 Acer File Extensions |
Acer V12LC Motherboard
Jumper and Connector Layout
Note - The blackened pin of a jumper represents pin 1.
The system board has the following major features:
- Pentium 75/90/100 MHz CPU in a zero-insertion force (ZIF) socket.
- Two DRAM banks composed of four 72-pin SIMM sockets that support 4/8/16/32-MB 60/70ns SIMMs
- 16-KB internal cache and 256-KB write-back second-level cache.
- 128-KB Flash ROM for system and VGA BIOS.
- Two PCI enhanced IDE interfaces that support up to four IDE devices.
- System clock/calendar with 128 bytes CMOS RAM.
- Cirrus 5430/5434 VGA PCI accelerator that supports up to 2-MB video memory for a resolution up to 1024x768, 256 colors non-interlaced.
Pentium chip configurations
| CPU Speed | JP8 | JP14 |
|---|---|---|
| P75 | 1-4 | 1-2 |
| P90 | 2-5 | 1-2 |
| P100 | 3-6 | 1-2 |
| P120 | 2-5 | 2-3 |
| P133 | 3-6 | 2-3 |
Jumper Settings
| Jumper | Setting | Function |
|---|---|---|
| JP1 | 1-2* 2-3 | For models with Acer BIOS For models with OEM BIOS |
| JP2 | 1-2 2-3* | Check password Bypass password |
| JP3 BIOS ROM | 1-2 2-3* | Flash ROM EPROM BIOS ROM |
| JP4,JP5 Parallel DMA | 1-2 2-3 | DMA1 using DRQ1 and DACK1# DMA3 using DRQ3 and DACK3# |
| JP6 Onboard I/O | 1-2 2-3* | Disable onboard SMC665 Enable onboard SMC665 |
| JP7 Onboard VGA | 1-2 2-3* | Disable onboard GD54xx Enable onboard GD54xx |
| JP8 CPU clock frequency | 1-4 2-5* 36 | 50 MHz clock (Pentium 75 MHz) 60 MHz clock (Pentium 90/120 MHz) 66 MHz (Pentium 100/133 MHz) |
| JP9 Enhanced IDE | 1-2 2-3* | Disabled Enabled |
| JP11 M1451 delay | 1-2 2-3 | No delay Delay ADS# by 1 CPU clock cycle |
| JP12 CPU Type | 1-2* 2-3 | Intel P54C or AMD K5 CPU Cyrix M1 CPU |
| JP13 CPU Voltage | 1-2* 2-3 | 3.3825V for VR and standard CPU type 3.5250V for VRE CPU type |
| JP14, CPU Clock Ratio | 1-2* 2-3 | 3/2 times clock frequency 2/1 times clock frequency |
| JP15 Reset Switch | 1-2 2-3* | For suspend mode function For reset function |
Connector Functions
| Connector | Function |
|---|---|
| CN1 | VGA feature connector |
| CN2 | PCI IDE channel 1 |
| CN3 | PCI IDE channel 2 |
| CN4 | Diskette drive connector |
| CN5 | Power connector |
| CN6 | Multifunction connector |
| CN7 | Multifunction connector |
| CN8 | Hard disk LED connector |
| CN9 | Reserved |
| Multifunction connector CN6This connector accommodates the front panel connectors for speaker, LEDs, keylock, reset, and turbo. Figure 1-3 shows the CN6 pin assignments for each of the front panel connectors. |
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Memory
Memory type : 72 Pin, 70ns, Non-Parity Fast Page Mode SIMMS with gold tips. Maximum : 128MB
Cache
The V12LC ships with 256k write-back second-level cache and is not upgradable.
Video Memory
The V12LC-I ships with the Cirrus 5430/5434 VGA PCI accelerator on-board. It supports up to 2 MB video memory for a resolution up to 1024x768x256, non-interlaced. Large video memory allows you to display higher resolutions and more colors*. The system board comes with 1 MB onboard, upgradable to 2 MB.
*800x600x16 million colors is not available when video memory is upgraded to 2 MB on CL-5430 and CL-5440 chipsets.