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

[Paul Koning]

No, TA11.  Different device entirely.  Rather old, it's mentioned in the 1973 peripherals handbook.  Unibus interface, unlike the TU58 which is connected via a UART.

	paul

> On Mar 31, 2020, at 5:01 PM, Thomas DeBellis <tommytimesharing at gmail.com> 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> 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