Table of Contents

JUMPER LOCATION DIAGRAM	A

CONNECTOR LOCATION DIAGRAM	B								

CHAPTER 1   INTRODUCTION	1

1-1 SYSTEM FEATURES	1

1-2 CHECK LIST OF THE PACKING	2

CHAPTER 2   INSTALLATION	3

2-1 CPU INSTALLATION	3

2-2 SIM MODULES INSTALLATION	4

2-3 SRAM INSTALLATION	5

2-4 OTHER JUMPERS SETTING		6

CHAPTER 3   BIOS SETUP	7

APPENDIX A 	14

 

CHAPTER 1   INTRODUCTION
1-1 SYSTEM FEATURES
  Supports all of 5V and 3.3V 486 CPUs, includes AmDX4-100/120,
	Am5x86-P75, and Cyrix 5x86.
  Flexible architecture to support 128/256/512KB Direct mapped cache 	
	scheme.   
  Supports 4 stage power saving: On/Doze/Standby/Suspend.
  Supports L1/L2 Write back/Write through cache feature.
  Supports 72-pin dual type SIM modules.
  Memory configurations from 1MB up to 256MB by using 256KB/				1MB/4MB/8MB/16MB/32MB/64MB SIM module. 
  Supports SMI/SMM/PMU/APM power controllers.
  Dual IDE connectors support up to four devices in two channels.
  On-board high speed I/O includes 2 serial (16550 fast UART 
      compatible),	1 parallel (EPP/ECP), and 1 FDC.

REMARKS
Intel is a registered trademark of intel corporation.
AMD is a registered trademark of Advanced Micro Device, inc
CYRIX is a registered trademark of CYRIX,inc.
IBM ,IBM PC ,IBM AT and IBM XT are registered trademark of  International
Business Machines Corporations
SIS a is trademark of Silicon Integrated Systems.
UMC a is trademark of United Microelectronics corporation.

1-2 CHECK LIST OF THE PACKING

The mainboard comes securely packed in a durable box and shipping carton. 
Inside the box, the mainboard is sandwiched between two sheets of sponge
        and packed in an anti-static bag.

Each mainboard containing:
		Q'TY		Description
	 	 1		Mainboard : ATC-1425B
	 	 1		Diskette     : Enhanced IDE driver (3.5").
	 	 1		Cable         : Enhanced IDE connector.
	 	 1		Cable         : F.D.D connector.
	 	 1		Cable         : Serial port.
	 	 1		Cable         : Serial/Parallel.
	 	 1		Manual       : User`s manual.

 If any of the above items is missing or damaged, please contact the dealer 
        from whom you purchased.

        NOTE : Leave the mainboard in its original packing until you are ready to 
                     install it.

CHEAPTER 2   INSTALLATION
2-1 CPU INSTALLATION
      The following table listed Jumpers related locations areshown in page 1.
  
2-1-1   CPU type setting

A. Gerneral setting 

CPU type	JP18	JP19	JP20	JP21	JP22	JP23	JP24	
	486DX(5V)	open	open	1-2	2-3	2-3	open	open	
	486SX	open	open	1-2	2-3	2-3	open	open	

CPU type	JP25	JP26	JP27	JP28	JP29	JP30	JP31	
	486DX(5V)	open	open	1-2,3-4	open	open	open	3-4	
	486SX	open	open	2-3	open	open	open	open	

B. INTEL CPU setting 

CPU type	JP18	JP19	JP20	JP21	JP22	JP23	JP24	
	P24T	open	1-2	1-2	open	1-2	open	1-2	
	P24D	open	1-2	open	1-2	1-2	1-2	1-2	
	S-SERIES	open	1-2	1-2	2-3	2-3	open	open	

CPU type	JP25	JP26	JP27	JP28	JP29	JP30	JP31	
	P24T	3-4	1-2	1-2,3-4	2-3	open	1-2	2-3	
	P24D	1-2,3-4	open	1-2,3-4	2-3	2-3	4-5	3-4	
	S-SERIES	3-4	open	1-2,3-4	2-3	1-2	4-5	3-4	
※ A80486DX4-100 &EW is "WRITE-BACK" type, set "P24D" type.
    A80486DX4-100 &E is "WRITE-THROUGH" type, set "S-SERIES" type.        

