🚀 go-pugleaf

On  Tue, 26 May 92 06:18:21 ADT  Regis BOSSUT <RPARBS@FRFUPL11.BITNET>
writes:
> We don't have here the 3380 or 3880 manuals, so I have to rely on your
> knowledge. Can someone send me examples of channel programs reading
> multiple tracks at a time (with MT on) ?

If you're serious about writing complex channel programs, the manual
GA26-1661 is probably a good investment.  It contains sample channel
program logic for a number of situations.

> During my investigations, I incorrectly programmed the 'set sector'
> with a value of 0: RTMSF showed a disconnect time of 0 and large CN
> times, but VM did not disuade me to do that...
>
> My question might not be explicit enough. How many sectors are there
> on a track ? Are they equally spaced ? How can I calculate the sector
> number from the record number ?

Depends on the device type,  from GA26-1661 for 3380:

                  n-1
  S(n) = ( 1248 + SUM ( KL(i)+DL(i)+C ) ) / 224
                  i=1

Where  KL(i) = Key length + 12 rounded up to a multiple of 32
       DL(i) = data length + 12 rounded up to a multiple of 32
       C = 480 if KL(i) = 0
         = 704 if KL(i) != 0

The preamble to the set of formulas states that the formula is used for
record number n > 0.  If n=0 then S(n)=0.  Of course if the records are
all the same (data length and keylength constant) then the sum can
simplify to a multiplication.

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