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header pin numbering



I�ve seen boards with 40 pin headers like the one on the
TransWarpGS marked on the board with any of these numbering
schemes. Any opinions as to which is preferable in this case?


20 19 18 17 16 15 14 13 12 11 10  9  8  7  6  5  4  3  2  1

21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40





20 19 18 17 16 15 14 13 12 11 10 9  8  7  6  5  4  3  2  1

40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21





39 37 35 33 31 29 27 25 23 21 19 17 15 13 11  9  7  5  3  1

40 38 36 34 32 30 28 26 24 22 20 18 16 14 12 10  8  6  4  2