C. AMD CPU setting 

CPU type	JP18	JP19	JP20	JP21	JP22	JP23	JP24	
	Am5x86-P75	close	1-2	1-2	1-2	1-2	1-2	1-2	
	Enhanced Am486	open	1-2	1-2	1-2	1-2	1-2	1-2	
	Am486DXL(3.45V)	open	2-3	※1-2/2-3	open	2-3	open	open	

CPU type	JP25	JP26	JP27	JP28	JP29	JP30	JP31	
	Am5x86-P75	1-2,3-4	open	1-2,3-4	2-3	2-3	4-5	3-4	
	Enhanced Am486 	1-2,3-4	open	1-2,3-4	2-3	2-3	4-5	3-4	
	Am486DXL(3.45V)	open	3-4	1-2,3-4	4-5	open	open	1-2,3-4	
(※1-2 486DX4; 2-3 486DX2)
  ※ A80486DX4-100SV8B and A80486DX4-120SV8B are "WRITE-BACK" 
               type, set "Enhanced Am486" type.
      A80486DX4-100NV8T and A80486DX4-120NV8T are "WRITE-
               THROUGH" type, set "Am486DXL(3.45V)" type, JP20 set "1-2".

D. CYRIX CPU setting 

CPU type	JP18	JP19	JP20	JP21	JP22	JP23	JP24	
CYRIX CX486	open	1-2	1-2	1-2	2-3	open	2-3	
	CYRIX 5x86	open	1-2	1-2	1-2	2-3	1-2	1-2	

CPU type	JP25	JP26	JP27	JP28	JP29	JP30	JP31	
	CYRIX CX486	2-3	2-3	1-2,3-4	1-2	open	2-3	3-4	
	CYRIX 5x86	1-2,3-4	open	1-2,3-4	2-3	2-3	4-5	3-4	

2-1-2   CPU speed setting                 
                                                  
CPU SPEED	   JP14	   JP13	   JP12	
	DX25/DX2-50/DX4-75	OPEN	OPEN	OPEN	
	DX33/DX2-66/DX4-100	OPEN	CLOSE	CLOSE	
	DX40/DX2-80/DX4-120	OPEN	OPEN	CLOSE	
	DX50	OPEN	CLOSE	OPEN	

2-1-3   CPU voltage setting 

CPU Voltage	JP34	JP35	
5V	1-2	open	
3.45V	2-3	1-3,2-4	
4V	2-3	3-5,4-6	

※NOTE:  	Am5x86-P75+   please follow the setting as 'Enhanced Am486',  
                                                'DX50',and '3.45V '; JP10 set '2-3'.
            	Am5x86-P90      please follow the setting as  'Am5x86-P75', 'DX40',  
                                                and '3.45V'; JP10 set '2-3'.

2-2   SIM MODULES INSTALLATION
The SiS 486 PCI/ISA mainboard can be expanded from 1MB to 256MB by using 256K, 1MB, 2MB, 4MB, 8MB, 16MB, 32MB, and 64MB of 72-pin SIM module.

※ "Free Table" feature is offered for main memory configuration. The product 
      works with one SIMM plugs into any SIMM sockets.

2-3   SRAM INSTALLATION
This mainboard can support cache memory from128K  to 512K bytes with the types of 32KX8, 64KX8, or 128KX8 SRAM.

