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Acer V55LA-N Motherboard

Jumper and Connector Layout

v55cln board diagram

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

Specification

The V55LA-N system has the following features -

  • A zero-insertion force (ZIF) socket for an Intel Pentium 75/90/100/120/133/150/166/200 MHz
  • Two DRAM banks composed of four 72-pin SIMM sockets that support 4/8/16/32-MB 60-/70ns fast-page or EDO-type SIMMs
  • 256-KB write-back synchronous pipeline-burst second-level cache onboard
  • 128-KB APM-compliant system and VGA BIOS
  • Two PCI-enhanced IDE interfaces that support up to four IDE devices in PIO mode 4 and DMA mode 2
  • System clock/calendar with 128 bytes CMOS RAM
  • Standard 1-MB video DRAM onboard plus two upgrade sockets for up to 2-MB video memory
  • 188-pin connector for PCI/ISA slot board
  • External ports:
    • PS/2 keyboard and mouse ports
    • Two buffered high-speed serial ports (NS16C550-compatible UARTs with 16-byte FIFOs
    • One ECP/EPP high-speed parallel port (IEEE 1284-compliant)
    • Video port
  • Onboard controller chipsets
    • System chipsets (ALI M1511, ALI M1512, ALI M1513)
    • PCI local bus VGA with enhanced GUI acceleration (ATI 264VT) or (ATI 264GT)
    • PCI-enhanced local bus IDE (CMD 0646)
    • Ultra I/O (SMC 93X)
    • System and PCI clock generator (Cypress 2257)
  • Plug-and-Play feature (PnP)
  • Power management features (device standby, global standby, and suspend modes)
  • Software shutdown feature (for Windows 95) optional

CPU Jumper Settings

SW2 Settings

CPU Freq.1234
Intel 75 MHzONONOFFOFF
Intel 90 MHzONOFFOFFOFF
Intel 100 MHzOFFONOFFOFF
Intel 120 MHzONOFFONOFF
Intel 133 MHzOFFONONOFF
Intel 150 MHzONOFFONON
Intel 166 MHzOFFONONON
Intel 200MHzOFFONOFFON
Cyrix/IBM 6x86 P120+ONONONOFF
Cyrix/IBM 6x86 P150+ONOFFONOFF

Notes -

  • For non-MMX Intel processors and Cyrix M1 processors, set JP7 Closed, JP43 to 2-3, and JP44 to 2-3.
  • For MMX Intel processors, set JP7 Open, JP43 to 2-3, and JP44 to 2-3.


SwitchSettingFunction
CPU Clock Frequency
Switches 1, 2 		ON, ON
ON, OFF
OFF, ON		75/50 MHz
90/60, 120/60, 150/60 MHz
100/66, 133/66, 166/66, 200/66 MHz
CPU Frequency Ratio
Switches 3, 4

ON, ON
OFF, OFF
ON, OFF
OFF, ON 		Intel  M1  K5

 5/2  1/1   2/1
 3/2  3/1   3/2
 2/1  2/1     -
 3/1  4/1     -
Switch 5 ON
OFF		 Reserved
Reserved
Password Security Switch 6 ON
OFF		 Password bypass
Password check

Jumper Settings

JumperSettingFunction
JP1 BIOS Type1-2For models with Acer BIOS
JP2 LED Function 1-2
2-3		LED for IDE and FDD
Reserved
JP3, JP4 Second-level Cache 1-2, 1-2256 KB
JP5 Flash BIOS fn (Intel 28F001 only)1-2
2-3		 Allows boot block programming
Normal operation
JP6 BIOS ROM Type
1-2
2-3
Open		Flash ROM (28F010)
EPROM
Block Flash EEPROM (SST 29EE010)
JP7 RegulatorClosed
Open		For CPUs using one voltage (P54C)
For CPUs using two voltages (P55C)
JP11 SMM/Reset Switch 1-2
2-3
3-4		Supports SMM switch
Supports reset switch
Reserved
JP16 Software Shutdown1-2
2-3		 UPS enabled
UPS disabled
JP42 L2 Cache Mode1-2
2-3		Intel Pentium CPU
IBM/Cyrix 6x86 (M1)
CPU Voltage
JP43 (for I/O)
JP44 (for core)
1-2
2-31-2
2-3
3.5V
3.3V 2.5V
2.8V

Connector Functions

ConnectorFunction
CN3Power 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)
JP9Hard disk and power LED connector (Fujitsu)
JP10Hard disk and diskette drive LED connector
JP11SMM switch/reset switch
JP14Power-on switch connector (pins 1-2)
JP15Standby power connector
JP30External battery connector

Memory

The system board comes with four 72-pin SIMM sockets that support 4-MB and 16-MB single-density 60/70ns SIMMs and 8-MB and 32-MB double-density 60/70ns SIMMs. These systems ship with either Extended Data Output (EDO) or Fast Page Mode (FPM) 60/70ns memory. DO NOT MIX FPM and EDO SIMMS. Maximum is 128MB.


Video RAM Upgrade

Aspire Personal Solutions and SOHO systems ship with 1 MB EDO memory onboard and are upgradeable to 2 MB EDO. Aspire Ultimate systems are standard with the maximum 2 MB EDO memory. Order the video upgrade kit from Acer Access P/N 91.AA994.001.

Cache Upgrade

The V55LA-N ships with 256KB Pipeline Burst Cache and is not upgradeable.