diff --git a/macros.js b/macros.js
index 1dcc932..301b844 100644
--- a/macros.js
+++ b/macros.js
@@ -224,9 +224,9 @@ fetchTriggers={};
 // simulate a single clock phase with no update to graphics or trace
 function halfStep(){
 	var clk = isNodeHigh(nodenames['clk0']);
+	eval(clockTriggers[cycle]);
 	if (clk) {setLow('clk0'); handleBusRead(); } 
 	else {setHigh('clk0'); handleBusWrite();}
-	eval(clockTriggers[cycle]);
 }
 
 function handleBusRead(){