Not sure if the OP's still active, but editing Nintendo Presents more thoroughly, such as adding like a bigger splash screen that's say 256-color/Mode 7 for instance, a larger Nintendo logo with HDMA like that old ass patch that was used for TSRPR, or a little press start button prompt
like in The Mario, etc... Would require editing game mode 00 directly using a patch using ASM.
But for simple edits of the Nintendo Presents graphic, which should be good enough for most people, it would only require YY-CHR and GFX00.bin.
im gay and a lion. I AM VERY POOR PROGRAMMER !!!
pixel art no hoper. transcriptions on a hot tin ear.