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ADLINK Technology LittleBoard 735, Справочное руководство

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Chapter 2

Product Overview

4

Reference Manual

LittleBoard 735

      

Figure  2-1.   Stacking PC/104 Modules with the 

LittleBoard 735

Product Description

The LittleBoard 735 is an exceptionally high integration, high performance, rugged, and high quality single-
board system, which contains all the component subsystems of a PC motherboard plus the equivalent of up 

to 3 expansion boards. Based on the Intel Atom N270 low power, high-integration processor, the 

LittleBoard 735 gives designers a complete, high performance, embedded processor based on the EBX form 
factor and conforms to the EBX V2.0 specifications. 

Each LittleBoard 735 incorporates an Intel 945GSE chipset for the Graphics and Memory Hub 

(Northbridge) and the I/O Hub (Southbridge) controllers. This set includes the 82945GSE, Graphics and 
Memory Controller Hub, (also GMCH), which controls the graphics and memory interface. The other chip 

in this set is the 82801GBM, I/O Controller Hub 7 Mobile (ICH7-M), which controls some of the I/O 

functions on the board. One additional chip provides the remainder of the I/O functions: the Standard 
Microsystems, SCH3114I-NU, Super I/O controller. Together the Intel and SMSC chips provide four serial 

ports, an EPP/ECP parallel port, six USB 2.0 ports, PS/2 keyboard and mouse interfaces, floppy, one Ultra/

DMA 33/66/100 IDE controller supporting Compact Flash, independent 10/100BaseT and 10/100/
1000BaseT Ethernet interfaces, an audio AC’97 CODEC, PCIe Mini Card, GPIO, SMBus, and two SATA 

ports on the board. To provide the ISA bus on the board through the PC/104 connector, an ITE IT8888G-L, 

PCI-to-ISA Bridge is included. The LittleBoard 735 also supports up to 2GB of DDR2 RAM in a single 
200-pin SODIMM slot, and a Graphics Media Accelerator (GMA), which provides CRT, TV Out, and 

LVDS flat panel video interfaces for most popular LCD panels. 

The LittleBoard 735 can be expanded through the PC/104 and PC/104-Plus expansion for additional system 
functions, as these buses offer compact, self-stacking, modular expandability. The PC/104 and PC/104-Plus 

buses are the embedded system version of the signal set provided on a desktop PC’s ISA and PCI buses at 

8MHz and 33MHz clock speeds, respectively.

Among the many embedded-PC enhancements on the LittleBoard 735 that ensure embedded system 

operation and application versatility are a watchdog timer, serial console support, battery-free boot, on-

board, high-density Compact Flash socket, and BIOS extensions for OEM boot customization. 

The LittleBoard 735 is particularly well suited to either embedded or portable applications and meets the 

size, power consumption, temperature range, quality, and reliability demands of embedded system 

applications. It can be stacked with ADLINK MiniModules™ or other PC/104-compliant expansion boards, 
or it can be used as a powerful computing engine.

4-40 nuts (4)

PC/104 Module

PC/104 Plus Module

Little Board735

ISA Bus
Stackthroug
Expansion
Headers

0.6 inch spacers (4)

      PCI Stack

         Headers      

through

4-40 screws (4)

0.6 inch spacers (4)

Содержание LittleBoard 735

Страница 1: ...LittleBoard 735 Single Board Computer Reference Manual P N 50 1Z020 1000 ...

Страница 2: ... the bottom of this notice Audience This manual provides reference only for computer design engineers including but not limited to hardware and software designers and applications engineers ADLINK Technology Inc assumes you are qualified to design and implement prototype computer equipment ii Reference Manual LittleBoard 735 TRADEMARKS CoreModule and the Ampro logo are registered trademarks and AD...

Страница 3: ...hanical Specifications 16 Chapter 3 Hardware 17 Overview 17 Interrupt Channel Assignments 18 Memory Map 19 I O Address Map 19 Floppy Drive Interface 20 Parallel Port Interface 21 Serial Interfaces 22 Utility Interfaces 26 Utility 1 Interface 26 Keyboard Interface 26 External Battery 26 Reset Switch 26 Speaker 26 Utility 2 Interface 27 System Management Bus SMBus 27 Mouse Interface 28 USB Interface...

