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Acer V50LA-N Motherboard

Jumper and Connector Layout

V50LAN Motherboard Diagram

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

  • CPU Socket: ZIF Socket 7
  • CPU Types:
    • Intel Pentium 75
    • Intel Pentium 90
    • Intel Pentium 100
    • Intel Pentium 120
    • Intel Pentium 133
    • Intel Pentium 150
    • Intel Pentium 166
  • Clockspeeds:
    • 50 MHz (Pentium 75 MHz)
    • 60 MHz (Pentium 90/120/150 MHz)
    • 66 MHz (Pentium 100/133/166 MHz)
  • On-Board Memory:
    • 0 MB RAM
    • 0 KB or 256 KB Cache
    • 1 MB Video DRAM (Upgradeable to 2 MB)
  • On-Board Video: ATI Mach64(CT)
  • BIOS Type: Flash
  • Bus Type: ISA/PCI
  • On-Board Controller: SMC
  • Chipset: ALI
  • I/O Ports:
    • 2 9-pin Serial
    • 1 25-pin Parallel (ECP/EPP)
  • Cases: Jetson Desktop or Jetson Mini-Tower

More Information

  • Cache Upgrade
    • Cache Sockets: 9
    • Supported Sizes: 256KB
    • Cache Type: Asynchronous
    • The cache sockets are located at U40, U41, U43, U44, U45, U47, U50, U51, and U36.
    • Ensure that jumpers JP7 & JP8 are set to 1-2 for 256KB.
  • Memory Upgrade
    • SIMM Sockets: 4 x 72-pin Sockets - 2 Banks
    • Maximum RAM: 128 MB
    • SIMM Type: 72-pin 70ns Non-Parity
  • Video Upgrade
    • Video DRAM Sockets: 2 (U5, U6)
    • Supported Sizes: 1 MB (onboard), (upgradeable to 2 MB)
    • Video DRAM Type: 256 KB x 16 70ns
    • Upgrade using 2 of 514260ASL 256Kb x 16 70ns SOJ inserted into sockets U3 & U4.

CPU configurations

CPU TypeJP6JP9JP10JP 11
Intel P751-41-21-21-2
Intel P902-51-21-21-2
Intel P1003-61-21-21-2
Intel P1202-51-21-22-3
Intel P1333-61-21-22-3
Intel P1502-51-22-32-3
Intel P1663-61-22-32-3
Cyrix P120+1-42-31-22-3
Cyrix P150+2-52-31-22-3

N.B. Cyrix/IBM CPU names suggest their performance compared to Intel Pentiums and are higher than their clock speeds.

Jumper Settings

JumperSettingFunction
JP2
BIOS Type
1-2
2-3*
For models with Acer BIOS
For models with OEM BIOS
JP3
Password Check
1-2
2-3*
Check password
Bypass password
JP4
Boot Block Feature **
1-2
2-3*
Enable Flash ROM boot block feature
Disable Flash ROM boot block Feature
JP5
BIOS ROM Type
1-2
2-3
3-4*
Reserved
Flash ROM (Intel 28F001)Flash ROM (SST, Winbond 29EE010)
JP6
CPU Core/Host Bus Frequency
1-4
2-5*
3-6
75/50 MHz
90/60, 120/60, 150/60 MHz
100/66, 133/66, 167/66 MHz
JP7,JP8
Second-level Cache
1-2*,1-2*
1-2, 2-3
2-3, 2-3
256 KB
512 KB
1 MB
JP9
CPU Type
1-2*
2-3
Intel P54C or AMD K5
Cyrix M1
JP10,JP11
CPU / Clock Ratio
1-2,1-2*
1-2, 2-3
2-3, 1-2
2-3, 2-3
Intel P54CM1 and K5
3/2 3/1
2/1 2/1
3/1
5/2
JP12
CPU Voltage
1-2*
2-3
3.38V for VR and standard CPU type
3.52V for VRE CPU type

** The boot block feature works only with Intel 28F001 Flash ROM and requires JP5 to be set to pins 2-3.
*Default setting.

Connector Functions

ConnectorFunction
CN2ATI media connector
264 CT (26-pin VFC 5V)
264 VT (40-pin AMC 3.3V)
Note: 264 CT and 264 VT are not interchangeable
because they have different supply voltages.
CN8IDE channel 1
CN9IDE channel 2
CN10Diskette drive connector
CN11Power connector
CN12Reserved
CN16SMM switch/Reset switch
1-2* For SMM switch
2-3 For reset switch
3-4 Reserved
CN17Multifunction connector
CN20Hard disk drive LED connector

The multifunction connector CN17 accommodates the front panel connectors for speaker, LEDs, keylock, reset, and turbo. Figure 1-3 shows the CN17 pin assignments for each of the front panel connectors.

Multi Function Connector

BIOS

Entering the BIOS

Pressing CTRL-ALT-ESC during the boot process is the only way to enter the BIOS. Pressing the sequence at the MS-DOS prompt will do nothing.

  • Turn on the system and wait until a beep is heard.
  • Press CTRL-ALT-ESC to enter the BIOS.

Viewing the BIOS Revision and Memory Count

To review the BIOS Revision and memory count without having to disable Quiet Boot, follow the steps below.

  • Turn on the system and wait until a beep is heard.
  • Press F9 and the normal post screen will appear.

There are two new features found in Basic System Configuration page two.

  • Quiet Boot
    • Default is enabled, only a flashing Acer Logo screen will appear until Windows 95 starts to load. When this is disabled, the system will display the normal BIOS revision and memory count during the boot process.
  • Configuration Table
    • Default is disabled, toggling this option will allow one to view the blue post screen: CPU, hard drives, floppy drives, memory, serial ports, parallel ports, and pointing device status are displayed here.