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

[Dave McGuire]

  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