Страница 4: ...ure 2 2 Functional Block Diagram 7 Figure 2 3 Component Locations Front view 9 Figure 2 4 Component Locations Back view 10 Figure 2 5 Pin Sequence Identification 12 Figure 2 6 Connector Locations Top view 13 Figure 2 7 LittleBoard 735 Dimensions 16 Figure 3 1 RS485 Serial Port Implementation 22 Figure 3 2 Oops Jumper Connection 37 Figure 3 3 Hot Cable Jumper 38 List of Tables Table 2 1 Major Integ...

Страница 5: ...o Interface Pin Signals J9 31 Table 3 14 CRT Interface Pin Signals J3 32 Table 3 15 LVDS Interface Pin Signals J26 33 Table 3 16 TV Out Pin Signals J36 34 Table 3 17 Power Supply Input Pin Signals J19 34 Table 3 18 ATX Power Header Pin Signals J30 35 Table 3 19 Power On Button Interface Pin Signals J46 35 Table 3 20 User GPIO Pin Signal Descriptions J40 36 Table 3 21 SMBus Pin Signal Descriptions ...

Страница 6: ...Contents vi Reference Manual LittleBoard 735 ...

Страница 7: ... The following list of references may be helpful for you to complete your design successfully Most of these references are also available on the Ampro By ADLINK web site in the InfoCenter The InfoCenter was created for embedded system developers to share ADLINK s knowledge insight and expertise Specifications EBX Spec Revision 2 0 March 1 2005 For the latest version of the EBX specifications conta...

Страница 8: ...trollers respectively Web site http download intel com design network datashts 82562gt pdf Ethernet Web site http download intel com design network datashts 82574 pdf Gigabit Ethernet Standard Microsystems Corp and the SCH3114I NU chip used for the Super I O controller Web site http www smsc com main catalog sch311x html Realtek and the ALC203 chip used for the Audio CODEC Web site http www realte...

Страница 9: ...embedded computing solutions can be designed into space constrained environments with off the shelf components The EBX standard boasts highly flexible and adaptable system expansion allowing easy and modular addition of functions such as additional USB 2 0 ports Firewire or wireless networking not usually contained in standard product offerings The EBX system expansion is based on popular existing...

Страница 10: ...hernet interfaces an audio AC 97 CODEC PCIe Mini Card GPIO SMBus and two SATA ports on the board To provide the ISA bus on the board through the PC 104 connector an ITE IT8888G L PCI to ISA Bridge is included The LittleBoard 735 also supports up to 2GB of DDR2 RAM in a single 200 pin SODIMM slot and a Graphics Media Accelerator GMA which provides CRT TV Out and LVDS flat panel video interfaces for...

Страница 11: ...e standard floppy disk drive interface Supports all standard PC AT formats 360KB 1 2MB 720KB 1 44MB 2 88MB Parallel Port Provides a standard printer interface Supports IEEE standard 1284 protocols of EPP and ECP outputs Supports Bi directional data lines Supports 16 byte FIFO for ECP mode Serial Ports Four buffered serial ports with full handshaking Provides 16550 equivalent controllers each with ...

Страница 12: ...rts full duplex or half duplex mode Full duplex mode supports transmit and receive frames simultaneously Supports IEEE 802 3x Flow control in full duplex mode Half duplex mode supports enhanced proprietary collision reduction mode Video Interfaces CRT LVDS TV Out Support CRT 2048 x 1536 with up to 64MB UMA Unified Memory Architecture AGP 4X equivalent graphics performance Dual channel 9 12 or 18 b...

Страница 13: ...82574IT with Internal Transformer PC 104 Plus Bus Connector PCI ISA Bridge PCI Express Mini Card Connector PC 104 Connector SATA Connectors 2 RJ45 External Ethernet Transformer RJ45 Ethernet Controller 82562GT Keyboard Mouse Floppy Parallel COM 3 COM 4 RS232 Transceiver RS422 485 Transceiver and COM 1 COM 2 RS232 Transceiver RS422 485 Transceiver and CRT Header TV Out Header PCI Bus ISA LCI USB Po...

