EPOX GXA486SPM User manual

TRADEMARK
All products and company names are
trademarks or registered trademarks of
their respective holders.
GREEN
GXA486SPM
VESA ISA PCI with super multi-I/O

Contents
Chapter 1 - Introduction ................................................ 1-1
Chapter 2 - Hardware Design......................................... 2-1
Motherboard Layout .............................................................2-1
Connectors and Jumpers.......................................................2-2
System Memory configuration ..............................................2-4
Cache Memory configuration ...............................................2-5
Super Multi-I/O Controller...................................................2-6
Integrated PCI Bridge .......................................................... 2-7
Chapter 3 - Award BIOS ................................................ 3-1
Standard CMOS Setup .........................................................3-2
BIOS Features Setup ............................................................3-2
Chipset Features Setup .........................................................3-3
Power Management Setup ....................................................3-4
PCI Configuration Setup ......................................................3-6
Load Setup Defaults .............................................................3-8
Password Setting ..................................................................3-8
IDE HDD Auto Detection and HDD Low Level Format........3-9
Exit Setup Utility..................................................................3-9

Introduction1-1
Chapter 1
Introduction
The 486SPM motherboard is a high performance system hardware
based on 486 processor. It designed with SIS85C496 / 497 VESA/ISA/PCI
Chipset and SMC FDC37C665GT super multi I/O controller. The hard-
ware dimension is 220mm * 250mm with four layer design technology.
The 486SPM dectects CPU working voltage automaticlly, and its jumper
setting for CPU Selection is very easy.
Specification
•INTEL 80486SX/DX/DX2/DX4/P24D/P24T/SL-Enhanced,
AMD Am486DX/DX2/DX4/SL-Enhanced,
Cyrix M7(Cx486DX/DX2/DX4)/M1SC(Cx5x86),
UMC U5 Processor with 237 pins ZIF socket.
•Supports up to 256 MegaBytes DRAM on board(72 Pins SIMM x 4), and
"Table-Free" DRAM configuration.(Refer to Chapter 2-3 System Memory
Configuration)
•Supports Secondary level Write Through and Write Back Cache mode.
The cache memory combination could be 128KB/256KB/512KB/1MB
(32KB*8, 64KB*8, or 128KB*8 DIP SRAM respectively).
• Support four 16 bits ISA slots, three 32 bits PCI slots, one VL-bus
slot(slave), and dual ports Enhanced IDE connector.
The 486SPM built-in SMC FDC37C665 Super multi-I/O Controller. It
support 1 floppy port (up to 2.88MB), 1 parallel port (EPP,ECP port )
and 2 serial ports (16550 fast UART compatible).
•Support Award BIOS . The BIOS is stored either in ROM or in Flash
ROM (optional) form. It provides better upgradeability for the user when
Flash ROM is installed in the system.
•Supports SL-Enhanced CPU SMM (System Management Mode).
•Supports a PS/2 Style mouse and standard AT Style keyboard connector.
•The 486SPM utilizes Lithium battery which provides environmental
protection and longer life time.

1-2 486SPM
486SPM Layout
Power Connector
J3 J4 1J1 J2
BANK 1
U27 U26 U25 U24 U23
V V V V V
BANK 0
J8J6J5 J7 DATA SRAM
Figure 1-1
U20 U19 U18 U17
JP15
1
TAG
1
JP10
Socket3
JP21
1
BAT.
TB-SWSPEAKERKEYLOCK RESET TB-LED G-LED HDD-LEDSLEEP
JPS3
1
JP14
JP16
JP8
JP7
JPS1
JPS2
JP5
K/B
CONN.
SIS
V V V V
85C497
S5 S6 S7
JP2
SMC
37C665
JP20
PRIMARY (IDE1)
MX8325
S1 S2 S3 S4
COM2
COM1 PRINTER CONN.
FDD CONN.
SECONDARY (IDE2)
M 4 M 3 M 2 M 1
JP1
IMI
VL-Bus Slot (Slave)
JP17
1
Main BIOS
1
1
PCI#3 PCI#2 PCI#1
SC464
JP12 JP13
85C496
SIS
1
PS3
<
VT82C42N

