Converting CDC and Cray Files to IBM Formats

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Trans is a utility from the Cray machines that has been ported to run on the IBM machines. It knows about several forms of files on older machines and how to convert them for use on current machines.

In particular, text formats can be converted and numeric values can, in most cases, be converted to the IEEE format used on the IBM machines as 8 byte real and integer values. (Note that trans cannot deal with real or integer values that do not occupy full words on the older machines. It cannot deal, for example, with byte arrays or bytes packed into structures.) Simple programs can be written to then convert the data to other formats (such as 4 byte integers and/or reals) as needed.

In many cases trans can figure out what the format of an older file really is, but in some cases additional information must be provided. The table below is an attempt to specify what is needed for several older forms of files. If you have trouble, try a more complete specification of the format of the input file.

For more details on trans, see the trans man page.

Commom Uses of trans
Files Created On By To get to IBM format use
CDC 6600
or
CRAY 7600
most text editors trans -i infile,7600 -o outfile
trix red trans -i infile,7600,red -o outfile
Fortran Sequential Formatted write
(and namelist and list directed)
trans -i infile,7600 -o outfile
Fortran Sequential Unformatted write trans -i infile,7600 -o outfile
Fortran Direct access Formatted write trans -i infile,7600 -o outfile
Fortran Direct access Unformatted write trans -i infile,7600 -o outfile abs
Fortran two argument buffer out trans -i infile,7600 -o outfile
Fortran three argument buffer out trans -i infile,7600 -o outfile abs
Cray running
ltss, ctss, or nltss
text editors trans -i infile -o outfile
Fortran Sequential Formatted write
(and namelist and list directed)
trans -i infile -o outfile
Fortran Sequential Unformatted write trans -i infile -o outfile
Fortran Direct access Formatted write trans -i infile -o outfile
Fortran Direct access Unformatted write trans -i infile -o outfile
Fortran two arg buffer out to file connected for unformatted I/O trans -i infile -o outfile
Fortran two arg buffer out to file connected for formatted I/O trans -i infile -o outfile abs
Fortran three argument buffer out trans -i infile -o outfile abs
Cray running
Unicos
text editors (No translation needed)
Fortran Sequential Formatted write
(and namelist and list directed)
(No translation needed)
Fortran Sequential Unformatted write of numeric data trans -i infile -o outfile
Fortran Sequential Unformatted write of character data trans -i infile,cos -o outfile
Note: output file is text file as if it had been formatted write
Fortran Direct access Formatted write (No translation needed)
Fortran Direct access Unformatted write of numeric data trans -i infile -o outfile abs
Fortran Direct access Unformatted write of character data (No translation needed)
Fortran two arg buffer out to file connected for unformatted I/O trans -i infile -o outfile
Fortran two arg buffer out to file connected for formatted I/O trans -i infile -o outfile abs
Fortran three argument buffer out trans -i infile -o outfile abs

Once a file has been converted to IBM format, it can be moved via FTP to other platforms and FTP will take care of any additional conversion that is needed.


High Performance Computing at LLNL   Lawrence Livermore National Laboratory

Last modified October 8, 2007
UCRL-MI-126792 Rev. 1