>I tried 3 VAXstations 4000/60 on all them I got  the same problem
>if I Attach an external SCSI CD-ROM the device is not seen by show >dev and 
>I do not know why.

Which kind of SCSI has supported your CD-ROM? Did you use SCSI-terminator? 
(I installed 1.4Y from SCSI CD-ROM on VS4000/60 without any problem)

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