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Differences to the Pro Micro
The USB port is now USB type C mid-mount, which is both through-hole and SMD mounted. It should be tougher and not as easily torn off as the USB micro B port on the original
The RAW pin on the
has been replaced with PB0.
The bootloader is DFU.
The silk-screened print on the board lists the actual ATmega32U4 port and bit numbers, not Arduino numbering.
Five additional I/O pins are exposed on the short edge. (PBO replaces the old RAW pin, for a total of six new I/O pins, making the total 24 out of the ATmega32U4's 26)
There are also holes for the USB port, for an external USB breakout board.
There is now an additional VBUS pin above pin B0, allowing for easier connection of external USB ports.
A physical reset button.
No indicator LEDs. The pins are instead available.
It has no voltage regulator and runs only on +5V.
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Manuform Hardware Kit