Jmgelba,
Just a suggestion, try using the above Newheaven_4x40_Text Code.txt , INIT_LCD rutine and its sub’s, EEPRON, and E1 variable. This routine is for a duel ST7066U so you should only use Command1 in INIT_LCD. After initializing the LCD, all PBP commands should work. As stated in above post’s Vo adjustment must be made to find the sweet spot to display. Good luck!

Wayne