Acer V55LA-N2 Motherboard
Jumper and Connector Layout
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. | 1 | 2 | 3 | 4 |
|---|---|---|---|---|
| Intel 75 MHz | ON | ON | OFF | OFF |
| Intel 90 MHz | ON | OFF | OFF | OFF |
| Intel 100 MHz | OFF | ON | OFF | OFF |
| Intel 120 MHz | ON | OFF | ON | OFF |
| Intel 133 MHz | OFF | ON | ON | OFF |
| Intel 150 MHz | ON | OFF | ON | ON |
| Intel 166 MHz | OFF | ON | ON | ON |
| Intel 200MHz | OFF | ON | OFF | ON |
| Cyrix/IBM 6x86 P120+ | ON | ON | ON | OFF |
| Cyrix/IBM 6x86 P150+ | ON | OFF | ON | OFF |
| Cyrix/IBM 6x86 P166+ | OFF | ON | ON | OFF |
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.
| Switch | Setting | Function |
|---|---|---|
| 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
| Jumper | Setting | Function |
|---|---|---|
| JP1 BIOS Type | 1-2 | 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 Regulator | Closed 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 Shutdown | 1-2 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
| Connector | Function |
|---|---|
| CN3 | Power connector |
| CN7 | PS/2 keyboard connector |
| CN8 | PS/2 mouse connector |
| CN10 | Diskette drive connector |
| CN11 | IDE connector 2 |
| CN12 | IDE connector 1 |
| CN13 | Serial port 1 |
| CN14 | Serial port 2 |
| CN17 | Parallel port |
| CN18 | CPU fan connector |
| CN19 | Multifunction connector |
| CN21 | Video port |
| CN23 | ATI multimedia connector (AMC) |
| JP15 | Standby power connector |
| JP30 | External battery connector |
| JP48 | Hard disk and message LED (pins 1-3-5) Power LED (pins 2-4-6) |
| JP50 | Power-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.
Adding RAM is the most cost effective way to boost your computer's performance.
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.