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AM-6000 Computer Owner's Manual, Rev. 00
Appendix D - SCSI Termination
SCSI TERMINATION USING EXTERNAL TERMINATOR OPTION
The preferred method of terminating the SCSI bus in an AMOS based computer is the installation of an
external terminator. In April 1993, the external SCSI bus terminator became standard on all AMOS
computers. Using an external terminator makes installing an add-on subsystem (like a portable CD-
ROM drive) easier, eliminating the need to remove terminators from a SCSI device located in the host
computer. In the AM-6000, the external terminator must be an “active” terminator. An active terminator
is included with your AM-6000.
The AM-176 board is sensitive to incorrect SCSI bus termination. If you are using the external
terminator and one of the SCSI devices inside the computer also has its terminators installed,
you will experience problems.
The SCSI bus must be terminated at each end of the cable. The AM-176 terminates one end of the bus.
The other end must be terminated by an active style external terminator. An active terminator for the
narrow SCSI bus (PRA-00222-21) is included with the AM-6000; an active terminator for the Wide
SCSI bus (PRA-00222-20) is included in the Wide SCSI option kit.
To use the external terminator, make sure none of the SCSI peripherals inside the computer are
terminated. The termination power for the SCSI bus is provided by the AM-176 board.
The external terminator is shown in Figure A-1:
SCSI
(PRA-00222-21)
EXTERNAL SCSI BUS
ACTIVE TERMINATOR
BAIL LOCKS
NARROW SCSI TERMINATOR
Figure D-1: Active External Terminator Installation
- Computer Owner's 1
- 1998 ALPHA MICROSYSTEMS 2
- Table of Contents 3
- List of Illustrations 7
- List of Tables 7
- Chapter 1 - Introducing the 8
- AM-6000 Computer 8
- ABOUT THIS BOOK 10
- Graphics Conventions 10
- HARDWARE FEATURES 11
- AM-319-20 System Board 11
- AM-176 Board 12
- Processor 12
- Cache Memory 12
- CMOS Menu Setup 12
- External SCSI Port 13
- SCSI Tape Drives 14
- AM-219 Diskette Controller 14
- Serial I/O Capability 14
- Network Options 14
- UPS Monitoring 15
- Front Panel Status Display 15
- Real Time Clock 15
- Rear I/O Panel 16
- System Versatility 16
- Add-On Equipment 16
- SOFTWARE FEATURES 16
- SERVICE INFORMATION 17
- For Further Assistance 17
- Chapter 2 - Installation 18
- Reporting Shipping Damage 19
- STATUS SELECT RESET 22
- Page 2-6 Chapter Two 23
- PREPARING THE SITE 24
- Physical Requirements 24
- Environmental Requirements 25
- Environmental Specifications 25
- POWER AND CABLE CONNECTIONS 26
- Voltage Current Draw 27
- Turning the Computer On 28
- Connecting the Cable 29
- INITIAL TESTING 30
- BOOTING UP UNDER AMOS 30
- THE WARM BOOT MONITOR 31
- TURNING THE COMPUTER OFF 31
- EXPANDING YOUR COMPUTER 32
- GETTING ASSISTANCE 32
- Chapter 3 - Getting Started 33
- CMOS Menu Options 34
- Saving the CMOS Settings 36
- Important Note 36
- DEVICE NAMES 36
- The System Disk 37
- DISK ACCOUNTS 37
- LOGGING ON 38
- THE TERMINAL KEYBOARD 39
- Correcting Typing Mistakes 40
- A WORD ABOUT DISKETTES 41
- Using Diskettes 42
- Mounting Diskettes 44
- ABOUT STREAMING TAPE 45
- Tape Capacity 45
- WINDOW SHUT = WRITE ENABLE 47
- WINDOW OPEN = WRITE PROTECTED 47
- Chapter 4 - Where Do I 49
- Go From Here? 49
- Text Preparation 50
- Utility Programs 50
- Application Programs 50
- Office Information Products 50
- ADDITIONAL DOCUMENTATION 51
- BACKING UP YOUR DATA 53
- Passwords 54
- Organizing the Disk 54
- Adding New Accounts 54
- Adding Jobs 58
- Changing User Memory 59
- ANALYZING THE DISK 60
- The REDALL Command 61
- The DSKANA Command 61
- DSKANA Options 62
- Chapter 6 - Preventive 66
- Maintenance 66
- DISKETTE DRIVE 67
- DAT DRIVE CLEANING 67
- MAIN ENCLOSURE 68
- Chapter 7 - Troubleshooting 69
- Procedures 69
- Procedure #3: Powerup/Reset 73
- Procedure #5: Self Test 76
- Procedure #6: Alternate Boot 78
- SELF TEST FEATURE 85
- Appendix A - Connector 86
- Configurations 86
- WHAT IS RS-422? 87
- IMPORTANT NOTE 87
- CABLE CONSTRUCTION GUIDELINES 87
- Cable Length 87
- Cable Type 88
- Cable Shielding 88
- RS-232 DB-9 CONNECTOR SIGNALS 89
- Workstation Connection Cables 91
- PARALLEL PRINTER PORTS 93
- AM-6000 UPS STATUS PORT 94
- 10BaseT Topology and Cabling 94
- Appendix B - The Control 96
- Characters 96
- Appendix C - Super I/O 98
- NARROW SCSI TERMINATOR 100
- ATTACHING EXTERNAL DEVICES 101
- TERMINATOR POWER 101
- Appendix E - Read-Ahead and 102
- Write Buffering 102
- WRITE BUFFERING 103
- Controlling Read-Ahead 103
- Potential Pitfalls 104
- Setting Up Write Buffering 104
- FINAL NOTES 105
- Document History 106
- Index Page 3 109
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