Cache Configuration Size

Cache 
Size	TAG SRAM
(U21)	DATA SRAM
(U17-20)	JP16	JP32	JP33	JP36	
128K	8KX8	32KX8	1-2	1-2	1-2	1-2,3-4	
256K	32KX8	64KX8	2-3	1-2	2-3	1-2,3-4	
512K	32KX8	128KX8	1-2	2-3	2-3	1-2,3-4	

2-4   OTHER JUMPERS SETTING 

2-4-1  Other jumpers setting

	JP10			JP38※	
Synchronous clock	1-2		Flash ROM	1-2, 5-6	
Asynchronous clock	2-3		EPROM	2-3, 5-6	
※ The pin-5 and pin-6 is fixed 
by factory default setting. 

	J11	
External Battery	1-2	
Internal Battery	2-3	
Clear CMOS	3-4	

2-4-2  Connectors description

 Connector	Description	
J12	Reset	
J13	HDD LED	
J14	Turbo LED	
J15	Turbo Switch	
J16	Speaker Connector	
J17	Keylock	

CHAPTER 3   BIOS SETUP
AWARD BIOS SYSTEM CONFIGURATION SETUP 
This chapter explains how to set up system configuration (CMOS) under the
AWARD BIOS. The SETUP program is stored in the ROM on the mainboard. To do
the SETUP procedure, press <Del> key when the system is booting up. The
following main menu will appear. Please select "STANDARD CMOS SETUP" to
enter the next screen.    

ROM PCI/ISA BIOS (2A4IBA2H)
CMOS SETUP UTILITY
AWARD SOFTWARE, INC.
STANDARD CMOS SETUP	PASSWORD SETTING	
BIOS FEATURES SETUP	IDE HDD AUTO DETECTION	
CHIPSET FEATURES SETUP	SAVE & EXIT SETUP	
POWER MANAGEMENT SETUP	EXIT WITHOUT SAVING	
PCI CONFIGULATION SETUP		
LOAD BIOS DEFAULTS		
LOAD SETUP DEFAULTS		
Esc: Quit	:Select Item	
F10: Save & Exit Setup	(Shift)F2: Change Color	
Virus protection, Boot sequence ...		

The section at the bottom of the main menu explains how to control this screen. 
Another one section displays the items highlighted in the list.

This screen records, some basic hardware information, set the system clock and error
handling. These records can be lost or corrupted if the on-board battery  is fail or  
weakness.

ROM PCI/ISA BIOS (2A4IBA2H)
CMOS SETUP UTILITY
AWARD SOFTWARE, INC.
STANDARD CMOS SETUP	PASSWORD SETTING	
BIOS FEATURES SETUP	IDE HDD AUTO DETECTION	
CHIPSET FEATURES SETUP	SAVE & EXIT SETUP	
POWER MANAGEMENT SETUP	EXIT WITHOUT SAVING	
PCI CONFIGULATION SETUP		
LOAD BIOS DEFAULTS		
LOAD SETUP DEFAULTS		
Esc: Quit	:Select Item	
F10: Save & Exit Setup	(Shift)F2: Change Color	
Virus protection, Boot sequence ...		

ROM PCI/ISA BIOS (2A4IBA2H)
CMOS SETUP UTILITY
AWARD SOFTWARE, INC.
Date (mm:dd:yy)  : Mon, Oct.  2 1995		
Time(hh:mm:ss)   : 3 : 17 : 1		
HARD DISKS        TYPE    SIZE  CYLS     HEAD   PRECOMP  LANDZ  SECTOR           MODE	
Primary Master  : AUTO      0       0           0            0                 0               0              --------	
Primary Slave    : AUTO      0       0           0            0                 0               0              -------- 	
Primary Slave    : AUTO      0       0           0            0                 0               0               --------	
Primary Slave    : AUTO      0       0           0            0                 0               0               --------	
		
Drive A : 1.2M,  5.25  in.	 Base Memory           :       640K	
Drive B : None	 Extended memory    :  11264K	
	 Other Memory          :       384K	
Video  : EGA/VGA	  ------------------------------------------------	
Halt On: All Errors  	 Total Memory           :   12288K	
ESC  :  Quit                 :Select Item                 PU/PD/+/- : Modify	
F1     :  Help                (Shift) F2 : Change Color	

This screen is a list of system configuration options. Some of them are defaults required by the mainboard's design, others will be depended on the features of your system.

