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games/snes: silly bug

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

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

@@ -597,10 +597,11 @@

 	}else

 		if((rA & v) == 0)

 			rP |= FLAGZ;

+	io();

 	if(set)

-		rmw(a, v, v | rA);

+		memw816(a, v | rA);

 	else

-		rmw(a, v, v & ~rA);

+		memw816(a, v & ~rA);

 }

 enum { COP = 0, BRK = 1, NMI = 3, IRQ = 5 };