Страница 14: ...ntroller U10 Intel 82574IT 10 100 1000BaseT Gigabit Ethernet controller LAN0 Ethernet Function Ethernet Controller U12 Intel 82562GT 10 100BaseT Fast Ethernet controller LAN1 Ethernet Function ISA Bridge U13 ITE IT8888F PCI to ISA bridge ISA Bus Audio AC 97 CODEC U14 Realtek ALC203 LF Audio AC 97 CODEC for audio signals Audio In Out RS232 Transceiver U17 Maxim MAX213ECAI RS232 Transceiver for COM1...

Страница 15: ...Chapter 2 Product Overview LittleBoard 735 Reference Manual 9 Figure 2 3 Component Locations Front view LB735_Comp_Top_b U4 U13 U14 U10 U12 U25 U22 U21 ...

Страница 16: ...ch unless otherwise indicated Table 2 2 Header and Connector Descriptions Jack Name Description BAT1 Battery Socket Battery socket for 3 volt Lithium battery J1A B C D PC 104 bus 104 pin standard connector for PC 104 J2A B C D PC 104 Plus 120 pin 0 079 2mm standard connector for PCI bus J3 Video CRT 12 pin 0 079 2mm header for output to a CRT type monitor J6 IDE 40 pin standard header for the prim...

Страница 17: ...isplays J30 Power On 3 pin header for ATX power on functions J31 Memory 200 pin 0 024 0 60mm socket for DDR2 SDRAM SODIMM J32 SATA1 7 pin 0 050 1 27mm standard connector for serial ATA J33 SATA2 7 pin 0 050 1 27mm standard connector for serial ATA J34 Optional Fan 3 pin header provides 5V or 12V tach and ground to optional CPU fan J35 Battery Input 2 pin 0 049 1 24mm header for power from external...

Страница 18: ...even numbering where pin 2 is directly across from pin 1 is noted as 20 pin 2 rows odd even 1 2 Alternately a 20 pin connector using consecutive numbering where pin 11 is directly across from pin 1 is noted in this way 20 pin 2 rows consecutive 1 11 The second number in the parenthesis is always directly across from pin 1 See Figure 2 5 20 pin two rows Consecutive 1 11 Or 1 2 3 4 5 6 7 8 9 10 20 1...

Страница 19: ...common ground is connected The grounding holes 8 of the LittleBoard 735 are connected to ground potential return of the DC power supply connected to the board through J19 NOTE Pin 1 is shown as a black pin square or round on all headers in all illustrations J30 J45 BAT1 J10 J23 J19 J46 J35 JP6 LB735_Conn_b JP7 JP8 JP1 J40 J26 J3 J9 J32 J33 J2 J1 J16 J12 J11 J39 J14 J44 J6 J13 J15 Ethernet Groundin...

Страница 20: ...ult JP5 Fan Voltage Selection Enable 5V pins 1 2 Enable 12V pins 2 3 Default JP6 Compact Flash Master Slave Enable Slave pins 1 2 Default ATA Master Enable Master pins 2 3 ATA Slave JP7 Compact Flash Voltage Selection Enable 5V pins 1 2 Enable 3 3V pins 2 3 Default JP8 LVDS Voltage Selection Enable 3 3V pins 1 2 Default Enable 5V pins 2 3 JP9 Serial Port 4 RS485 Termination Enable Termination pins...

Страница 21: ...l loop back two Ethernet connections four USB loop backs one USB flash drive and one Compact Flash reader with 64MB Compact Flash Thermal Cooling Requirements The CPU Memory Hub I O Hub and voltage regulators are the sources of heat on the board The LittleBoard 735 is designed to operate at the maximum speed of the CPU 1 6GHz The Atom N270 CPU requires a heatsink but no fan for 40 C to 85 C operat...

Страница 22: ...al Specifications Figure 2 7 shows the top view of the LittleBoard 735 with the mechanical mounting dimensions Figure 2 7 LittleBoard 735 Dimensions NOTE All dimensions are given in inches LB735_Dimen_Top_b 7 22 0 20 0 20 0 0 7 80 5 80 5 70 2 80 2 65 7 60 5 55 5 35 0 20 0 ...

Страница 23: ...arallel Interface Serial Interfaces Utility Interfaces Keyboard Mouse Battery Reset Switch Speaker SMBus USB Interfaces Audio Interface Video Interfaces CRT LVDS TV Out Power Interfaces Power In ATX Power Power On Button Miscellaneous Time of Day RTC Temperature Monitoring User GPIO Interface SMBus Interface Oops Jumper BIOS recovery Serial Console Watchdog timer Optional CPU fan External Battery ...

