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ST-MGXm3HB User's Manual Version 0.1
Page 1
ST-MGXm3HB
User's Manual
Version 0.1
Cyrix is a registered trademark of Cyrix Corporation.
Cyrix trademarks include:
Cx5530, Display Compression Technology (DCT), MGXm, 
MediaGXm,XpressAUDIO,                    
XpressGRAPHICS, XpressRAM,                        
Virtual System Architecture(VSA)
SuperTek Express Technology Inc. reserves the right to make 
changes in the devices or specification described herein without 
notice.  Before design in or order placement, customers are advised 
to verify that the information on which orders or design activities are 
based is current. SuperTek Express Technology Inc. warrants its 
products to conform to current specification in accordance with Cyrix's 
standard warranty.  Testing is performed to the extent necessary as 
determined by to support this warranty.
Web: http://www.supertek.com.tw
Sales: sales@supertek.com.tw

Page 2
Introduction                                                                                                             
1
 Introduction
1.1. PREFACE
Welcome to use ST-MGXm-3HB Cyrix MediaGX MMX All-In-One 
System Board.  You can be very easy to enjoy the highest level of 
total integration solution through your Pentium-Class PC.  Of course, 
you are more than to get an un-achievable price of full features 
system board without any compromise of the performance, now you 
just have a 6-in-1 (Games, MPEG, Graphics, Processor, Lan, Sound,) 
system board with Cyrix MediaGXm integrated x86 solution plus MMX 
technology support.
The Cyrix MediaGX processor family's latest member-GXm is an 
advanced 64-bit x86 compatible processor that offering high 
performance, fully accelerated 2D graphics, a 64-bit Synchronous 
DRAM controller and PCI bus controller, all on a single chip, plus it is 
compatible with MMX technology.  In addition to the advanced CPU 
feature, a 16-Kbyte write-back L1 cache is accessed in a novel 
fashion that eliminates pipe-line stalls to fetch operands that hits in 
the cache, a separate on-chip video buffer enable >30FPS 
MPEG1/MPEG2 video playback, a tightly-coupled Synchronous 
DRAM controller supports the Graphics and system memory 
accesses and eliminates the need for an external L2 cache.
Also, from this system board, you can have Cyrix's Virtual System 
Architecture (VSA) enabling XpressGraphics and XpressAudio as 
well as generic emulation capabilities.  Software handler routines for 
XpressGraphics and XpressAudio are included in the BIOS and 
provide compatible BGA and a 16-bit industry standard audio 
emulation.  Please enjoy the fun of Multi-Media and start to set up 
your PC now following by this manual.
                                                                              S T -MGXm-3HB User's Manual
2
1.2. Key Features
*  Supports the MMX instruction set extension for the acceleration of 
multimedia applications.
*
64-bit Cyrix MediaGXm Processors 200MHz up to 3XX MHz
*
Cyrix CX5530 chipset supports Integrated Graphics, Sound and 
Memory control.
*
An internal 16-KByte Write-Back L1 cache
*
Enhanced System Management Mode (SMM)
*
Providing Power Management on only CPU suspend and 3V full 
suspend
*
Windows 95/98/NT Compliant
*
2 x 168 pin Dimm sockets support 3.3V SDRAM only.
* 
Expandable memory up to 128MB
* 2 Master PCI slots & 2 Master ISA slots 
*
On board VGA supports 1280x1024 x 8 BPP and 1024 x 768 x 16 
BPP.
*
On board Audio controller compatible with XprssAUDIO, 
MPU-401 Interface
* 
On board SMC-I/O chip supports 2 x 16550 compatible serial 
ports, 1 x standard SPP/EPP/ECP parallel port, 2 x 
1.2MB/1.44MB/2.88MB floppy disk driver interface
* 2-144MB D.O.C Supported.
* 2 x PCI IDE ports (Ultra-DMA mode 0/1/2, PIO mode 4)
* Supports PS/2 Mouse Port
* 2 x USB ports (cable option), 1 x IrDA connector , 1 x Game port
* PnP Flash EEPROM, Supports 120MB Diskette Bootup
*  4-Layer PCB,22 cm x 20 cm, Baby AT Form Factor
         

