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A PICAXE chip is a standard Microchip PIC microcontroller that has been pre-programmed with the PICAXE bootstrap firmware code. The bootstrap code enables the PICAXE microcontroller to be re-programmed 'in position' directly via a simple 'three wire' download cable connection. This eliminates the need for an (expensive) conventional PIC programmer, making the whole download programming system a low-cost USB cable. The same software and download cable is used for all PICAXE chip sizes and project boards.