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The recode reference manual

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10. Charsets for CDC machines

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.

10.1 Control Data's Display Code  
10.2 ASCII 6/12 from NOS  
10.3 ASCII "bang bang"  


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