Quote Originally Posted by flotulopex
I'm reading the ST7036 driver's data sheet and I can't find where the operation voltage should be set.

The difference I see between the 3.3V and 5V configuration are the "Voltage Booster" and "Voltage Follower". Okay, but what would be the settings?

What is the "Bias" setting for?
The registers where you can see the differences are where the values are set. The values you need are shown in Binary. just convert that to HEX and you have your commands eg Power command register for 5v working is shown as 0101 0010 which is $52 so

LCDout $FE, $52 should do the trick.

You mey not even need to convert it.... you may be able to send

LCDout $FE, %01010010.

I dont know the exact purpose of the Bias setting but as they give you the required values that is what you should use.