Installation guide
APPENDIX A
Peripheral Device Terminators and
Termination Power
A.1SCSI 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 Early April of 1993, the external SCSI bus
terminator became standard on all AMOS based computer configurations. Using an
external terminator makes the task of installing an add-on subsystem (like a portable
CD-ROM drive) easier, eliminating the necessity of removing terminators from a SCSI
device located inside the host computer.
External terminators are available from Alpha Micro under part number PRA-00222-00.
To use the external terminator, you need to insure that none of your SCSI peripherals
inside the computer (or attached subsystem) are terminated. You will also need to
follow the guidelines in the following section on providing termination power for the SCSI
bus.
If you have a 10 or 21-slot rack mount VME computer and want to install an external
terminator, you will need to order a special adapter cable, DWB-10200-01. The adapter
cable is required, because there is no external SCSI connector on these computers.
The special cable has a connector that is compatible with the external terminator and
would also allow easy access to your computer for a portable CD-ROM drive or other
SCSI subsystem.
The external terminator is shown in Figure A-1:
PDI-03501-00, Rev. A00