Compaq MSB900L Serial Ports COM1-COM2, Floppy Disk Interface, Interrupt Controllers

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DIGITAL-LOGIC AG

MSB900/L Detailed Technical Manual V1.0

5.4.3.Serial Ports COM1-COM2

The serial channels are fully compatible with 16C550 UARTS. COM1 is the primary serial port, and is sup- ported by the board's ROM-BIOS as the PC-DOS 'COM1' device. The secondary serial port is COM2; it is supported as the 'COM2' device.

Standard: COM 1/2: National PC87317VUL: 2 x 16C550 compatible serial interfaces

Serial Port Connectors COM1, COM2

Pin

Signal Name

Function

in/out

DB25 Pin

DB9 Pin

1

CD

Data Carrier Detect

in

8

1

2

DSR

Data Set Ready

in

6

6

3

RXD

Receive Data

in

3

2

4

RTS

Request To Send

out

4

7

5

TXD

Transmit Data

out

2

3

6

CTS

Clear to Send

in

5

8

7

DTR

Data Terminal Ready

out

20

4

8

RI

Ring Indicator

in

22

9

9

GND

Signal Ground

 

7

5

The serial port signals are compatible with the RS232C specifications.

5.4.4.Floppy Disk Interface

This is not available with this product; use a USB Floppy.

5.5.Controllers

5.5.1.Interrupt Controllers

An 8259A compatible interrupt controller, within the chipset, provides seven prioritized interrupt levels. Of these, several are normally associated with the board's onboard device interfaces and controllers, and sev- eral are available on the AT expansion bus.

Interrupt:

Sources:

 

Onboard used:

 

IRQ0

ROM-BIOS clock tick function, from timer 0

 

yes

 

IRQ1

Keyboard controller output buffer full

 

yes

 

IRQ2

Used for cascade 2. 8259

 

yes

 

IRQ3

COM2 serial port

 

yes

 

IRQ4

COM1 serial port

 

yes

 

IRQ5

LPT2 parallel printer (if present)

 

no *

 

IRQ6

Floppy controller

 

yes

 

IRQ7

LPT1 parallel printer

 

yes

 

IRQ8

Battery backed clock

 

yes

 

IRQ9

Free for user

 

no *

 

IRQ10

Free for user

 

no *

 

IRQ11

Free for user

 

no *

 

IRQ12

PS/2 mouse

 

yes

 

IRQ13

Math. coprocessor

 

yes

 

IRQ14

Hard disk IDE

 

yes

 

IRQ15

Free for user

 

no *

 

 

 

* It may depend on the LAN configuration.

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Contents SBC MSB900/LMSB900/L Detailed Technical Manual About this Manual and How to Use ItTable of Contents 10.1 Environmental Protection Statement PrefaceTrademarks DisclaimerLimited Two Year Warranty Recycling InformationTechnical Support CE Conformity Explanation of SymbolsApplicable Documents and Standards RoHS Commitment For Your SafetyRoHS Compatible Product Design RoHS Compliant Production ProcessWeee Application Swiss Association for Quality and Management Sys- tems Swiss QualityDMA Standard Features of the MSB900/LUnique Features OverviewMSB900 Block Diagram MSB900/MSB900L specifications Power Supply Specification Mass Storage SpecificationStandard AT Interfaces Specification Name Peripheral Extension SpecificationRelated Application Notes Examples of Ordering CodesMSB900/L Dimensions & DiagramsDIGITAL-LOGIC AG DIGITAL-LOGIC AG DIGITAL-LOGIC AG MSB800CON Part Nr Board / Version Unit Tolerance Date / AuthorMm millimeter + / 0.1mm 25.10.2006 / BRR High Frequency Radiation to meet EN55022 MSB900/L Incompatibilities to a standard PC/ATAddressing PCI Devices Battery-LifetimeBUS Signals External battery assembling for the MSB900LVersion Date Status Modifications This Bios history is not for the following productsDetailed System Description Power RequirementsBoot Time Test environment for power consumption measurementInterfaces CPU, Boards and RAMsInterrupt Controllers ControllersSerial Ports COM1-COM2 Floppy Disk InterfaceRTC Real Time Clock Timers and CountersProgrammable Timers ROM-BIOS SocketsMap Bios Cmos SetupCmos RAM Map DeviceCmos Map Cmos Map Bit = Internal IDE Controller Disable Password Bits = Reserved 34h Minor CPU Revision Eeprom saved Cmos SetupEeprom Memory for Setup Memory & I/O MapSystem Memory Map Addr Function Size Comment System I/O mapIf KEL Memory Offset 100h0 = LPC MSB900/L Detailed Technical Manual MapMSR bit enables/disables into I/O Resolution Col. Dept Frequency VGA/LCD Controller of the Geode LX900Graphic Modes Flat cable Description of the ConnectorsConnector Structure Pin Remarks Video InputTop view of the MSB900/L Bottom view of the MSB900/L Power Supply Pin Signal Shield Power supply Pin SignalX14 X15 Operator Panel / Flat Panel bottom side GND Lvdsclkam Lvdsclkap GND LVDSYAP0 LVDSYAM0GND LVDSYAP1 LVDSYAM1 GND LVDSYAP2 LVDSYAM2X34 10/100 BASE-T Interface Connector Pin Signal X31 Keyboard PS/2 and Mouse Utility ConnectorConnector and Adapter Mini- DIN PS/2 6 PC Remarks X33 10/100 BASE-T Interface Connector Pin Signal CATX39 Serial Port COM2 Header onboard SUB connector Signal X50 USB 1 Connector Dual-USB Pin Signal RemarksX51 USB 2 Connector Dual USB Pin Signal Remarks X52 USB Udoc not assembled X60 IDE Interface Pin SignalPin Power supply GND Dlag boards have them as NC not connected X110 LPC-Port X101 PCI-104 BUS Interface PinX230 JTAG-Port Pin Signal X301 VGA Monitor CRT-Signals 15pins High-Density DSub PinTCK TMS TDI TDO Jumpers on MSB900/L Reload Default Bios SettingsDisabled Jumper Locations on the BoardDIGITAL-LOGIC AG Hard Disk Cable 44pin Cable InterfacesPin Signal COM1 9pin D-Sub male Pin Signal LPT1 25pin D-Sub femaleCOM1/LPT Serial Interface Cable COM2 Serial Interface Cable Pin Signal COM2 9pin D-Sub maleThermal Specifications Thermal Analysis for Case IntegrationMHz Uin MSB900/L Assembly ViewsDIGITAL-LOGIC AG Mechanical Dimensions PXE-BOOT and PXE-SETUP in the Bios Combined standard Dhcp and redirection servicesSeparate standard Dhcp and redirection services DIGITAL-LOGIC AG CHF PXE-LICENSE OrderProduct Currency Circle one MPC20 USDEMI / EMC Bios CmosCmos DramROM-BIOS RTC SQSUdoc USB VGA

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