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Chip for the QCX+ CW Transceiver kit, version 1.07. This is an ATmega328 chip. This chip is compatible with all versions of the QCX including all PCB revisions of the original classic QCX, the QCX+ and QCX-mini models.
Version history: please see http://www.qrp-labs.com/qcx/qcxfirmware.html