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games/c64: writes to I/O area do not affect underlying memory (documentation lied)

--- a/sys/src/games/c64/mem.c

+++ b/sys/src/games/c64/mem.c

@@ -280,8 +280,11 @@

 void

 memwrite(u16int a, u8int v)

 {

-	if(a >> 12 == 13 && !((pla & (HIRAM|LORAM)) == 0 || pla == 1 || (pla & CHAREN) == 0 && (pla & (EXROM|GAME)) != EXROM))

+	if(a >> 12 == 13 && !((pla & (HIRAM|LORAM)) == 0 || pla == 1 || (pla & CHAREN) == 0 && (pla & (EXROM|GAME)) != EXROM)){

 		miowrite(a & 0xfff, v);

+		io();

+		return;

+	}

 	ram[a] = v;

 	if(a == 1)

 		pla = pla & ~7 | v & 7;