From 7339615890d10732d015a74ddd36ce7a93aaad74 Mon Sep 17 00:00:00 2001
From: zeromus <zeromus@zeromus.org>
Date: Sat, 17 Nov 2012 08:16:02 +0000
Subject: [PATCH] nes-change memory initialization pattern; fixes Huang Di.
 Doesnt seem to break any of the other known memory-initialization-dependent
 cases

---
 BizHawk.Emulation/Consoles/Nintendo/NES/Core.cs | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/BizHawk.Emulation/Consoles/Nintendo/NES/Core.cs b/BizHawk.Emulation/Consoles/Nintendo/NES/Core.cs
index 40da6a4736..773255a299 100644
--- a/BizHawk.Emulation/Consoles/Nintendo/NES/Core.cs
+++ b/BizHawk.Emulation/Consoles/Nintendo/NES/Core.cs
@@ -190,11 +190,9 @@ namespace BizHawk.Emulation.Consoles.Nintendo
 					goto case "NES-NTSC";
 			}
 
-			//fceux uses this technique, which presumably tricks some games into thinking the memory is randomized
-			for (int i = 0; i < 0x800; i++)
-			{
-				if ((i & 4) != 0) ram[i] = 0xFF; else ram[i] = 0x00;
-			}
+			//check fceux's PowerNES function for more information:
+			//relevant games: Cybernoid; Minna no Taabou no Nakayoshi Daisakusen; Huang Di; and maybe mechanized attack
+			for(int i=0;i<0x800;i++) if((i&1)!=0) ram[i] = 0xAA; else ram[i] = 0x55;
 
 			SetupMemoryDomains();