These are utilities (possibly a jobstep) that act as filters between legacy format data and century format data. They act on a file or database level, not on a record-by-record basis.
![]() |
Forward Bridge (from legacy format to
century format. (May include record selection in addition to format conversion) Backward Bridge (from century format to legacy format) |
These are subroutines, called on demand: on an as-needed, record-by-record basis. Replace your I/O statements with calls to the bridges.
Tip: Turn the existing I/O statement into a comment and mark it with some unique tag to make it easy to burn the bridge when the time comes.
![]() |
Forward bridge (from Legacy format to century format) Backward bridge (from century format to legacy format) |