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SCSI Port Pin Specification

SCSI Port Pin Specification

Summary

This section lists the pin specifications for the SCSI port.

SCSI Port
Illustration

Figure A–1 shows the pin numbers on the SCSI port.

Figure A–1 SCSI Port

GA_EN00290A_93A

1

25

26

50

SCSI Port Pin
Specification

Table A–2 describes the functions of the pins on the SCSI port.

Table A–2 SCSI Port Pin Specification

Pin

Function

Pin

Function

1

Chassis ground

26

SCSI bus data 0

2

Chassis ground

27

SCSI bus data 1

3

Chassis ground

28

SCSI bus data 2

4

Chassis ground

29

SCSI bus data 3

5

Chassis ground

30

SCSI bus data 4

6

Chassis ground

31

SCSI bus data 5

7

Chassis ground

32

SCSI bus data 6

8

Chassis ground

33

SCSI bus data 7

9

Chassis ground

34

SCSI bus data parity

10

Chassis ground

35

Chassis ground

11

Chassis ground

36

Chassis ground

(continued on next page)

Specifications A–3

Summary of Contents for Adaptec AHA-1742A

Page 1: ...ation Order Number EK A0652 UG 001 July 1993 This manual describes how to install configure and use the Adaptec AHA 1742A SCSI adapter for the DEC 2000 Model 300 AXP and DECpc AXP 150 systems Revision Information This is a new manual Digital Equipment Corporation Maynard Massachusetts ...

Page 2: ...r future patent rights nor do the descriptions contained in this document imply the granting of licenses to make use or sell equipment or software in accordance with the description Digital Equipment Corporation 1993 All Rights Reserved The postpaid Reader s Comments form at the end of this document requests your critical evaluation to assist in preparing future documentation The following are tra...

Page 3: ...he Onboard SCSI Terminators 1 4 Removing the Onboard SCSI Terminators 1 4 Installing the SCSI Adapter 1 5 Installation Procedure 1 5 Connecting External SCSI Devices 1 6 Connection Procedure 1 6 Connection Illustration 1 7 Testing the SCSI Connection 1 8 Updated SHOW DEVICE Display 1 8 2 Configuring the SCSI Adapter Introduction 2 1 In This Chapter 2 1 EISA Configuration Utility ECU 2 2 Running th...

Page 4: ...ndex Examples 1 1 Updated SHOW DEVICE Display 1 8 Figures 1 1 Disabling the Floppy Controller 1 3 1 2 Removing the SCSI Terminators 1 4 1 3 Connecting an External SCSI Device 1 7 A 1 SCSI Port A 3 Tables 1 1 Preinstallation Procedure 1 2 1 2 Connecting External Devices 1 6 1 3 Testing the SCSI Connection Using the SHOW DEVICE Display 1 8 2 1 Configuration Settings 2 2 2 2 Default Configuration 2 3...

Page 5: ... for both experienced and inexperienced users Structure of This Manual This manual contains three chapters an appendix and an index as follows Chapter 1 describes how to install and use the SCSI adapter Chapter 2 describes how to configure the SCSI adapter Chapter 3 contains troubleshooting information Appendix A lists the specifications for the SCSI adapter The index is a reference to the main to...

Page 6: ...s of manuals n nn A period in numerals signals the decimal point indicator For example 1 75 equals one and three fourths UPPERCASE Words in uppercase indicate a command n A lowercase italic n indicates the generic use of a number For example 19nn indicates a 4 digit number in which the last 2 digits are unknown Note A note contains information of special importance to the reader Caution A caution ...

Page 7: ...es a diskette drive controller and it allows you to connect up to seven SCSI devices either internal or external to the system In This Chapter This chapter contains the following sections Preparing to Install the SCSI Adapter Disabling the Floppy Controller Removing the Onboard SCSI Terminators Installing the SCSI Adapter Connecting External SCSI Devices Installing the SCSI Adapter 1 1 ...

Page 8: ... ready to connect the external SCSI devices immediately after installing the SCSI adapter remove the terminators from the SCSI adapter See the section entitled Removing the Onboard SCSI Terminators for information on removing the terminators Second No internal device connections permitted If you are connecting external devices do the following 1 Disable the floppy controller on the SCSI adapter Se...

Page 9: ...r in the system you must disable the floppy disk controller on the second SCSI adapter To disable the floppy controller remove the jumper from pin number 1 of J6 on the SCSI adapter Figure 1 1 shows the default position of the jumper Figure 1 1 Disabling the Floppy Controller GA_EN00500A_93A 1 2 3 4 5 6 J6 Installing the SCSI Adapter 1 3 ...

Page 10: ...nators If you want to connect external SCSI devices to the system unit you must remove the three onboard SCSI terminators from the SCSI adapter Figure 1 2 shows how to remove the SCSI terminators from the SCSI adapter Figure 1 2 Removing the SCSI Terminators GA_EN00501A_93A 1 1 4 Installing the SCSI Adapter ...

Page 11: ...eady to install the SCSI adapter For information on opening the system unit and installing an option board see the DECpc AXP 150 and DEC 2000 Model 300 AXP Customer Technical Information manual Note If you are replacing the default SCSI adapter or installing the first SCSI adapter you must replace the SCSI ribbon cables after you have installed the SCSI adapter Installing the SCSI Adapter 1 5 ...

