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Topics - Revility

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ROM Hacking Discussion / Zelda 2 spell editing
« on: February 01, 2018, 03:43:42 pm »
I have been tinkering with combining spells in Zelda 2 by mixing together the values starting at 0x000DCB.  What I was hoping to accomplish was combining reflect with shield spell and removing reflect magic by bumping up when you receive spell spell and Thunder in the towns.  In return the last ghost town would contain the final heart instead of spell. I had no issues bumping up when you learn spells or having a shield/reflect combo spell.

The problems I encountered when trying to edit the values for reflect, spell spell and thunder (20, 40, 80).  There is some math going on here when it comes to changing those.  In other words you can't just change the values from one to the other, glitches start to pop up.  Like wise if you go into spell routines and swap them around, glitches will also pop up.  It appears there is some math going on here that I am not of to achieve the desired results.  If I change reflect's 20 to 60 (20+40)spell spell works fine in it's place.  If I change spell spell's 40 into c0(40+80) Thunder will work in it's place... just a little wonky and thunder is also able to open the hidden door in New Kasuto.

Does anyone know how I could go about altering the last 3 spells?

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Personal Projects / Alien vs Predator Castlevania nes
« on: November 21, 2017, 11:02:23 pm »
Been slowly tinkering with turning Castlevania for nes into AVP.  Currently working on the enemies and then onto the level tiles. 

Right now it features Simon replaced with a predator, alien drones, dog aliens, flying chestbusters, flying hammerpedes, hammerpedes, Flying Queen (replaces giant bats), baby trilobites, acid spitting aliens (replace merman), spore clouds (replace ghost) and engineer guards (replace the knights).  Starting to replace the medusa head with a giant Trilobite.  I’m adding creatures from aliens, prometheus & looking at other sources for what could fit in.

Weapon wise the predator starts of with the spear and then upgrades to the razor whip.  Sub weapons include shoulder canon (replaces daggers) , smart disk, dissolving grenade (replaces holy water), and a tomahawk (might change this one to a shuriken idk).  Instead of Candles he breaks the black goo urns and alien eggs.  He collects skulls instead of hears.  The invulnerability jar has been replaced with a bio helmet icon... for his cloak.  The clock is replaced by an adrenaline needle, only thing I could really think of that made any sense.

There is no eta on when it will be done, or just how far it will go.

Any ideas or feedback is welcome.   

Tumblr link to pics:
http://jimkern.tumblr.com/post/167467006718/work-in-progress-shots-of-my-alien-vs-predator

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Newcomer's Board / Castlevania nes palette swapping
« on: October 25, 2017, 06:19:27 pm »
I did a forum search and seen a topic on palette swapping and read the links in the topic... it was very informative. Yet it is still greek to me.  I've had no issues figuring out how to replace sprites, tiles, or search for a pallet to replace colors in it.  However I am still fairly new to hex editing so understanding how to change the pallet a sprite uses to another is a bit confusing.

I am not sure where to find the info in a hex editor for which sprite uses what palette and also figure out how exactly to find what number a sprite is in order to begin the process of finding that info in the rom.

Any help would be greatly appreciated.

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