Although the ISAM and ISAM-A files have different structures, you can convert the data by dumping the ISAM 1.x file to a sequential file using ISMDMP, and then creating your ISAM-A file and loading it from that sequential file using ISMUTL.

The AMOS and A-Shell versions of ISAM-A files are more similar, but still are not binary compatible so you have to perform some kind of conversion. The most straightforward is to dump the file on one system with ISMUTL, transfer the sequential file to the other system, then reload it using ISMUTL. If you have a lot of huge files to transfer, it may be more efficient to use the A-Shell ISMCVT utility (discussed in a separate topic later on in this document.)