USER’ S MANUAL
A48 MAIN BOARD
482A4801
Printed in Taiwan 2000
A48 Main Board
INDEX
This user’ s manual describes the jumper setting of A48 Main Board. For detailed technical information, please refer to CDs attached with PC system unit.
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Jumpers Location Diagram for “A48” V2.X M/B
Memory configuration for “A48” V2.X main board
- System Memory’s Configuration.
The A48 mother board provides Auto-bank SIMM socket and supports 32-bit SIMM module operation. Install one 72-pin SIMM module in any of the four SIMM sockets will enable system to work.
Remark:
Please refer to above figure for SIMM socket. SIMM 1 and SIMM 2 stand for Bank 0, SIMM 3 and SIMM 4 stand for Bank 1.
Please make sure to install the same memory type at SIMM 1 and SIMM 2 for Bank 0, and same memory type at SIMM 3 and SIMM 4 for Bank 1. The memory won‘ t be recognized if different memory type installed at the same Bank. - VGA Memory’s Configuration.
VGA memory 1MB (EDO) U19 , U20 installed 2MB (EDO) U18 , U19 , U20 , U21 installed
IMPORTANT
The A48 on board PCI VGA ID is set on #31, if a PCI add-on cad to be installed, please set its ID at #1 -#30 to avoid conflict
Jumper settings
CPU selection: JP18 , JP5 , JP6 , JP8
| CPU | JP18 | JP5 | JP6 | JP8 |
| Intel Pentium 75 | 1-2 , 3-4 | off | off | 1-2 , 3-4 |
| Intel Pentium 90 | 1-2 | off | off | 1-2 , 3-4 |
| Intel Pentium 100 | 3-4 | off | off | 1-2 , 3-4 |
| Intel Pentium 120 | 1-2 | off | on | 1-2 , 3-4 |
| Intel Pentium 133 | 3-4 | off | on | 1-2 , 3-4 |
| Intel Pentium 150 | 1-2 , 3-4 | on | off | 1-2 , 3-4 |
| Intel Pentium 166 | 3-4 | on | on | 1-2 , 3-4 |
| Intel Pentium 200 | 3-4 | on | off | 1-2 , 3-4 |
| AMD 5k86-P75 | 1-2 , 3-4 | off | off | 1-2 , 3-4 |
| AMD 5k86-P90 | 1-2 | off | off | 1-2 , 3-4 |
| AMD 5k86-P100 | 3-4 | off | off | 1-2 , 3-4 |
| AMD 5k86-P133 | 3-4 | off | on | 1-2 , 3-4 |
Cache RAM size selection: JP14
| Cache RAM size | JP14 |
| 256KB (32Kb*32) | 2-3 |
| 512KB (64Kb*32) | 1-2 |
Keyboard Controller selection: JP10
| K/B Controller | JP10 |
| Built-in core logic | on |
| IC 8042 | off |
Reserved: JP3, JP4, JP7, JP15, JP17, JP22
Real Time Clock Controller selection: JP9
| RTC Controller | JP9 |
| Dallas 12887 | off |
| Built-in core logic | on |
Clean CMOS data (Dallas 12887 only): JP20
| RTC Controller | JP20 |
| Normal operation | off |
| Clean CMOS data | on |
ROM BIOS type selection: JP1
| ROM BIOS type | JP1 |
| +5V EPROM or Flash ROM | 2-3 |
| +12V Flash ROM | 1-2 |
DMA channel selection for ECP mode of Parallel Port: JP19
| DMA channel | JP19 |
| DMA 3 | 1-3 , 2-4 |
| DMA 1 | 3-5 , 4-6 |
The Pin 1 assignment of the connector of COM1: JP2
| Pin 1 signal | JP2 |
| *DCD1 | 1-2 |
| +5Vdc | 3-4 |
| +12Vdc | 5-6 |
The Pin 2 assignment of the connector of COM2: JP13
| Pin 1 signal | JP13 |
| *DCD2 | 1-2 |
| +5Vdc | 3-4 |
| +12Vdc | 5-6 |
USB headers: J2 , J3
| Pin # | Pin assignment |
| 1 | Vcc |
| 2 | USB data |
| 3 | USB data |
| 4 | GND |
IR header: JP21
| Pin # | Pin assignment |
| 1 | IR RX 2 |
| 2 | GND |
| 3 | IR TX 2 |
| 4 | Vcc |
Header for LAN slot: LAN1
Header for FAN: J6 , J7