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H a r d w a r e   C o n f i g u r a t i o n                                                                                              
3
Hardware  
Configuration
2.1. Unpacking the Mainboard
 The ST-MGXm-3HB Cyrix MediaGX System Board
The Quick Reference Sheet
Disk Diskette DRIVER
MIDI Board
       Full Set Cables
2.2. Power Precautions
Before beginning configuration, make sure that you are working with 
an unplugged mainboard. Many components are powered by 
lower-voltage current, but there still may be a dangerous electric 
current coming from the leads and power supply.  You should take 
the following precautions.
* Turn off the power supply and unplug the power cord before you 
begin.
* Unplug all cables that connect the mainboard to any external 
devices.
                                                                     
ST-MGXm3HB User's Manual
4
2.2.1 AT Power Supply Connectors
* The power supply connectors are two six-pin male header 
connectors.  Plug the dual connectors from the power directly into 
the board connectors.
*  Most of the power supplies have two leads and each lead has six  
wires.  Two of which are black, orient the connectors, so the black  
wires are in the middle.
*  Detail pin description as below: 
Pin
Description
Pin
Description
1
Power Good
7
Ground
2
+5V DC
8
Ground
3
+12V DC
9
-5V DC
4
-12V DC
10
+5V DC
5
Ground
11
+5V DC
6
Ground
12
+5V DC
2.2.2 Memory Installation
DIMM 1/
BANK 1
(SDRAM ONLY)
8MB, 16MB, 32MB,64MB,128MB
168-pin DIMM
(Single Side, Double Side)
DIMM 2/
BANK 0 
(SDRAM ONLY)
8MB, 16MB, 32MB,64MB,128MB
168-pin DIMM
(Single Side, Double Side)
P12
P1
This black wires should be in the middle

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H a r d w a r e   C o n f i g u r a t i o n                                                                                              
5
2.2.3 REMAKER
You can configure hardware options by setting jumper on the 
mainboard. See Figure 2-A for jumper locations.
Set a jumper on SHORT and OPEN as follows:
 SHORT-- By placing the plastic jumper cap over two pins of the 
jumper. 
OPEN-- Remove the jumper cap from the jumper cap.
* SYMBOLS:
For setting 3-pin jumpers, the below symbols are used:
Pins 1 and 2 are Shorted with a jumper cap.
Pins 2 and 3 are Shorted with a jumper cap.
For setting 2-pin jumpers, the below symbols are used:
The jumper is Shorted when the jumper cap is placed 
over the two pins of the jumper.
   
 P2  P1
The jumper is Open when the jumper cap is removed 
from the jumper.
   P2  P1                   
P3
  
P2
  
P1
P3
  
P2
  
P1
                                                                     
ST-MGXm3HB User's Manual
6
2.3. MGXm3HB Component Location
SMC
FDC37C931
K/B
1
PS/2  
MOUSE
PWR1
PCI 1
PCI 2
DIMM2
P
R
N
1
COM2
COM1
Cyrix
 5530
 (BGA)
   ATX PWOER
FDD
IDE1
IDE2
DIMM1
PS1
BAT
GAME
MIDI1
1
USB
 JP3
  ON/OFF
 J21
    S1
1
2
10
9
1
3
19 20
1
2
  DOC
  BIOS
2.3.1. Jumper Setting-1
CPU TYPE:
CPU 
TYPE
GXm-200 *GXm-233 GXm-266 GXm-300 GXm-333
S1-1
S1-2
S1-3
S1-4
S1-5
OFF
ON
OFF
ON
OFF
OFF
ON
ON
OFF
OFF
OFF
ON
OFF
OFF
OFF
OFF
ON
ON
OFF
ON
OFF
ON
OFF
ON
ON

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H a r d w a r e   C o n f i g u r a t i o n                                                                                              
7
2.3.2. Jumper Setting-2
J5/J4: CD AUDIO INPUT
                       
