So, first of all, hello everyone! I'm Saturnyoshi, I have been doing hacking for years but only ever really done level and graphics hacks, until recently that is, I have been getting into ASM hacking for SMB1, and so far I have only done simple stuff like making coins kill you and porting a couple patches to Instectduel's SMB ROM with SMB2 items.
Now, what I want to do is add more graphics space and be able to switch the graphics on the fly, kind of like how Super Mario Unlimited has animated tiles and DahrkDaiz's old unfinished hack Mario Seasons switched graphics after 2 worlds.
So, what I have so far is a copy of SmbDis by doppelganger that has unused areas of code removed, I can insert it into the game just fine and it works properly. I read a little bit on how to expand Donkey Kong's PRG ROM, but as I'm still very new to ASM hacking I don't understand how it could be applied to SMB1.
Thanks in advance for any help!