Страница 24: ...dard headers and connectors such as PC 104 Ethernet RJ45 40 pin IDE Floppy and Compact Flash Table 3 1 Interrupt Channel Assignments Device vs IRQ No 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Timer X Keyboard X Secondary Cascade X COM1 O D O O COM2 D O O O COM3 O O O D COM4 O O D O Floppy X Parallel O D O O RTC X IDE D Math Coprocessor X PS 2 Mouse X PCI INTA O O D O O O O O O O O PCI INTB O O O O O D...

Страница 25: ...00FFFFFh System BIOS Area Storage and RAM Shadowing Top 0 1 or 8MB of DRAM Integrated Graphics Memory FFE00000h FFFFFFFFh System Flash Table 3 3 I O Address Map Address hex Subsystem 0000 000F Primary DMA Controller 0020 0021 Master Interrupt Controller 0040 0043 Programmable Interrupt Timer Clock Timer 0060 Keyboard Controller 0061 NMI Speaker control 0063 NMI Controller 0064 Keyboard Controller ...

Страница 26: ...0 00EF System reserved 00F0 00FF Math Coprocessor 01F0 01F7 IDE Hard Disk Controller 0200 0240h Mapped to ISA 0240 0260h Mapped to ISA 0279h Mapped to ISA 02E8 02EF Serial Port 4 COM4 02F8 02FF Serial Port 2 COM2 0300 0340h Mapped to ISA 0340 0360h Mapped to ISA 0378 037F Parallel Port Standard and EPP 03B0 03BB Video monochrome 03C0 03DF Video VGA 03E8 03EF Serial Port 3 COM3 03F0 03F5 Floppy Dis...

Страница 27: ...alize This signal used to Initialize printer Output in standard Mode I O in ECP EPP mode 7 PD2 I O Parallel Port Data 2 Refer to pin 3 for more information 8 SLIN Out Select In This output signal is used to select the printer I O pin in ECP EPP mode 9 PD3 I O Parallel Port Data 3 Refer to pin 3 for more information 10 12 GND Ground 11 PD4 I O Parallel Port Data 4 Refer to pin 3 for more informatio...

Страница 28: ...n 4 to 6 at the Serial A interface header J11 as shown in Figure 3 1 As an alternate tie pin 2 to 3 and pin 7 to 8 at the DB9 serial connector for Serial Port 1 as shown in Figure 3 1 Refer also to the following tables for the specific pin signals on each connector Figure 3 1 RS485 Serial Port Implementation Table 3 5 defines the pins and corresponding signals for the Serial A interface header Ser...

Страница 29: ...level flow control RX1 If in RS485 or RS422 mode this pin is Receive Data 1 7 4 DTR1 Data Terminal Ready 1 Indicates this Serial port is powered initialized and ready Used as hardware handshake with DSR1 for overall readiness to communicate 8 9 RI1 Ring Indicator 1 Indicates external serial communications device is detecting a ring condition Used by software to initiate operations to answer and op...

Страница 30: ...y DTR3 as part of the DTR DSR handshake 2 6 DSR3 Data Set Ready 3 Indicates external serial communications device is powered initialized and ready Used as hardware handshake with DTR3 for overall readiness to communicate 3 2 RXD3 RX3 Receive Data 3 Serial port 3 receive data in RX3 If in RS485 or RS422 mode this pin is Receive Data 3 4 7 RTS3 TX3 Request To Send 3 Indicates Serial port 3 is ready ...

Страница 31: ...nd 4 Indicator to serial output port 4 is ready to transmit data Used as hardware handshake with CTS4 for low level flow control TX4 If in RS485 or RS422 mode this pin is Transmit Data 4 15 3 TXD4 TX4 Transmit Data 4 Serial port 4 transmit data out TX4 If in RS485 or RS422 mode this pin is Transmit Data 4 16 8 CTS4 RX4 Clear To Send 4 Indicator to serial port 4 that external serial communications ...

Страница 32: ...d uses 16 pins 2 rows odd even 1 2 with 0 100 pin spacing Keyboard Battery Reset Switch Speaker External voltages 3 3V Out to Power On LED and 5V Power Out to Keyboard Keyboard Interface The signal lines for a PS 2 keyboard are provided through the Utility 1 interface which is also fully PC AT compatible External Battery An external battery input connection is provided through a Utility 1 interfac...

