[HECnet] RT-11 filesystems, was Re: DECnet-RT?

[Clem Cole]

exactly.   You could use some COTS tapes if you carefully cut the case with
a box cutter to make the notch, which we as students got pretty good at.
IIRC Memorex worked best.  You could not use the really cheap tape, but DEC
used saturation recording.   The official DECcassettes and compatible from
the aftermarket sellers cost more than what you got at the music store in
Oakland.

On Tue, Mar 31, 2020 at 5:04 PM Dave McGuire <mcguire at neurotica.com> wrote:

>
>   He's talking about DECcassette, not DECtape.  The DECcassette looks
> like a standard Philips-style audio tape (of Walkman fame) but has a
> notch in the top.
>
>             -Dave
>
> On 3/31/20 5:01 PM, Thomas DeBellis wrote:
> > Are you referring to DECtape II?  That was a cassette.
> >
> > I was referring to the (nearly indestructible) earlier format: simply
> > called DECtape or DECtape I.  It's the same media as LINCtape (a small
> > reel), but with a very different controller.  These could store a little
> > over 70K (36 bit) words.
> >
> > On 3/31/20 4:40 PM, Clem Cole wrote:
> >> Dave the TA11 (DEC proprietary Phillps Cassettes) were 150 ft long.
> >>  I just looked in my 1976 Peripherals Handbook -- Tape capacity of
> >> 92,000 bytes (not kbytes mind you).   Two tapes per TA11; one for the
> >> OS and the other the user.   We had a couple at CMU on 11/20's running
> >> RT-11 in the EE Digital lab for the RT system's course - in fact, the
> >> famous "110v non-maskable interrupt" occurred on one of those machines
> >>
> >> On Tue, Mar 31, 2020 at 3:14 PM Dave McGuire <mcguire at neurotica.com
> >> <mailto:mcguire at neurotica.com>> wrote:
> >>
> >>     On 3/31/20 2:33 PM, Thomas DeBellis wrote:
> >>     > 32MB really was ginormous back in the day; our labs had RT on
> >>     RK05's,
> >>     > which held about 2.5MB.  Way more than a DECtape.
> >>
> >>       When I started out, I had it on RL01s.  But I suspect you have a
> few
> >>     years on me. ;)  That was quite a bit of space at the time.
> >>
> >>                 -Dave
> >>
> >>     --
> >>     Dave McGuire, AK4HZ
> >>     New Kensington, PA
> >>
>
>
> --
> Dave McGuire, AK4HZ
> New Kensington, PA
>
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