From 82834a17533c6dcd8008d459e6eee44ffec674f6 Mon Sep 17 00:00:00 2001
From: Sour <mesenemu@gmail.com>
Date: Sun, 10 Mar 2019 23:18:47 -0400
Subject: [PATCH] PPU: MSB of CGRAM entries is 7 bits only

---
 Core/Ppu.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/Core/Ppu.cpp b/Core/Ppu.cpp
index 2309119..95cc9c3 100644
--- a/Core/Ppu.cpp
+++ b/Core/Ppu.cpp
@@ -1479,7 +1479,12 @@ void Ppu::Write(uint32_t addr, uint8_t value)
 			//CGRAM Data write (CGDATA)
 			_console->ProcessPpuWrite(_cgramAddress, value, SnesMemoryType::CGRam);
 
-			_cgram[_cgramAddress] = value;
+			if(_cgramAddress & 0x01) {
+				//MSB ignores the 7th bit (colors are 15-bit only)
+				_cgram[_cgramAddress] = value & 0x7F;
+			} else {
+				_cgram[_cgramAddress] = value;
+			}
 			_cgramAddress = (_cgramAddress + 1) & (Ppu::CgRamSize - 1);
 			break;