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You can use the V6 engine on a LIBNAME statement in SAS 8 or SAS 9 and
access a Version 6 catalog but it will be read only. This means you can
run your SAS/AF or SAS/FSP applications without having to convert them.
If you want to make any changes to your application, you will need to
convert the application to SAS 8 or SAS 9 format.

We recommend that you use the CPORT and CIMPORT procedures to convert a
Version 6 SAS/AF or SAS/FSP application to SAS 8 or SAS 9. This produces
a SAS 8 or SAS 9 catalog and all the entries in the resulting catalog
are in SAS 8 or SAS 9 format.

You can be in SAS 8 or SAS 9 and do the entire CPORT/CIMPORT process
there unless you are running SAS under AIX. See SAS Note  #000069  for
more information.

To convert Version 6 catalogs to SAS 8 or SAS 9 format, use the V6
engine when you refer to your Version 6 library on the CPORT statement.
You would use the V8/V9 engine when you refer to your new SAS 8 or SAS 9
library on the CIMPORT statement.

For example: the following statements are submitted in SAS 8:

   /* make library assignments for the Version 6 library, V6LIB */
   /* and the SAS 8 library, V8LIB.                             */
   libname v6lib v6 'path-to-v6-library';
   libname v8lib v8 'path-to-v8-library';

   /* Create a transport file for the Version 6 catalog, V6LIB.MYCAT.*/
   proc cport cat=v6lib.mycat file='myxpt.xpt';
   run;

   /* Import the newly created transport file to produce V8LIB.MYCAT.*/
   proc cimport cat=v8lib.mycat infile='myxpt.xpt';
   run;

It is possible to use PROC COPY to produce a SAS 8 or SAS 9 catalog from
a Version 6 catalog. But the entries in the new SAS 8 or SAS 9 catalog
are still in Version 6 format. As the entries are updated, they will be
changed to SAS 8 or SAS 9 format but those entries that are never
updated are never changed. Therefore, we recommend that you use PROC
CPORT and PROC CIMPORT to convert catalogs from Version 6 to SAS 8 or
SAS 9 instead of PROC COPY.

A good paper on the topic of V6 to SAS 8 compatibility is James Holman's
SUGI23 paper entitled "SAS Data Libraries: V6 to V7 Compatibility (or,
will Version 7 be able to access my Version 6 files?  ". A customer can
download this paper from the web by using the URL below:

   http://ftp.sas.com/techsup/download/v7papers/DataLibraries.pdf

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