby).
  • USB support.

CPU Jumper Settings

 SW2 Settings
CPU Freq,1234
Intel Pentium
75 MHzONONOFFOFF
90 MHzONOFFOFFOFF
100 MHzOFFONOFFOFF
120 MHzONOFFONOFF
133 MHzOFFONONOFF
150 MHzONOFFONON
166 MHzOFFONONON
200MHzOFFONOFFON
NBSet JP43 and JP44 2-3. For P54C set JP7 Closed, for P55C (MMX) set JP7 Open
Cyrix/IBM M1
Cyrix/IBM P120+ONONONOFF
Cyrix/IBM P150+ONOFFONOFF
Cyrix/IBM P166+OFFONONOFF
NB Set JP43 and JP44 2-3. For 6x86 set JP7 Closed, for 6x86L set JP7 Open
Cyrix M2
Cyrix M2 PR166OFFONONON
Cyrix M2 PR180ONOFFOFFON
Cyrix M2 PR200OFFONOFFON
NB Set JP43 and P44 2-3, JP7 Open
AMD K5
PR75ONONOFFOFF
PR90ONOFFOFFOFF
PR100OFFONOFFOFF
PR120ONOFFONOFF
PR133OFFONONOFF
PR166OFFONONON
NBSet JP43 1-2, JP44 2-3, JP7 Closed
AMD K6
PR166OFFONONON
PR200OFFONOFFON
PR233OFFONOFFOFF
NBSet JP43 2-3, JP44 1-2, JP7 Open

SW2 Settings

SwitchSettingFunction
Sound Feature
Switch 5
ON
OFF
Onboard sound chip disabled
Onboard sound chip enabled
Password Security
Switch 6
ON
OFF
Password bypass
Password check

Jumper Settings

JumperSettingFunction
JP1 BIOS Type1-2
2-3
For models with Acer BIOS
For models with OEM BIOS
JP2 LED Function1-2
2-3
LED for IDE and FDD
LED for IDE only
JP3, JP4 Second-level Cache 1-2, 1-2
1-2, 2-3
2-3, 2-3
256 KB
512 KB
1 MB
JP7 RegulatorClosed
Open
For CPUs using one voltage (P54C)
For CPUs using two voltages (P55C)
JP11 SMM/Reset Switch1-2
2-3
3-4
Supports SMM switch
Supports reset switch
Funct as additional reset switch conn
JP16 Software Shutdown1-2
2-3
UPS enabled
UPS disabled
CPU Voltage
JP43 (for I/O)

JP44 (for core)

1-2
2-3

1-2
2-3

3.5V
3.3V

2.5V
2.8V

Connector Functions

ConnectorFunction
CN3Power connector
CN5USB Connector
CN7PS/2 keyboard connector
CN8PS/2 mouse connector
CN10Diskette drive connector
CN11IDE connector 2
CN12IDE connector 1
CN13Serial port 1
CN14Serial port 2
CN17Parallel port
CN18CPU fan connector
CN21Video port
CN23ATI multimedia connector (AMC)
CN30Reset switch connector (pins 1-2)
JP10Hard disk and diskette drive LED connector
JP14Power-on switch connector (pins 1-2)
JP15Standby power connector
JP30External battery connector

The multifunction connector CN19 accommodates the front panel connectors for speaker, LEDs, keylock, reset, and turbo. Figure below shows the pin assignments for each connector.
 
Multi Function Connector

Memory

Memory Module : 72pin EDO 60 or 70ns Maximum : 128MB


Video RAM Upgrade

Video Memory can be upgraded from 1MB to 2MB, by inserting 2 of 514260ASL 256Kb x 16 70ns SOJ in sockets U3, U4