Texas Instruments TUSB3210 the chip and TUSB2136 then the keyboard input source to the firmware and drivers source code.

Packet : 3970978tusb3210kbdfw.zip filelist
Keyboard Firmware Source Code/
Keyboard Firmware Source Code/delay.h
Keyboard Firmware Source Code/descrip.c
Keyboard Firmware Source Code/Keyboard.c
Keyboard Firmware Source Code/Keyboard.dtp
Keyboard Firmware Source Code/Keyboard.prj
Keyboard Firmware Source Code/KeyBoard.xcl
Keyboard Firmware Source Code/Release/
Keyboard Firmware Source Code/support.c
Keyboard Firmware Source Code/tusb2136.h
Keyboard Firmware Source Code/Types.h
Keyboard Firmware Source Code/usb.c
Keyboard Firmware Source Code/usb.h
Keyboard Firmware Source Code/usbinit.c
Keyboard Firmware Source Code/usbold.c
Keyboard Firmware Source Code/vidpid.c

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