This design package includes reference materials for creating a USB - PS/2 combination mouse that auto-detects the interface and configures itself to operate on the appropriate bus. Documentation docs - Designing a low cost CY7C63723 combination mouse.pdf - application note for this design - schematic.pdf - mouse schematic Firmware Source Files src - chip.c - include file that defines CY7C63723 constants - combi.c - main source file - combi.hex - Intel hex file for programming a CY7C63723 microcontroller - combi.lst - output listing from c-compiler for use with the CYDB debugger - macros.h - defines macros used in combi.c - ps2defs.h - defines PS/2 interface constants - usb_desc.h - defines the USB descriptors - usbdefs.h - defines USB interface constants