diff --git a/expertWires.js b/expertWires.js
index bc41997..343f3d6 100644
--- a/expertWires.js
+++ b/expertWires.js
@@ -210,6 +210,10 @@ function setupParams(){
 			clockTriggers[value]=[clockTriggers[value],"setLow('rdy');"].join("");
 		} else if(name=="rdy1" && parseInt(value)!=NaN){
 			clockTriggers[value]=[clockTriggers[value],"setHigh('rdy');"].join("");
+		} else if(name=="time" && parseInt(value)!=NaN){
+			eventTime=value;
+		} else if(name=="databus" && parseInt(value)!=NaN){
+			clockTriggers[eventTime]=[clockTriggers[eventTime],"writeDataBus(0x"+value+");"].join("");
 		} else
 		// run a test program, and optionally check against a golden checksum
 		if(name=="steps" && parseInt(value)!=NaN){
diff --git a/macros.js b/macros.js
index 301b844..1dcc932 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(){