OK, back to home !
Columns from left to right (1 to 30) :
Pins :
30/29/28/27/26/1/2/4/6/33/34/35/36/37/38/39/40/41/42/43/19/21/23/24/25/50/49/48/47/46
Rows, from bottom to top (1 to 7); 2 pins for each row:
Pins:
3/5///17/18///7/8//15/16///9/10///13/14///11/12
For example,
to put On the dot at Column17 and row 2:
pin 40 : +5V
pin 17 : 0V
one millisecond pulse
to put Off the same dot at C17 and row 2:
pin 18 : +5V
pin 40 : 0V
one millisecond pulse
Hope it helps.