Working with Backdrilling in Allegro PCB Designer: Best Practices
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Backdrill Legend Output
Tool Tip – To support the new enhanced backdrill functionality, a number of changes
were made to the backdrill legend format, which required an update to the NC Drill
Legend template file DEFAULT-*.DLT (new column definitions, backdrill notes, and so
on).
If you are using a local copy of the template file from a previous release, it is
recommended to retrieve an updated copy of the DLT files from the software hierarchy
to fully support the software enhancements for this release.
DLT File location: \SHARE\PCB\TEXT\NCLEGEND