Hardware Design 2-1
2-1 Motherboard Layout
Chapter 2
Hardware design
The 486SPM is designed with SiS85C496/497 PCI/ISA/VESA chipset which is
developped by SiS Corporation to fully support 486 PCI/ISA/VESA system. The
486SPM utilize the green functions provided in the chipset to support power saving
features when the system is in standby state. The 486SPM layout is shown in
previous page (left page) for user's reference. Care must be taken when inserting
memory modules, inserting 486 processor or even plugging PCI/VESA card into
associated slots to avoid damaging any circuits or sockets on board. A cooling fan
is strongly recommended when installing processor due to possible overheat.
The 486SPM supports minimum of 1MB of System Memory and maximum of
256MB while Cache Memory can be 128KB up to 1MB to increase system perfor-
mance.
The 486SPM supports dual ports Enhanced IDE connector, and detects IDE
harddisk type by BIOS utility automaticlly. It also built-in SMC FDC37C665
Super multi-I/O contrrroller.
The 486SPM supports Award BIOS. The BIOS can be located in EPROM or Flash
ROM. The advantage of having Flash ROM is much easier to replace BIOS code if
necessary.

2-2 486SPM
1.Power LED(+)
2.N/C
3.GND
4.Keylock
5.GND
+
5
1
1
4
2-2 Connectors and Jumpers
This section describes all of the connectors and jumpers equipped in the
motherboard. Please refer to Figure 1-1 for actual location of each connector and
jumper.
J1 KeyLock - Keyboard lock switch & Power LED connector.
J2 Speaker - connect to the system's speaker for beeping.
1. Speaker
2. N/C
3. GND
4. GND
J3 Reset - Close to restart system.
J4 Turbo Switch : Close for higher speed while Open for
slower speed. A BIOS hot key <CTRL><ALT><+>
also brings system to a higher speed while
<CTRL><ALT><-> set system to a slower speed.
J5 Turbo LED indicator - LED ON when higher speed is
selected.
J6 Power Saving LED indicator - LED ON when system is in
any Saving mode.
J7 Sleep Switch - Force system to enter the Suspend mode.
J8 IDE LED indicator - LED ON when IDE Harddisk activity.
+
+

Hardware Design 2-3
JP1 Battery connector
1-4 : External Battery connector
3-4 : Discharge Battery (Clear CMOS Data)
JP2 ROM type selection : 1-2 for 12V Flash ROM while 2-3 for 5V
Flash ROM or EPROM.
JP5 CPU Selection : Open for Intel 80486DX4 while colse for other
CPU.
JP7 AMD (NV8T) CPU CLKMUL : Open for 3X CLK (80486DX4-
100) while Close for 2X CLK(80486DX2-66/80).
JP8 AMD X5 (5x86) CLKMUL : Open for 3X CLK(X5-150MHz)
while Close for 4X CLK(X5-133/160MHz).
JP10 CPU Selection : 2-3 for UMC U5 while 1-2 for other CPU.
JP14 CPU working voltage selection : 1-2,3-4,5-6 for 5V CPU
while Open for 3.3V CPU.(Reserved)
JP16 CPU Selection : Open for Cyrix Cx486DX2 v80 while Close
other CPU.
JP17 CPU Selection : 1-2 for Intel/AMD/UMC CPU, 2-3 for Cyrix
DX2v66/80(3.3V) while open for Cyrix DX/DX2-66/80(5V).
1
4
2-3 : Normal
1
3
1
1

