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MB820
®
Socket 478 Pentium 4
®
Intel 875P Chipset
Industrial Motherboard
USER’S MANUAL
Version 1.0
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Acknowledgments Award is a registered trademark of Award Software International, Inc. PS/2 is a trademark of International Business Machines Corporation. Intel and Pentium 4 are registered trademarks of Intel Corporation. Microsoft Windows is a registered trademark of Microsoft Corporation. Winbond is a registered trademark of Winbond Electronics Corporation. All other product names or trademarks are properties of their respective owners. ii MB820 User’s Manual
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Table of Contents Introduction ....................................................... 1 Checklist...........................................................................1 Product Description ..........................................................2 Board Dimensions.............................................................3 Installations ....................................................... 4 ATX Power Installation.....................................................5 Insta
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INTRODUCTION Introduction Checklist ® Your MB820 Pentium 4 motherboard package should include the items listed below: · The MB820 motherboard · This User’s Manual · 1 Backplate · 2 IDE Cable · 1 Floppy Cable · 2 SATA Cable · 1 Dual-Serial-Port Cable · 1 CD containing the following: · Chipset Drivers · Flash Memory Utility MB820 User’s Manual 1
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INSTALLATIONS Product Description ® The MB820 Pentium 4 motherboard incorporates the Intel 875P chipset that can utilize a single PGA478 processor of up to 3.2GHz or higher and supports FSB frequency of 400/533/800Mhz (100Mhz, 133Mhz, and 200Mhz HCLK respectively). ® The 875P chipset is designed for use with the Pentium 4 processor with 512-KB L2 cache on 0.13 micron process. The integrated MCH component provides the CPU interface, DDR interface, AGP interface, Hub Interface and
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INTRODUCTION Board Dimensions MB820 User’s Manual 3
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INSTALLATIONS Installations This section provides information on how to use the jumpers and connectors on the MB820 in order to set up a workable system. The topics covered are: ATX Power Installation Installing the Memory Setting the Jumpers Connectors on MB820 Watchdog Timer Configuration 4 MB820 User’s Manual
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INSTALLATIONS ATX Power Installation The system power is provided to the motherboard with the ATXP1 and ATXP2 ATX power connectors. ATXP2 is a 4-pin 12V power connector. ATXP1 is to be connected to a standard ATX power connector. Installing the Memory The MB820 motherboard supports four DDR memory sockets for a maximum total memory of 4GB in DDR memory type. You can install unbuffered & ECC DDR DIMMs. It supports DDR266 when installed with CPUs that have clock speeds of 400MHz.
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INSTALLATIONS Setting the Jumpers Jumpers are used on MB820 to select various settings and features according to your needs and applications. Contact your supplier if you have doubts about the best configuration for your needs. The following lists the connectors on MB820 and their respective functions. Jumper Locations on MB820.............................................................7 JP1: RS232/422/485 (COM2) Selection..........................................8 JP2: COM1 RS232
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INSTALLATIONS Jumper Locations on MB820 Jumper Locations on MB820 .............................................................. Page JP1: RS232/422/485 (COM2) Selection..................................................8 JP2: COM1 RS232 +5V/+12V Power Setting ........................................8 JP3: COM2 RS232 +5V/+12V Power Setting ........................................8 JP4: Clear CMOS Contents .......................................................................9 JP5:
