If you are lucky there might be a sticker with RM68090 or HX8347-G
But normally these Shields are a lottery. You don't know which controller is mounted until you run a suitable library and see what is reported by tft.readID()
Sometimes the pcb says 8347 or 68090 but this does not mean that it is true.
However these Shields are "readable". Which means that you can discover which controller ID is mounted.
Most Mega2560 Shields (with 2x18 header) are write-only. There is no way to identify the controller.
Is this right way to connect screen to arduino mega?:
SCREEN D0 -> MEGA D22
SCREEN D1 -> MEGA D23
SCREEN D2 -> MEGA D24
SCREEN D3 -> MEGA D25
SCREEN D4 -> MEGA D26
SCREEN D5 -> MEGA D27
SCREEN D6 -> MEGA D28
SCREEN D7 -> MEGA D29
SCREEN LCD CS -> MEGA A3
SCREEN LCD RS -> MEGA A2
SCREEN LCD WR -> MEGA A1
SCREEN LCD RST -> MEGA RESET
SCREEN SD CS -> MEGA D10
Oh, and we are going to use both arduino mega and arduino nano on our project.
I read datasheet of the screen and understood that I can connect it to Arduino Mega just like I wrote, but I´m thinking, will my sd-card work with that SCREEN SD CS -> MEGA D10 or do I have to get more pins from SD-pins to Arduino pins?