ROM PCI/ISA BIOS (2A4IBA2H)
CMOS SETUP UTILITY
AWARD SOFTWARE, INC.
STANDARD CMOS SETUP	PASSWORD SETTING	
BIOS FEATURES SETUP	IDE HDD AUTO DETECTION	
CHIPSET FEATURES SETUP	SAVE & EXIT SETUP	
POWER MANAGEMENT SETUP	EXIT WITHOUT SAVING	
PCI CONFIGULATION SETUP		
LOAD BIOS DEFAULTS		
LOAD SETUP DEFAULTS		
Esc: Quit	:Select Item	
F10: Save & Exit Setup	(Shift)F2: Change Color	
Virus protection, Boot sequence ...		

ROM PCI/ISA BIOS (2A4IBA2H)
BIOS FEATURES SETUP
AWARD SOFTWARE , INC.
Virus Warning	: Disabled	Video BIOS Shadow        : Enabled 	
CPU Internal Cache	: Enabled	C8000-CFFFF Shadow   : Disabled	
External Cache	: Enabled	D0000-D7FFF Shadow   : Disabled	
Quick Power On Self Test	: Disabled	D8000-DFFFF Shadow   : Disabled	
Boot Sequence	: A, C		
Swap Floppy Drive	: Disabled		
Boot Up Floppy Seek	: Enabled		
Boot Up NumLock Status	: On  	 	
Boot Up System Speed	: High	 	
Gate A20 Option	: Fast	 	
Typematic Rate Setting	: Disabled 		
Typematic Rate (Chars/Sec)	: 6		
Typematic Delay (Msec)	: 250	Esc : Quit               :Select Item	
Security Option	: Setup	F1   : Help             U/PD/+/- : Modify	
		F5   : Old Values   (Shift)F2:Color	
		F6   : Load BIOS Defaults	
		F7   : Load Setup Defaults	

This screen controls the setting for the chipset on the mainboard.
 
ROM PCI/ISA BIOS (2A4IBA2H)
CMOS SETUP UTILITY
AWARD SOFTWARE, INC.
STANDARD CMOS SETUP	PASSWORD SETTING	
BIOS FEATURES SETUP	IDE HDD AUTO DETECTION	
CHIPSET FEATURES SETUP	SAVE & EXIT SETUP	
POWER MANAGEMENT SETUP	EXIT WITHOUT SAVING	
PCI CONFIGULATION SETUP		
LOAD BIOS DEFAULTS		
LOAD SETUP DEFAULTS		
Esc: Quit	:Select Item	
F10: Save & Exit Setup	(Shift)F2:Change Color	
At clock, DRAM timings ....		

ROM PCI/ISA BIOS (2A4IBA2H)
CHIPSET FEATURES SETUP
AWARD SOFTWARE, INC.
Auto Configuration	: Enabled	Onboard 496B IDE Port	: Both	
		IDE 0 Master Mode	: Auto	
ISA Bus Clock	: 7.159MHz	IDE 0 Slave    Mode	: Auto	
LBD# Sample Point	:  End of T2	IDE 1 Master Mode	: Auto	
		IDE 1 Slave    Mode	: Auto	
Cache Write Cycle	: 2 CCLK	IDE Prefetch Read Buffer	: Disable 	
Cache Burst Read Cycle	: 1 CCLK 	IDE HDD Block Mode 	: Enable 	
L2 Cache/DRAM Cycle WS	: 2 CCLK			
		Onboard FDC Control	: Enable 	
DRAM RAS to CAS Delay	: 3 CCLK	Onboard Serial Port 1	: COM1	
DRAM Write Cycle	: 1 WS	Onboard Serial Port 2	: COM2	
DRAM Write CAS Pulse	: 2 CCLK	Onboard Parallel Port	: 378H	
DRAM CAS Precharge Time	: 1 CCLK	Onboard Printer Mode	: Compatible	
DRAM RAS to MA Delay	: 1 CCLK			
DRAM Speed	: Faster			
DRAM Slow Refresh	: Disable	Esc: Quit	:Select Item	
		F1  : Help	PU/PD/+/- :Modify  	
CPU Burst Write	: Disabied	F5  : Old Values	 (SHIFT)F2: Color	
L2 Cache Policy	: Write Back	F6  : Load BIOS Defaults		
L2 Cache Tag Bits	: 8 bits	F7  : Load Setup Defaults		

