(recode.info)CDC

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Charsets for CDC machines
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   What is now `recode' evolved out, through many transformations
really, from a set of programs which were originally written in
"COMPASS", Control Data Corporation's assembler, with bits in FORTRAN,
and later rewritten in CDC 6000 Pascal.  The CDC heritage shows by the
fact some old CDC charsets are still supported.

   The `recode' author used to be familiar with CDC Scope-NOS/BE and
Kronos-NOS, and many CDC formats.  Reading CDC tapes directly on other
machines is often a challenge, and `recode' does not always solve it.
It helps having tapes created in coded mode instead of binary mode, and
using `S' (Stranger) tapes instead of `I' (Internal) tapes.  ANSI
labels and multi-file tapes might be the source of trouble.  There are
ways to handle a few Cyber Record Manager formats, but some of them
might be quite difficult to decode properly after the transfer is done.

   The `recode' program is usable only for a small subset of NOS text
formats, and surely not with binary textual formats, like `UPDATE' or
`MODIFY' sources, for example.  `recode' is not especially suited for
reading 8/12 or 56/60 packing, yet this could easily arranged if there
was a demand for it.  It does not have the ability to translate Display
Code directly, as the ASCII conversion implied by tape drivers or FTP
does the initial approximation.  `recode' can decode 6/12 caret
notation over Display Code already mapped to ASCII.

Display Code

Control Data's Display Code

CDC-NOS

ASCII 6/12 from NOS

Bang-Bang

ASCII ``bang bang''