Страница 33: ...e corresponding binary addresses of these devices on the SMBus Table 3 7 Utility 1 Interface Pin Signals J15 Pin Signal I O Description 1 NC Not connected 12V Power 2 GND I Ground 3 NC Not connected 5V Power 4 GND I Ground 5 LED O Power On LED This on board 3 3 volts is provided through 330 ohm resistor to an external Power On LED 6 NC Not connected Power Good 7 SPKR O Speaker Output This signal d...

Страница 34: ...ere is insufficient power to boot the system 4 NC O Not connected IR Mode select 5 NC Not connected IR Transmit Data 6 NC Not connected IR Receive Data 7 GND Ground 8 VCC 5 Volts 9 MDATA I O Mouse Data Data signal provided to external mouse connector 10 MCLK I O Mouse Clock Clock signal provided to external mouse connector 11 GND Ground 12 VCC 5 Volts 13 SMBCLK SMBus Clock Clock signal provided to...

Страница 35: ...ication Legacy USB Support The I O Hub Southbridge supports three USB Universal Host Controller Interfaces UHCI and each Host Controller includes a root hub with two separate USB ports each for a total of six USB ports The USB Legacy features implemented in the USB ports include the following Three root hubs for six USB ports Support for USB v1 1 and UHCI v1 1 with integrated physical layer transc...

Страница 36: ...USB 2 3 Interface Pin Signals J14 Pin Signal Description 1 USBPWR2 5 volts power USB 2 2 USBPWR3 5 volts power USB 3 3 USB2 USB 2 Data Negative 4 USB3 USB 3 Data Negative 5 USB2 USB 2 Data Positive 6 USB3 USB 3 Data Positive 7 USB GND2 USB 2 Ground 8 USB GND3 USB 3 Ground 9 USB GND2 USB 2 Ground 10 USB GND3 USB 3 Ground Table 3 12 USB 4 5 Interface Pin Signals J39 Pin Signal Description 1 USBPWR4 ...

Страница 37: ... or ground Table 3 13 Audio Interface Pin Signals J9 Pin Signal Description 1 NC Not connected Video Audio In signal left channel 2 VIDEO_GND Video Audio ground 3 NC Not connected Video Audio In signal right channel 4 CD_L CD ROM signal left channel 5 CD_GND CD ROM Audio ground 6 CD_R CD ROM signal right channel 7 LINE_IN_L Line In signal left channel 8 LINE_IN_GND Line In Audio ground 9 LINE_IN_R...

Страница 38: ...Out features Support for three integrated 10 bit DACS Support for overscaling Provide NTSC PAL Provide component s video and composite output interfaces Support HDTV 480p 720p 1080i 1080p CRT Interface Table 3 14 describes the pin signals of the CRT interface which uses 12 pins 2 rows odd even sequence 1 2 with 0 079 2mm pitch Note The shaded areas denote power or ground Table 3 14 CRT Interface P...

Страница 39: ...1 12 LBDATA1_N Data Negative Output 13 LBDATA0_P Data Positive Output 0 14 LBDATA0_N Data Negative Output 15 LVDS_BKLT_CTL Control Panel Backlight NA NA 16 LVDD_EN Enable Panel Power NA NA 17 LACLK_P Clock Positive Output Clock Channel 1 18 LACLK_N Clock Negative Output 19 Not Supported N A N S 20 Not Supported N A 21 LADATA2_P Data Positive Output 2 22 LADATA2_N Data Negative Output 23 LADATA1_P ...

Страница 40: ...r supply input header which uses 7 pins single row with 0 156 3 96mm pitch Table 3 16 TV Out Pin Signals J36 Pin Signal Description 1 TVDAC A TVDAC Channel A Output TVDAC_A supports the following Composite CVBS signal Component Chrominance Pb analog signal 2 TV_GND Ground 3 TVDAC B TVDAC Channel B Output TVDAC_B supports the following S Video Luminance analog signal Component Luminance Y analog si...

Страница 41: ...or the J46 Power On Button header which uses 5 pins single row with 0 100 2 54mm pitch Note The shaded area denotes power or ground Table 3 18 ATX Power Header Pin Signals J30 Pin Signal Description 1 PS_ON Power Supply On This signal is sent to the ATX power supply by the LittleBoard 735 to turn On the ATX power supply This signal can also be used to turn Off the ATX power supply or go into a sus...

