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Acer V55LA-N2 Motherboard

Jumper and Connector Layout

v55ii 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
  • 256/512-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 M1521, ALI M1523)
    • PCI local bus VGA with enhanced GUI acceleration (ATI 264VT / ATI 264GT RAGE II+)
    • Internal IDE (ALI 1523B)
    • System and PCI clock generator (Cypress 2254)
  • Plug-and-Play feature (PnP)
  • Power management features (device standby, global standby, and suspend modes)
  • Software Shutdown feature "Appears Off" (for Windows 95) is now integrated on the motherboard. A Software Shutdown power supply is required to use this feature. (Not all V55LA-N-II systems shipped with a Software Shutdown power supply).

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
Cyrix/IBM 6x86 P166+OFFONONOFF

Notes -

  • For non-MMX Intel processors and Cyrix M1 (6X66) processors, set JP7 Closed, JP43 to 2-3, and JP44 to 2-3.
  • For MMX Intel processors and Cyrix M1 (6X66L) 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 Type1-2
For models with Acer BIOS
For models with OEM BIOS
JP2 LED Function 1-2
2-3		LED for IDE and FDD
LED for IDE only
JP3, JP4 Second-level Cache 1-2, 1-2
2-3, 2-3		256 KB
512 KB
JP7 RegulatorClosed
Open		For single-voltage CPUs (P54C, K5, M1)
For dual-voltage CPUs (P55C, K6)
JP11 SMM/Reset Switch 1-2
2-3		Supports SMM switch
Reserved
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
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
CN19Multifunction connector
CN21Video port
CN23ATI multimedia connector (AMC)
JP15Standby power connector
JP30External battery connector
JP48Hard disk and message LED (pins 1-3-5) Power LED (pins 2-4-6)
JP50Power-on switch 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 system ships with either 256k (Personal Solution Systems) or 512k (Ultimate Multimedia Systems) Pipeline Burst Cache soldered to the motherboard and is not upgradeable.