MIDIbox

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IF Your display is a HD44780 compatible, but has no datasheet available: You can try *tracing* the connector pinout by using HD44780 datasheet as a reference.

All pins of the connector expect V₀ ¹⁾, possible V_ee ²⁾ and possible Backlight power pins ³⁾ are directly connected to the HD44780 controller.

If You have the basic electronics knowledge:

You should be able to trace LCD pinout by watching the controller pin arrangement and using conductivity tester of your Multimeter to trace signals to the connector pins.