How do I get a text message when I open the door?
to display message text when opening door
You can do it with ASM. Setting $1426 through a block is all you really need to do. If you plan on using a lot of message boxes, you'll probably want to also use this patch.
As for making it like a door, you could just write your block like:
Code
Main: LDA $16 ; return if up wasn't pressed AND #$08 BEQ Return LDA #$01 ; value for $1426 STA $1426 Return: RTL
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