Page 1
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USER’S MANUAL
A48 MAIN BOARD
Page 2
482A4801
Printed in Taiwan 2000
- -
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Page 3
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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
Page 4
1. Jumpers Location Diagram for "A48" V2.X M/B
LAN1
JP21
4
JP20
U27
SMC
MC16651R
1
DALLAS
U22
GD5446
PS2
2 10
1
U24
KEY BD.
J15
9
U26
JP23
JP22
1
3
U23
LAN
COM1
2 6
JP2
1
5
4
1
COM2
1
J4
62
51
JP2
U4
626512
8
51
JP24
J6 J7 J10
M1523
JP10
SLOT 1
U3
2
1
JP8
5
JP1
1
6
JP13
J9
PRINT
HDD DATA CABLE CONN.
FDD CABLE CONN.
J8
1
JP17
VGA
U17
6 5
JP19
JP18
1
3
U16
3
CY2254ASC
12
2
4
U15
SLOT2
JP7
CPU
SRAM32KX32
U14
JP6
JP5
J3
4
1
J241
72-PIN SIMM RAM SOCKET-SIMM
72-PIN SIMM RAM SOCKET-SIMM
72-PIN SIMM RAM SOCKET-SIMM
72-PIN SIMM RAM SOCKET-SIMM
1
4
LED
J1
1
U6
M1521
LED
16 6
1
2
3
4
2 10
JP3
SRAM32KX32
JP16
3
1
JP15
3
1
JP14
U18
U19 U20 U21
91
1
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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
2
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3. Jumper settings
CPU selection: JP18 , JP5 , JP6 , JP8
CPU JP18 JP5 JP6 JP8
Intel Pentium 75
Intel Pentium 90
Intel Pentium 100
Intel Pentium 120
Intel Pentium 133
Intel Pentium 150
Intel Pentium 166
Intel Pentium 200
AMD 5k86-P75
AMD 5k86-P90
AMD 5k86-P100
AMD 5k86-P133
1-2 , 3-4 off off 1-2 , 3-4
1-2 off off 1-2 , 3-4
3-4 off off 1-2 , 3-4
1-2 off on 1-2 , 3-4
3-4 off on 1-2 , 3-4
1-2 , 3-4 on off 1-2 , 3-4
3-4 on on 1-2 , 3-4
3-4 on off 1-2 , 3-4
1-2 , 3-4 off off 1-2 , 3-4
1-2 off off 1-2 , 3-4
3-4 off off 1-2 , 3-4
3-4 off on 1-2 , 3-4
Cache RAM size selection: JP14
Cache RAM size JP14
256KB (32Kb*32)
512KB (64Kb*32)
2-3
1-2
Keyboard Controller selection: JP10
K/B Controller JP10
Built-in core logic
IC 8042
on
off
Reserved: JP3, JP4, JP7, JP15, JP17, JP22
3
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Real Time Clock Controller selection: JP9
RTC Controller JP9
Dallas 12887
Built-in core logic
Clean CMOS data (Dallas 12887 only): JP20
RTC Controller JP20
Normal operation
Clean CMOS data
ROM BIOS type selection: JP1
ROM BIOS type JP1
+5V EPROM or Flash ROM
+12V Flash ROM
DMA channel selection for ECP mode of Parallel Port: JP19
DMA channel JP19
DMA 3
DMA 1
off
on
off
on
2-3
1-2
1-3 , 2-4
3-5 , 4-6
The Pin 1 assignment of the connector of COM1: JP2
Pin 1 signal JP2
*DCD1
+5Vdc
+12Vdc
The Pin 2 assignment of the connector of COM2: JP13
Pin 1 signal JP13
*DCD2
+5Vdc
+12Vdc
1-2
3-4
5-6
1-2
3-4
5-6
4
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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
5
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