From 55ea9a80b19c24851131d8f78d163b3e20920049 Mon Sep 17 00:00:00 2001
From: aiju <devnull@localhost>
Date: Sat, 15 Mar 2014 10:06:18 +0100
Subject: games/snes: fix flickering sprite bug

---
 sys/src/games/snes/mem.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

(limited to 'sys/src')

diff --git a/sys/src/games/snes/mem.c b/sys/src/games/snes/mem.c
index 6b6fb0286..9fd17aa86 100644
--- a/sys/src/games/snes/mem.c
+++ b/sys/src/games/snes/mem.c
@@ -203,12 +203,10 @@ regwrite(u16int p, u8int v)
 	}
 	switch(p){
 	case 0x2102:
-		oamaddr &= 0x200;
-		oamaddr |= v << 1;
+		oamaddr = (reg[0x2103] & 1) << 9 | v << 1;
 		break;
 	case 0x2103:
-		oamaddr &= 0x1fe;
-		oamaddr |= (v & 1) << 9;
+		oamaddr = (v & 1) << 9 | reg[0x2102];
 		break;
 	case 0x2104:
 		if((oamaddr & 1) == 0)
-- 
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