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games/snes: minor oam bugs

--- a/sys/src/games/snes/mem.c

+++ b/sys/src/games/snes/mem.c

@@ -231,7 +231,7 @@

 		oamaddr = (reg[0x2103] & 1) << 9 | v << 1;

 		break;

 	case 0x2103:

-		oamaddr = (v & 1) << 9 | reg[0x2102];

+		oamaddr = (v & 1) << 9 | reg[0x2102] << 1;

 		break;

 	case 0x2104:

 		if((oamaddr & 1) == 0)

--- a/sys/src/games/snes/ppu.c

+++ b/sys/src/games/snes/ppu.c

@@ -877,7 +877,8 @@

 			reg[RDNMI] |= VBLANK;

 			if((reg[NMITIMEN] & VBLANK) != 0)

 				nmi = 2;

-			oamaddr = reg[0x2102] << 1 | (reg[0x2103] & 1) << 9;

+			if((reg[INIDISP] & 0x80) == 0)

+				oamaddr = reg[0x2102] << 1 | (reg[0x2103] & 1) << 9;

 			if((reg[NMITIMEN] & AUTOJOY) != 0){

 				memwrite(0x4016, 1);

 				memwrite(0x4016, 0);

-- 

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