As the adapter should be of minimal size the power pins of the chip are
not brought to the perimeter ono to one. Instead there are
groups of power/ground pins on the board. This does not limit their
usuability in any ways. It is simply a deviation from the old design for
100 pins, where all pins were made available at the external connector.Those pins that are labelled with pure numbers are the pins labelled "I/Ox" (with x being a number) in the data sheet of the chip.
Pins with a name consiting of letters represent the function that they
serve. The naming is identical to the convention in the original data sheet
of the chip.