This screen controls the 'green' features of the mainboard.

ROM PCI/ISA BIOS (2A4IBA2H)
POWER MANAGEMENT SETUP
AWARD SOFTWARE, INC.
STANDARD CMOS SETUP	PASSWORD SETTING	
BIOS FEATURES SETUP	IDE HDD AUTO DETECTION	
CHIPSET FEATURES SETUP	SAVE & EXIT SETUP	
POWER MANAGEMENT SETUP	EXIT WITHOUT SAVING	
PCI CONFIGURATION SETUP		
LOAD BIOS DEFAULTS		
LOAD SETUP DEFAULTS		
Esc : Quit	:Select Item	
F10: Save & Exit Setup	(Shift)F2:Change Color	
Sleep Timer, Suspend Timer .....		

ROM PCI/ISA BIOS (2A4IBA2H)
POWER MANAGEMENT SETUP
AWARD SOFTWARE, INC.
Power Management	: Disabled	IRQ 4 (COM1)	:Enable	
PM Control by APM	: Yes	IRQ 5 (LPT 2)	:Enable	
Video Off Option	: Susp,Stby -> Off	IRQ 6 (Floppy Disk)	:Enable	
Video Off Method	: V/H SYNC+Blank	IRQ 7 (LPT 1)	:Enable	
Suspend Switch	: Disable	IRQ 8 (RTC Alarm)	:Disable	
                  **  PM Timers    	  **	IRQ 9 (IRQ2 Redir)	:Enable	
HDD Off After	: Disable	IRQ10(Reserved)	:Enable	
Doze Mode	: Disable	IRQ11(Reserved)	:Enable	
Standby Mode	: Disable	IRQ12(PS/2 Mouse)	:Enable	
Suspend Mode	: Disable	IRQ13(Coprocessor)	:Enable	
                  **  PM Events	  **     	IRQ14(Hard Disk)	:Enable	
PCI   Master Activity	: Disable	IRQ15(Reserved)	:Enable	
COM Ports Activity	: Enable			
LPT  Ports Activity	: Enable	Esc : Quit	:Select Item	
HDD Ports Activity	: Enable	F1  : Help                          	PU/PD/+/-:Modify	
DMA Ports Activity	: Disable	F5  : Old Values                    	(Shift) F2 : Color	
VGA Activity	: Disable	F6  : Load BIOS Defaults		
IRQ3   (COM  2)	: Enabled	F7  : Load Setup Defaults	 	

This screen configures the PCI Bus slots.

ROM PCI/ISA BIOS (2A4IBA2H)
POWER MANAGEMENT SETUP
AWARD SOFTWARE, INC.
STANDARD CMOS SETUP	PASSWORD SETTING	
BIOS FEATURES SETUP	IDE HDD AUTO DETECTION	
CHIPSET FEATURES SETUP	SAVE & EXIT SETUP	
POWER MANAGEMENT SETUP		
PCI CONFIGURATION SETUP		
LOAD BIOS DEFAULTS		
LOAD SETUP DEFAULTS		
Esc : Quit	:Select Item	
F10: Save & Exit Setup	(Shift)F2:Change Color	
Sleep Timer, Suspend Timer .....		

