More GPIO pins: The GPIO header has grown to 40 pins, while retaining the same pinout for the first 26 pins as the Model A and B.
Micro SD: The old friction-fit SD card socket has been replaced with a much nicer push-push micro SD version.
Lower power consumption. By replacing linear regulators with switching ones we’ve reduced power consumption by between 0.5 W and 1 W.
Better audio. The audio circuit incorporates a dedicated low-noise power supply.
Smaller neater form factor. We’ve aligned the USB connector with the board edge, moved composite video onto the 3.5 mm jack, and added four squarely-placed mounting holes. Model A+ is approximately 2 cm shorter than the Model A.
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