Alpha Microsystems SCSI Dokumentacja Pobierz pdf (Strona 7)

Page 3Installation Instructions: SCSI Disk Drives

6.0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 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 in 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 none of your SCSI peripherals inside

the computer are terminated. You will also need to follow the guidelines in the 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 1:

SCSI

(PRA-00222-00)

EXTERNAL SCSI BUS

TERMINATOR

CONFIGURATION B

CONFIGURATION A

BAIL LOCKS

MAC821

#4 SCREW

AND WASHER

Figure 1. External Terminator Installation

PDI-00436-20, Rev. A15

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Alpha Microsystems SCSI Dokumentacja Strona 7