Barcode scanner support over USB. A USB scanner set to serial (COM) mode is now recognised, and its scans arrive exactly as if they had come from the existing RS-232 scanner port — so all the existing barcode handling, including macros, the character filtering and entry into fields, works unchanged.

Three things had to be enabled or corrected to get there. The USB serial device class was not built into the controller's USB software at all, so the scanner was seen but nothing could claim it. A header the application needed was not being copied out of the USB library. And the buffer that receives scanner characters was only created when no PC was connected to the diagnostic port, so it was missing on any machine with a debugger attached.