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INSTALLATIONS JP1: RS232/422/485 (COM2) Selection COM1 is fixed for RS-232 use only. J3, COM2 is selectable for RS232, RS-422 and RS-485. The following table describes the jumper settings for COM2 selection. COM2 RS-232 RS-422 RS-485 Function Short: Short: Short: 1-2 3-4 5-6 Jumper 9-11 7-9 7-9 Setting 10-12 8-10 8-10 (pin closed) 15-17 13-15 13-15 16-18 14-16 14-16 JP2: COM1 RS232 +5V/+12V Power Setting JP2 Setting Function Pin 1-2 +12V Short/Closed Pin 3-4 Norma
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INSTALLATIONS JP4: Clear CMOS Contents Use JP4, a 3-pin header, to clear the CMOS contents. Note that the ATX-power connector should be disconnected from the motherboard before clearing CMOS. JP4 Setting Function Pin 1-2 Normal Short/Closed Pin 2-3 Clear CMOS Short/Closed JP5: COM3 RS232 +5V/+12V Power Setting JP5 Setting Function Pin 1-2 +12V Short/Closed Pin 3-4 Normal Short/Closed Pin 5-6 +5V Short/Closed JP6: COM4 RS232 +5V/+12V Power Setting
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INSTALLATIONS JP7: DiskOnChip Address Select JP7 Address D0000-D7FFF D8000-DFFFF (default) JP8: Onboard VGA Enable/Disable Use JP8 to enable or disable the onboard VGA controller. JP8 Setting Onboard VGA Pin 1-2 Enabled Short/Closed Pin 2-3 Disabled Short/Closed 10 MB820 User’s Manual
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INSTALLATIONS [ Connectors on MB820 The connectors on MB820 allows you to connect external devices such as keyboard, floppy disk drives, hard disk drives, printers, etc. The following table lists the connectors on MB820 and their respective functions. Connector Locations on MB820 ..........................................12 ATXP1: ATX Power Supply Connector...............................13 ATXP2: ATX 12V Power Connector...................................13 DIMM1, DIMM2: DDR Channe
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INSTALLATIONS Connector Locations on MB820 12 MB820 User’s Manual
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INSTALLATIONS ATXP1: ATX Power Supply Connector ATXP1 is a 20-pin ATX power supply connector. Refer to the following table for the pin out assignments. 11 1 Signal Name Pin # Pin # Signal Name 3.3V 11 1 3.3V -12V 12 2 3.3V Ground 13 3 Ground PS-ON 14 4 +5V Ground 15 5 Ground Ground 16 6 +5V Ground 17 7 Ground -5V 18 8 Power good +5V 19 9 5VSB 20 10 +5V 20 10 +12V ATXP2: ATX 12V Power Connector Pin # Signal Name 1 Ground 2 Ground 3 +12V 4 +12V
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INSTALLATIONS CN1: PS/2 Keyboard and PS/2 Mouse Connectors PS/2 Mouse PS/2 Keyboard Keyboard Mouse Signal Name Signal Name Keyboard data 1 1 Mouse data N.C. 2 2 N.C. GND 3 3 GND 5V 4 4 5V Keyboard clock 5 5 Mouse clock N.C. 6 6 N.C. CN2: 4-port USB Connector CN2 is a USB connector consisting of four ports stacked vertically. Pin Signal Name 1 Ground 2 USB+ 3 USB- CN2 4 Vcc CN3, J3: Serial Ports CN3 (COM1) is a DB-9 connector, w
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INSTALLATIONS CN4: Parallel Port Connector CN4 is a DB-25 external connector situated on top of the VGA and serial ports. The following table describes the pin-out assignments of this connector. CN4 Parallel Port Signal Name Pin # Pin # Signal Name Line printer strobe 1 14 AutoFeed PD0, parallel data 0 2 15 Error PD1, parallel data 1 3 16 Initialize PD2, parallel data 2 4 17 Select PD3, parallel data 3 5 18 Ground PD4, parallel data 4 6 19 Ground PD5, parallel data 5 7
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INSTALLATIONS CN7: USB and LAN RJ45 Connectors CN7 consists of an RJ-45 connector (top) and two stacked USB ports. Refer to the section below for their respective pin assignments. USB0 Pin # Signal Name 1 Vcc 2 USB- 3 USB+ USB1 4 Ground CN8: Audio Connector CN8 is a 3-jack audio connector beside the USB/RJ45 combo connector. J1: IrDA Connector J1 is used for an optional IrDA connector for wireless communication. Pin # Signal Name 1 +5V 2 No connect