Страница 42: ...how to use the GPIO pins resides in the Miscellaneous Source Code Examples on the LittleBoard 735 Support Software QuickDriveTM The example program can be built by using the make bat file This produces a 16 bit DOS executable application gpio exe which can be run on the LittleBoard 735 to demonstrate the use of GPIO pins For more information about the GPIO pin operation refer to the Programming Ma...

Страница 43: ...igure 3 2 Figure 3 2 Oops Jumper Connection Serial Console The LittleBoard 735 supports the serial console or console redirection feature This I O function is provided by an ANSI compatible serial terminal or the equivalent terminal emulation software running on another system This can be very useful when setting up the BIOS on a production line for systems that are not connected to a keyboard and...

Страница 44: ...oot The OS or application must tickle the WDT as soon as it comes up This can be done by accessing the hardware directly or through a BIOS call During System Operation An application can set up the WDT hardware through a BIOS call or by accessing the hardware directly Some ADLINK Board Support Packages provide an API interface to the WDT The application must tickle the WDT in the time set when the...

Страница 45: ... Table 3 23 lists the pin signals of the External Battery Input header which uses 2 pins single row with 0 049 1 24mm pitch Note The shaded areas denote power or ground Table 3 23 External Battery Input Header J35 Pin Signal Description 1 VCC 5 0 volts DC 5 2 GND Ground ...

Страница 46: ...Chapter 3 Hardware 40 Reference Manual LittleBoard 735 ...

Страница 47: ...ng the BIOS Setup in serial console mode is very similar to the steps you use to enter BIOS Setup with a VGA display except the actual keys you use 1 Set the serial terminal or the PC with communications software to the following settings 115k baud 8 bits One stop bit No parity No hardware handshake 2 Connect the serial console or the PC with serial terminal emulation to Serial Port 1 or Serial Po...

Страница 48: ... windows and four memory windows are available for mapping I O Port or Memory regions to ISA modules by specifying the window length and base address By default the following I O port windows are mapped to ISA modules 200 240h 240 260h 279h 300 340h 340 360h A79h By default no memory windows are mapped to ISA modules Any of the DMA channels 0 1 2 3 5 6 7 can be mapped to ISA modules by changing th...

Страница 49: ... options selected in BIOS Setup while the OS boots Logo Screen Image Requirements The user s image may be customized with any standard image editing tool The LittleBoard 735 logo screen utility supports the following image formats Bitmap image Exactly 640 x 480 pixels Exactly 16 colors Bitmap image 16 Color 640x480 pixels 256 Color 640x480 pixels JPG image 16 Color 640x480 pixels PCX image 256 Col...

Страница 50: ...Chapter 4 BIOS Setup 44 Reference Manual LittleBoard 735 ...

Страница 51: ...also request personal assistance by creating an Ask an Expert account and then going to the Ask a Question feature Requests can be submitted 24 hours a day 7 days a week You will receive immediate confirmation that your request has been entered followed by an e mail response Once you have submitted your request you must log in to My Stuff where you can check status update your request and access o...

Страница 52: ...Appendix A Technical Support 46 Reference Manual LittleBoard 735 ...

Страница 53: ...tery RTC 36 LittleBoard 735 Atom N270 CPU 4 audio AC 97 interface 31 block diagram 7 console redirection feature 37 CPU features 5 dimensions 14 EBX Architecture 3 features 5 Floppy Disk Drive features 20 GPIO features 36 headers and connectors 10 major chip list 8 major integrated circuit list 8 Parallel port features 21 pin 1 locations 13 product description 4 see also supported features 4 seria...

Страница 54: ...nments 18 ISA bus 5 jumper headers on board 14 LVDS interface 33 memory 5 memory map 19 on board battery 6 Oops jumper BIOS recovery 6 37 parallel port 21 parallel port 1 5 PC Beep speaker interface 26 PC 104 bus 5 PC 104 Plus bus 5 power on switch 35 PS 2 keyboard interface 6 26 PS 2 mouse interface 6 Real time clock 6 reset switch interface 26 RS485 termination 4 22 RS485 two wire port 22 serial...

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