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USER’S MANUAL
A48 MAIN BOARD
- - .
482A4801
Printed in Taiwan 2000
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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.
Table of Contents Page
Technical details
1. Jumpers location diagram for A48 main board 1
2. Memory configuration 2
3. Jumper setting 3 – 5
All other registered and unregistered trademarks are trademarks of their respective
holders
1
1. Jumpers Location Diagram for "A48" V2.X M/B
LAN1
4
1J3
72-PIN SIMM RAM SOCKET-SIMM
72-PIN SIMM RAM SOCKET-SIMM
72-PIN SIMM RAM SOCKET-SIMM
72-PIN SIMM RAM SOCKET-SIMM
LED
1
J1 1
J2 4
1
16 6
4
2
3
1
U18
JP14
U19 U20 U21
PS2
FDD CABLE CONN.
J6 J7 J10
J8
SLOT2
1
M1521
JP5
JP6 U6
JP7
CPU
M1523
SLOT 1
JP1
U3 1
JP8
U4
JP10
JP13
JP15
U14
U15
SRAM32KX32
SRAM32KX32
JP16
13
3
1U22
GD5446
JP20
DALLAS
U24
JP17
1
CY2254ASC
3
JP18
U16
12
41
MC16651R
JP21
JP19
6 5
SMC
U27
J9
4LAN
1
COM1
1
JP2 2 6
5
COM2
J4
PRINT
HDD DATA CABLE CONN.
VGA
U23
13JP22
U26
KEY BD.
J15
1
2 10
9
JP2 51
62
8
1
51
626
51
2
JP24
12
4
3
5
2
6
LED
4
91 JP3
2 10
JP23
U17
2
2. Memory configuration for "A48" V2.X main board
•
System Memory's Configuration.
SIMM 1 Bank 0
SIMM 2
SIMM 3 Bank 1
SIMM 4
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.
U18 U19 U20 U21
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
3
3. 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
4
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
5
USB headers: J2 , J3
Pin # Pin assignment
1Vcc
2USB data
3USB data
4GND
IR header: JP21
Pin # Pin assignment
1IR RX 2
2GND
3IR TX 2
4Vcc
Header for LAN slot: LAN1
Header for FAN: J6 , J7
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