Wiring Diagram for Dualhead LCD display 5123891093 P7<----------------->DB7 on both LCDs Pin 14 P6<----------------->DB6 on both LCDs Pin 13 P5<----------------->DB5 on both LCDs Pin 12 P4<----------------->DB4 on both LCDs Pin 11 /DB3 on both LCDs Pin 10 To 5v GND---DB2 on both LCDs Pin 9 \-DB1 on both LCDs Pin 8 \DB0 on both LCDs Pin 7 P3<----------------->RS on both LCDs Pin 4 P2<----------------->R/W on both LCDs Pin 5 P1<----------------->E on LCD 1 pin 6 P0<----------------->E on LCD 0 pin 6 Contrast Pin 3 To 5v GND Vdd Pin 2 To +5V Vss Pin 1 ** IMPORTANT! ** Pin 2 should also go to the Vss connector on the Basic Stamp. Otherwise NONE of the LCD commands will work as the LCD will not have a refrence ground for the I/O pins voltage state.