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Introduction
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The current HamHUD II hardware is based around the Microchip PIC18F252 running at
40MHz. First and second generation HamHUD II’s are capable of this firmware with a
replacement of the original PIC16F876 and 20MHz crystal with the PIC18F252 and a
10MHz crystal (clock speed is internally multiplied by 4). Both items are drop-in
replacements and do not require any modifications to the PCB itself. The PIC18F252
does require that it be initially burned with a programmer such as the older Warp13 or
newer Olimex MPLAB compatible programmer.