DRC and Constraint Manager: Accuracy in Design Rule Checks (DRC) is the backbone of PCB design. SPB 16.5 updates consistently tweaked the Constraint Manager to ensure that high-speed rules, such as differential pair phase tuning and length matching, remained precise across different design iterations. How to Check Your Current Version
The PCB Editor, based on the Allegro engine, received the most substantial architectural changes in the SPB 16.5 update cycle. OrCAD 16.5 Hotfix SPB 16.5 Updates