diff --git a/modules/pdp11/lib/cpustate.js b/modules/pdp11/lib/cpustate.js
index aa5c933b5..f60c54c1b 100644
--- a/modules/pdp11/lib/cpustate.js
+++ b/modules/pdp11/lib/cpustate.js
@@ -2073,21 +2073,25 @@ CPUStatePDP11.prototype.stepCPU = function(nMinCycles)
      * so stopCPU() would have no effect as far as the Debugger is concerned.
      */
     this.flags.complete = true;
+    this.flags.debugCheck = (DEBUGGER && this.dbg && this.dbg.checksEnabled());
 
     /*
-     * fDebugCheck is true if we need to "check" every instruction with the Debugger.
+     * nDebugCheck is 1 if we want to "check" every instruction with the Debugger, and -1 if we only
+     * want to check the first instruction.
      */
-    var fDebugCheck = this.flags.debugCheck = (DEBUGGER && this.dbg && this.dbg.checksEnabled());
+    var nDebugCheck = this.flags.debugCheck? 1 : -1;
 
     /*
-     * nDebugState is checked only when fDebugCheck is true, and its sole purpose is to tell the first call
+     * nDebugState is checked only when nDebugCheck is set, and its sole purpose is to tell the first call
      * to checkInstruction() that it can skip breakpoint checks, and that will be true ONLY when fStarting is
      * true OR nMinCycles is zero (the latter means the Debugger is single-stepping).
-     *
+     */
+    var nDebugState = (!nMinCycles)? -1 : (this.flags.starting? 0 : 1);
+
+    /*
      * Once we snap fStarting, we clear it, because technically, we've moved beyond "starting" and have
      * officially "started" now.
      */
-    var nDebugState = (!nMinCycles)? -1 : (this.flags.starting? 0 : 1);
     this.flags.starting = false;
 
     /*
@@ -2098,12 +2102,13 @@ CPUStatePDP11.prototype.stepCPU = function(nMinCycles)
     this.nBurstCycles = this.nStepCycles = nMinCycles;
 
     do {
-        if (DEBUGGER && fDebugCheck) {
+        if (DEBUGGER && nDebugCheck) {
             if (this.dbg.checkInstruction(this.getPC(), nDebugState)) {
                 this.stopCPU();
                 break;
             }
             nDebugState = 1;
+            nDebugCheck++;
         }
 
         if (this.opFlags) {
diff --git a/versions/pdpjs/1.30.1/pdp11-dbg.js b/versions/pdpjs/1.30.1/pdp11-dbg.js
index a8407340d..576168686 100644
--- a/versions/pdpjs/1.30.1/pdp11-dbg.js
+++ b/versions/pdpjs/1.30.1/pdp11-dbg.js
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+function r(a,b,c,d){this.type=a;b||(b={id:"",name:""});this.id=b.id||"";this.name=b.name;this.Yb=b.comment;this.uc=b;b=this.id.indexOf(".");0>b?this.$a=this.id:(this.Sa=this.id.substr(0,b),this.$a=this.id.substr(b+1));this[a]=c;this.v={ready:!1,Ja:!1,Kb:!1,ja:!1,error:!1};this.Cb=null;this.v.error=!1;this.I={};this.i=null;this.na=d||0;t.push(this)}var Xa=void 0,db={};
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+var sb="undefined"!==typeof ArrayBuffer,tb={cpu:1,trap:16,bus:64,memory:128,device:256,keyboard:65536,key:131072,disk:2097152,serial:8388608,speaker:33554432,computer:67108864,log:268435456,warn:536870912,buffer:1073741824,halt:-2147483648};function ub(a){r.call(this,"Panel",a,ub);this.f=0;this.v.Wb=!0}u(ub);k=ub.prototype;
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@@ -74,20 +74,20 @@ k.xd=function(a){var b=this.b;1170>b.fb&&(a&=-49);b.Pa!=a&&(b.Pa=a,a&16?(b.rb=41
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