CA Dynam for VSE User Guide

Support for Read Backwards
The label processing area is always automatically available without your
intervention. Forced label tape support is controlled by the FLT option of the
DYNAM/T option record, and cannot be used for nonstandard or user label
processing. For more information, see the Programming Guide.
Note that RPG unlabeled tapes defined using the M operand are really
nonstandard labeled tapes and cannot be used with the FLT option.
Support for Read Backwards
If the DTF being opened has Read Backwards specified, the tape will be
positioned to the end of file before passing control to IBM. Only single volume
data sets are supported. Multifile single volume data sets are also supported.
ASCII Tape Support
If ASCII = YES is specified in the DTF, the VOL1/HDR1 will be rewritten by
DYNAM/T in ASCII before passing control to IBM. If an ASCII scratch tape is
used for output for an EBCDIC file, the VOL1/HDR1 will be rewritten by
DYNAM/T in EBCDIC.
ASCII input tapes will now be AVRed by DYNAM/T.
Using Other Software with CA Dynam/T
Sort and Utility Package Support
You may be using a utility package that provides tape/disk independence by
performing pre-OPEN checking of logical unit assignments to determine the
device type to be used. However, to fully implement CA Dynam/T's AVR
facility, you must do any one of the following:
• Eliminate pre-OPEN logical unit checking using CA SORT, r6.1 or greater.
• Replace permanent or temporary tape assignments used by these
packages with a special CA Dynam/T facility called TDYNASN.
Chapter 2: Maintaining Tape Files 2–73