Page 12: ...vice to the system Table 1 2 Connecting External Devices Step Action 1 Hold in both connector clips on one end of the SCSI cable and connect it to the SCSI port on the system unit then release the clips 2 Connect the other end of the SCSI cable to the SCSI device 3 Set the on off switches on the device on other peripherals connected to the system unit and on the system unit to the on position 1 6 ...

Page 13: ...nal SCSI Devices Connection Illustration Figure 1 3 shows how to connect the SCSI device to the system unit Figure 1 3 Connecting an External SCSI Device 2 3 4 5 6 SGL 1 GA_EN00321A_93A Installing the SCSI Adapter 1 7 ...

Page 14: ...or information on troubleshooting 3 Examine the ADDR column to make sure that the SCSI ID in each SCSI address is unique If the SCSI ID is not unique you must reset the SCSI ID on the new device to an unused SCSI ID See the device documentation for information on setting the SCSI IDs Updated SHOW DEVICE Display Example 1 1 shows a sample of an updated SHOW DEVICE display Example 1 1 Updated SHOW D...

Page 15: ...roduction This chapter describes how to configure the system after you have installed the AHA 1742A SCSI adapter In This Chapter This chapter contains the following section EISA Configuration Utility ECU Configuring the SCSI Adapter 2 1 ...

Page 16: ...e of settings that are available for the AHA 1742A SCSI adapter Table 2 1 Configuration Settings Function Choice of Settings Host Adapter Interface Enhanced mode only Host Adapter BIOS BIOS Base Address CC000H BIOS Base Address D0000H BIOS Base Address D4000H BIOS Base Address D8000H BIOS Base Address DC000H BIOS Base Address E0000H BIOS Base Address E4000H BIOS Base Address E8000H BIOS Base Addre...

Page 17: ...on settings for the AHA 1742A SCSI adapter Table 2 2 Default Configuration Function Default Setting Host Adapter Interface Enhanced Mode Host Adapter BIOS BIOS Base Address CC000H Host Adapter SCSI ID Device ID 7 SCSI Bus Reset at Power on Enable SCSI Bus Reset Configuring the SCSI Adapter 2 3 ...

Page 18: ......

Page 19: ...ion The SCSI adapter device name does not appear in the power up self test display The SCSI adapter is not seated firmly Remove the SCSI adapter and reinsert it firmly in the option slot The SCSI adapter is not correctly configured or the configuration conflicts with another installed option board Use the ECU to check the configuration and if necessary reconfigure the SCSI adapter to resolve the c...

Page 20: ...Cpc AXP 150 and DEC 2000 Model 300 AXP Customer Technical Information for more information If the problem persists contact your system administrator You cannot read or write from a SCSI device The media is faulty See the DECpc AXP 150 and DEC 2000 Model 300 AXP Customer Technical Information for more information on troubleshooting the SCSI drive The error could be a system error Enter the SHOW DEV...

Page 21: ...pc AXP 150 and DEC 2000 Model 300 AXP Customer Technical Information for information on testing the SCSI adapter The error code could be a system error code See the DECpc AXP 150 and DEC 2000 Model 300 AXP Customer Technical Information for more information If the problem persists contact your system administrator Troubleshooting 3 3 ...

Page 22: ......

Page 23: ...ion This appendix lists the specifications for the AHA 1742A SCSI adapter and the SCSI port In This Appendix This appendix contains the following sections SCSI Adapter Specification SCSI Port Pin Specification Specifications A 1 ...

Page 24: ...ions for the AHA 1742A SCSI adapter Table A 1 Specification Table Power Requirements DC Amps 5V 0 25V 2 9 Amps maximum Operating Environment Operating temperature 0 C to 55 C Storage temperature 0 40 C to 75 C Relative humidity 10 to 95 non condensing EISA Identification Adaptec AHA 1742A SCSI Adapter ADP0002 A 2 Specifications ...

Page 25: ...n the SCSI port Table A 2 SCSI Port Pin Specification Pin Function Pin Function 1 Chassis ground 26 SCSI bus data 0 2 Chassis ground 27 SCSI bus data 1 3 Chassis ground 28 SCSI bus data 2 4 Chassis ground 29 SCSI bus data 3 5 Chassis ground 30 SCSI bus data 4 6 Chassis ground 31 SCSI bus data 5 7 Chassis ground 32 SCSI bus data 6 8 Chassis ground 33 SCSI bus data 7 9 Chassis ground 34 SCSI bus dat...

Page 26: ... 15 Chassis ground 40 Chassis ground 16 Chassis ground 41 SCSI bus ATN 17 Chassis ground 42 Chassis ground 18 Chassis ground 43 SCSI bus BSY 19 Chassis ground 44 SCSI bus ACK 20 Chassis ground 45 SCSI bus RST 21 Chassis ground 46 SCSI bus MSG 22 Chassis ground 47 SCSI bus SEL 23 Chassis ground 48 SCSI bus CD 24 Chassis ground 49 SCSI bus REQ 25 Chassis ground 50 SCSI bus I O A 4 Specifications ...

Page 27: ...nnecting 1 6 testing the connection 1 8 F Floppy controller 1 2 disabling 1 3 I Installing the SCSI adapter installation procedure 1 5 preparation 1 2 Internal SCSI devices 1 2 S SCSI devices external 1 2 internal 1 2 SCSI ribbon cables 1 5 SCSI terminators removing 1 4 Specifications SCSI adapter specification A 2 SCSI port pin specification A 3 T Troubleshooting 3 1 Index 1 ...

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