ROM PCI/ISA BIOS (2A4IBA2H)
PCI CONFIGURATION SETUP
AWARD SOFTWARE, INC.
PnP BIOS Auto-Config	: Enable	PCI Master Burst Read/Write : Disable		
			
Slot 1 Using INT#	: AUTO		
Slot 2 Using INT#	: AUTO		
Slot 3 Using INT#	: AUTO		

			
			
PCI IRQ Actived By	: Edge		
PCI IDE 2nd Channel	: Enable		
PCI IDE IRQ Map To	: PCI - AUTO		
  Primary     IDE INT#	: A	Esc: Quit              :Select Item	
  Secondary IDE INT#	: B	F1  : Help           PU/PD/+/-:Modify	
Master Arbitration Protocol 	: Weak	F5  : Old Values   (Shift)F2:Color	
CPU->PCI Mem Post Write Buf	: Enable	F6  : Load BIOS Defaults	
CPU->PCI Memory Burst Write	: Disable	F7  : Load Setup Defaults	

The last step is 'save and exit'. If you select this item and press 'Y', then these records
will be save in the CMOS memory on the mainboard. It will be chected every time when
you turn your computer on.

ROM PCI/ISA BIOS (2A4IBA2H)
CMOS SETUP UTILITY
AWARD SOFTWARE, INC.
STANDARD CMOS SETUP	PASSWORD SETTING	
BIOS FEATURES SETUP	IDE HDD AUTO DETECTION	
CHIPSET FEATURES SETUP	SAVE & EXIT SETUP	
POWER MANAGEMENT SETUP	EXIT WITHOUT SAVING	
PCI/GREEN FUNCTION SETUP		
LOAD BIOS DEFAULTS		
LOAD SETUP DEFAULTS		
Esc : Quit	:Select Item	
F10: Save & Exit Setup	(SHIFT)F2:Change Color	
Save data to CMOS & Exit setup		

ROM PCI/ISA BIOS (2A4IBA2H)
CMOS SETUP UTILITY
AWARD SOFTWARE, INC.
STANDARD CMOS SETUP	PASSWORD SETTING	
BIOS FEATURES SETUP	IDE HDD AUTO DETECTION	
CHIPSET FEATURES SETUP	SAVE & EXIT SETUP	
POWER MANAGEMENT SETUP	EXIT WITHOUT SAVING	
PCI/GREEN FUNCTION SETUPLOAD		
LOAD BIOS DEFAULTS	SAVE to CMOS and EXIT (Y/N):Y	
LOAD SETUP DEFAULTS		
Esc : Quit		
F10: Save & Exit Setup	(SHIFT)F2:Change Color	
Save data to CMOS & Exit setup		

APPENDIX A
※※TECHNICAL SUPPROT REQUEST FORM※※
If the mainboard doesn't function properly, please complete the following information
and return it to your supplier. If further information is needed, please attach  separate
sheets.

Model No :  ATC-1425B    Date of  Purchase :  ______________

Serial No : ___________________ 

HARDWARE :
	BRAND	MODEL	SPEED	Q'TY	
  CPU					
  Co-processor					
  SIM Module					
  Cache Memory					
  TAG SRAM					

 Chipset  Brand  :__________  Model  :__________ 
 Cache Memory :________KB  SIMM  :_______MB
 Bus Interface :  PCI x ______ ,   ISA x ______
 Hard Disk Interface Controller : ____ IDE, ____ SCSI
 Hard Disk Brand :___________, Model :_________, Capacity :________
 Display Controller Brand :_____________,Model :__________
	    	  Controller Chip Brand :_____________,Model :__________

  SOFTWARE: 
 SYSTEM BIOS:____ <A>AMI, <W>AWARD
                             Version _________  Date Code _____________
 Keyboard BIOS: Brand __________  

     Other Add-on Cards Information: 

Add-on Card	Bus Interface	Model 	Remark