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

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