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Possible Determining Factor in Mithril Weapons

Discussion about this classic Genesis/Mega Drive game.

Possible Determining Factor in Mithril Weapons

Postby Hideaki » Sun Dec 16 2018 5:59pm

I never used to have problems getting the weapons I wanted for each character. I would just change things up a bit, and a different weapon would be offered.

Now, using an emulator where I can't use the game's internal save feature, the choice of weapons is limited to two per fighting type, no matter what factors I change up. So I suspect that the *save place* plays a role in what weapons are offered.

Could anyone offer any experiences that would show this isn't the case? Or some to substantiate it?
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Re: Possible Determining Factor in Mithril Weapons

Postby Jonesy_Pants » Mon Dec 17 2018 8:32am

I thought it was down to steps? i've done some testing with save states and would change the number of steps taken before talking to the blacksmith until i go the desired result.
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Re: Possible Determining Factor in Mithril Weapons

Postby Kilieni » Mon Dec 17 2018 3:15pm

Taking steps doesn't alter the RNG. According to DarkKobold's TAS notes "The RNG of SF2 is a 16-bit sequential loop. It can only change for one of three conditions: A call for a random value, a text box pause, or sitting in a menu." http://tasvideos.org/2566S.html

Basically you should be able to alter your RNG just by waiting on the text box while the Dwarf Blacksmith is talking to you. Every frame you sit there the RNG advances. Also the moving dwarf on the way to the blacksmith calls a random value when he moves to determine direction. And of course if you just open the menu with A or C. Every frame you sit there advances RNG too.
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Re: Possible Determining Factor in Mithril Weapons

Postby Hideaki » Wed Dec 26 2018 2:53pm

Interesting. So at what point is a value taken from the moving dwarf? When you enter the room? Leave the room? When you're taking to the blacksmith dwarf and can't even see the moving dwarf?

Any of my tests so far since reading this post to try to change the RNG so I get weapons I have been completely unsuccessful.
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Re: Possible Determining Factor in Mithril Weapons

Postby Kilieni » Thu Dec 27 2018 10:04am

Whenever a moving character is loaded, and certainly when they're on screen, the game will call a random value just before they move to determine direction. Every time it does this, the RNG advances.
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