J4: SONY
                     
J5: PASNONIC
                            P I N 4 :   L                             P I N 4 : G N D
                            P I N 3 :   G N D                       P I N 3 : L
              PIN2: GND           PIN2:GND
                            P I N 1 :   R                             P I N 1 : R
J21: CMOS CLEAR
CMOS CLEAR
*Normal
CMOS Clear
J21
S2: ATX ON/OFF
JP2: LED's CONN
JP7 Connector
Pin Out
Assignment
POWER 
/
2
VCC
STBY LED
4
Not Used
6
(-)LED
8
Not Used
10
Ground
Speaker
1
Data Out
3
Not Used
5
VCC
7
Ground
Turbo LED
13
Ground
14
(+)LED
Reset
15
Reset
16
Ground
SUSPEND
17
SMI
18
Ground
IDE LED
19
Access
20
VCC,(+)LED
1
1
J5  J4 
J4
1
20
19
2
1
                                                                     
ST-MGXm3HB User's Manual
8
2.3.3. Jumper Setting-3
J1: IR Connector
MIDI1: MIDI Board Connector
Pin Out
Assignment
Pin Out
Assignment
1
VCC
2
HSYNCB
3
VSYNCB
4
DDCSCAA
5
NC
6
NC
7
MIC
8
LINEINL
9
LINEINR
10
NC
11
NC
12
NC
13
NC
14
GND
15
GND
16
IOUTR
17
IOUTG
18
IOUTB
19
DDCSCLL
20
NC
21
NC
22
NC
23
NC
24
GND
25
LINE-IN-L
26
LINE-OUT-R
27
VCC
28
VCC
29
VCC
30
GND
IRTX
IRRX
GND
VCC
1
30
29
2

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H a r d w a r e   C o n f i g u r a t i o n                                                                                              
9
2.3.4 Jumper Setting-4
J20: ATX ON/OFF
JP2: LED's Connector
JP7 Connector
Pin Out
Assignment
POWER 
/
2
VCC
GREEN
STBY LED
4
Not Used
6
(-)LED
WHITE
8
Not Used
10
Ground
Speaker
1
Data Out
3
Not Used
5
VCC
7
Ground
Turbo LED
13
Ground
14
(+)LED
Reset
15
Reset
BLUE
16
Ground
BLACK
IDE LED
19
Access
WHITE
20
VCC,(+)LED
RED
JP3: DOC Address Setting
Jamper Setting
 Address
1-2 , 7-8
 C800
1-2 , 9-10
 CC00
3-4 , 7-8
 D000
3-4 , 9-10
 D400
5-6 , 7-8
 D800
5-6 , 9-10
 DC00
1
20
19
2
                                                                     
ST-MGXm3HB User's Manual
10
2.3.5. Jumper Setting-5
USB1: USB Cable Connector
USB2: USB Cable Connector
PINOU
T
USB1
PINOUT
USB2
1
VCC
1
VCC
2
DATA -
2
DATA-
3
DATA +
3
DATA+
4
GND
4
GND
5
NC
5
NC
FAN: Connector
PS1: PS2 Mouse Cable Connector
USB1
USB2
1
1
GND
GN
D
12V
DATA(RED)
VCC(YELLOW)
GND
CLK(BLUE)
GND 
(GREEN)

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H a r d w a r e   C o n f i g u r a t i o n                                                                                              
11
2.3.6. Jumper Setting-6
J20: ATX Power Supply
Connector
Pin Out Assignment
Pin Out Assignment
1
NC
11
NC
2
NC
12
-12V
3
GND
13
GND
4
+5V
14
PS-ON
5
GND
15
GND
6
+5V
16
GND
7
GND
17
GND
8
PWRGD
18
-5V
9
STB5V
19
+5V
10
+12V
20
+5V
11
1
20
10
                                                                     
ST-MGXm3HB User's Manual
12
2.4. Extend MIDI Board
1. Line Out Jack -- Connect your audio device, such as Speaker 
Audio into this jack
2. Line In Jack -- Connect your Audio Source to this jack
3. Microphone Jack -- Plug your Microphone to this jack
4. VGA Port -- Connect your Monitor to this port.
LINE OUT
LINE IN
MIC IN
VGA