pinout
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|            |
  1Y2| 1        20|  1Y1
  1Y3| 2        19|   1A
  1Y4| 3        18|/1OE1
  GND| 4        17|/1OE2
  GND| 5        16|  VCC
  GND| 6        15|  VCC
  GND| 7        14|   2A
  2Y1| 8        13|/2OE1
  2Y2| 9        12|/2OE2
  2Y3|10        11|  2Y4
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