1. Sequential files  were less common once line files could support long lines.2. This allows for rapid sequential file  reads and writes. 3. A typical statement in BASIC to write to a sequential file  would be as follows: 4. IFASMFDP can also be used to split existing SMF sequential files  and copy them to other files. 5. Wherever possible, the software operated in FORTRAN processing sequential files  to enhance portability among operating systems. 6. Insertions can be very slow in a sorted sequential file  because room for the inserted record must be made. 7. Sequential files  are generally only readable sequentially from start to end, or written by appending to the end.8. TYPE = SEQWL "') are similar to Sequential Files , except that their line numbers were explicitly stored. 9. Partitioned datasets ( PDS ) were sequential datasets subdivided into " members " that could be processed as sequential files  in their own right. 10. Even something as simple as writing a " sequential file  " is coded differently e . g . in Z / OS than in Z / VSE.