2-4 486SPM
72 1
72 1
72 1
72 1
M3
M1
M2
M4
2-3 System Memory Configuration
The 486SPM supports "Table Free" DRAM configuration and different type of
settings for the system memory. There is no jumper nor connector needed for
memory configuration. You can choice any SIMM socket to insert any type of
72 pins SIMM which you have.
S1,S2,S3,S4,S5,S6,S7 : CPU Selection (Insert the "0 ohm " Resister Pack)
1
(IMISC464)
CPU CLOCK Selection :
JPS1 CPU CLK JPS1 JPS2 JPS3 CPU TYPE
25 MHz OPEN OPEN 1-2 DX2-50/DX4-75
JPS2 33 MHz CLOSE CLOSE 1-2 DX2-66/DX4-100/X5-133
40 MHz CLOSE OPEN 1-2 DX2-80/DX4-120/X5-160
JPS3 50 MHz OPEN CLOSE 2-3 DX-50/X5-150
S6 : 486DX/2/4/Cyrix M7/AMD(NV8T)/Cyrix 5x86
S7 : Intel P24D/AMD(SV8B)/AMD X5
S1 : UMC/AMD(NV8T)
S2 : Intel-SL
S3 : Cyrix M7
S4 : Intel P24D/Cyrix 5X86/AMD(SV8B)/AMD X5
S5 : 486SX/U5S
Note :
1. AMD(NV8T) = Standard Am486 = Normal CPU/3.3V/8K Cache/Write Through
3. AMD 5x86 = AMD X5
2. AMD(SV8B) = Enhanced Am486 = SL-Enhanced/3.3V/8K Cache/Write Back
4. Cyrix 5x86 = Cyrix M1SC

Hardware Design 2-5
2-4 Cache Memory Configuration
The second level of cache is installed in the motherboard to increase the system
performance. The 486SPM supports different type of combinations for the cache
installation. Jumper 12,13 and 15 settings are used to differential such combina-
tions. Please refer to following configurations for the details.
CACHE TAG SRAM Data SRAM Jumper Setting
Size (U27) Install JP12 JP13 JP15
32K8 x 4 1-2,3-4
128KB 8K8 x 1 U17,18,19,20 1-2 1-2 5-6
32K8 x 8 2-3,4-5
256KB 16K8 x 1 U17,18,19,20 2-3 1-2 6-7
U23,24,25,26
64K8 x 4 1-2,3-4
256KB 16K8 x 1 U17,18,19,20 2-3 1-2 5-6
64K8 x 8 2-3,4-5
512KB 32K8 x 1 U17,18,19,20 2-3 2-3 6-7
U23,24,25,26
128K8 x 4 1-2,3-4
512KB 32K8 x 1 U17,18,19,20 2-3 2-3 5-6
128K8 x 8 2-3,4-5
1MB 64K8 x 1 U17,18,19,20 2-3 2-3 6-7
U23,24,25,26
1
3
1
7
J15
J12 J13
U26 U25 U24 U23
U20 U19 U18 U17
U27
TAG DATA SRAM

2-6 486SPM
2-5 Super multi -I/O Controller
The 486SPM built in (SMC FDC37C665GT) super mulit-I/O controller. It supports
1 floppy port (up to 2.88MB ), 1 parallel port(EPP/ECP optional) and 2 serial ports
(16550 fast UART compatible). And all of the ports can be ENABLE or DISABLE
by BIOS Utility.(Please refer to Figure 3-4 CHIPSET FEATURES SETUP)
J12 : Floppy Port
J13 : Serial Port 1 (COM1)
J14 : Serial Port 2 (COM2)
J15 : Parallel Port (Printer)
JP20, JP21 Parallel Port ECP/EPP Mode DMA Channel select : 1-2 for
DMA3 while 2-3 for DMA1.
1 6 1 6
5 10 5 10
1 2
1 2
33 3425 26
J12
J15
J13J14
1
PS3 : PS/2 MOUSE CONNECTOR
5
1
1 : DATA (Red Wire)
4 : NC
2 : CLOCK (Blue Wire)
3 : GND (Green Wire)
5 : VCC (Yellow Wire)