Are old SCSI tape drives not all created equal?

[Jon Elson]

On 08/17/2016 01:07 PM, js at cimmeri.com wrote:
>
>   Hi, folks.
>
>   I'm experimenting with various old SCSI tape drives to 
> see which
> will work with my PDP-11/34 with an Emulex SCSI card.
>
>   To my surprise, not all SCSI tape drives are created equal.
Right, there was SCSI, SCSI-II and SCSI-III.  Also, a lot of 
drives did not correctly support SOME features that others 
did.  it got VERY messy.  Other drives had weird timing 
restrictions, or certain commands must be given is a 
specific order, or they caused an error or lack of response.

Jon