diff --git a/expertWires.js b/expertWires.js
index e79ed27..bd2607c 100644
--- a/expertWires.js
+++ b/expertWires.js
@@ -181,6 +181,12 @@ function setupParams(){
 			userResetLow=parseInt(value,16)%256;
 			userResetHigh=(parseInt(value,16)>>8)%256;
 		} else
+		// setup input pin events, breakpoints, watchpoints
+		if(name=="reset0" && parseInt(value)!=NaN){
+			clockTriggers[value]="setLow('res');";
+		} else if(name=="reset1" && parseInt(value)!=NaN){
+			clockTriggers[value]="setHigh('res');";
+		} else
 		// run a test program, and optionally check against a golden checksum
 		if(name=="steps" && parseInt(value)!=NaN){
 			userSteps=parseInt(value);
diff --git a/macros.js b/macros.js
index 14a6be1..341dcda 100644
--- a/macros.js
+++ b/macros.js
@@ -201,9 +201,13 @@ function step(){
 	chipStatus();
 }
 
+// triggers for breakpoints, watchpoints, input pin events
+clockTriggers={};
+
 // simulate a single clock phase with no update to graphics or trace
 function halfStep(){
 	var clk = isNodeHigh(nodenames['clk0']);
+	eval(clockTriggers[cycle]);  // usually undefined, no measurable performance loss
 	if (clk) {setLow('clk0'); handleBusRead(); } 
 	else {setHigh('clk0'); handleBusWrite();}
 }