8 Jun
2003
8 Jun
'03
6:33 a.m.
>I picked up
> several of the 7970E tape drives. They all say 45 IPS inside and all but
> one are marked "option 052/151", the other one is marked "option
183".
It
> was one of a pair that was mounted in one
cabinent and run off of a
single
> set of controller cards with some jumper cables
connecting the two
drives.
option 151 specifies 45ips, master PE read circuits, 9 track, PE write
circuits (1600bpi)
From what I've seen, -151 is the most common to find 'in the wild' these
days
I would suspect that 052 is an elective option, not a standard
configuration
option. I can't find any docs on option 052.
Option 183 I also can't find any docs on, but I would guess it is
something
related to being a slave drive.
HP 7970 tape drives could be read/write, read only, dual format, or
multiple
format. They could also be slave only units (where you
have to have a
master
to use it) or master.
I personally think the nicest setup for a single tape drive is
the -157/161/165 which are 3 varying speeds of a master that can deal with
7
or 9 track, PE or NRZI. However, these can't write
PE mode, only NRZI.
Lets
you read the most types of media though. Then the best
setup for two
drives
is either two 151's on two separate controllers,
or a 151 and 150
master/slave setup.
I find the manual on these options especially confusing.
Jay West