On Thu, 27 Apr 2017 16:57:38 +0300, Maxim Bochagov wrote:
>Gil, looks like we are talking about the same but from different
>towers. My note about DSvsFile touches only DASDies (exactly
>harddisks) devices. Of course, if we mean magnetic tapes, 80-column
>decks, paper tapes, etc. we can say all data as file, dataset or, may
>be, set of data, as you want. The organization there is always
>sequential.
>
Yah. When Support told me, without qualification, that "SYSUT1 must
be a data set," and I countered with the passage from "Using Data
Sets", they immediately added qualifications.
>P.S. But, by the way, I've worked with direct-access magnetic tapes at
>80's (!). On soviet BESM-6 machines...
>
I knew someone who did that with a minicomputer. Preformat the volume
with short CK-type blocks alternating with long D-type blocks. On write,
be careful not to overwrite the next block (can't recover with erase gap
and retry.) On read, ignore residual noise.
And there was:
https://en.wikipedia.org/wiki/DECtape
-- gil
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