diff --git a/apps/pdp10/diags/klad/dakaa/MYDAKAA.MAC.txt b/apps/pdp10/diags/klad/dakaa/MYDAKAA.MAC.txt
index 818244639..67c484274 100644
--- a/apps/pdp10/diags/klad/dakaa/MYDAKAA.MAC.txt
+++ b/apps/pdp10/diags/klad/dakaa/MYDAKAA.MAC.txt
@@ -12,17 +12,16 @@ DEFINE	STOP	(A)<
 
 SUBTTL	DIAGNOSTIC SECTION
 
-START:
-;	SETZM	USER#		;CLEAR USER CONTROL WORD
-;	JSP	0,.+1		;GET FLAGS
-;	TLNE	USERF		;IN USER MODE?
-;	SETOM	USER		;YES, SET USER CONTROL WORD
-;	SKIPN	MONFLG		;SPECIAL USER MODE?
-;	SETZM	USER		;YES, CLEAR USER CONTROL WORD
-;	SKIPN	USER
-;	JRST	STARTA
-;	SKIPL	MONCTL
-;	TTCALL	3,PGMNAM		;MENTION OUR NAME
+START:	;SETZM	USER#		;CLEAR USER CONTROL WORD
+	;JSP	0,.+1		;GET FLAGS
+	;TLNE	USERF		;IN USER MODE?
+	;SETOM	USER		;YES, SET USER CONTROL WORD
+	;SKIPN	MONFLG		;SPECIAL USER MODE?
+	;SETZM	USER		;YES, CLEAR USER CONTROL WORD
+	;SKIPN	USER
+	;JRST	STARTA
+	;SKIPL	MONCTL
+	;TTCALL	3,PGMNAM		;MENTION OUR NAME
 	JRST	STARTA
 
 PGMNAM:	ASCIZ/
diff --git a/apps/pdp10/diags/klad/dakad/MYDAKAD.MAC.txt b/apps/pdp10/diags/klad/dakad/MYDAKAD.MAC.txt
index f408ca60b..00d53d9a3 100644
--- a/apps/pdp10/diags/klad/dakad/MYDAKAD.MAC.txt
+++ b/apps/pdp10/diags/klad/dakad/MYDAKAD.MAC.txt
@@ -35,17 +35,16 @@ DEFINE	SFLAG	(A)<
 	JRST	2,.+1(1)	;SET A FLAG>
 SUBTTL	DIAGNOSTIC SECTION
 
-START:
-;	SETZM	USER#		;CLEAR USER CONTROL WORD
-;	JSP	0,.+1		;GET FLAGS
-;	TLNE	USERF		;IN USER MODE?
-;	SETOM	USER		;YES, SET USER CONTROL WORD
-;	SKIPN	MONFLG		;SPECIAL USER MODE?
-;	SETZM	USER		;YES, CLEAR USER CONTROL WORD
-;	SKIPN	USER
-;	JRST	C00
-;	SKIPL	MONCTL
-;	TTCALL	3,PGMNAM	;MENTION OUR NAME
+START:	;SETZM	USER#		;CLEAR USER CONTROL WORD
+	;JSP	0,.+1		;GET FLAGS
+	;TLNE	USERF		;IN USER MODE?
+	;SETOM	USER		;YES, SET USER CONTROL WORD
+	;SKIPN	MONFLG		;SPECIAL USER MODE?
+	;SETZM	USER		;YES, CLEAR USER CONTROL WORD
+	;SKIPN	USER
+	;JRST	C00
+	;SKIPL	MONCTL
+	;TTCALL	3,PGMNAM	;MENTION OUR NAME
 	JRST	STARTA
 
 PGMNAM:	ASCIZ/
diff --git a/apps/pdp10/tests/macro10/README.md b/apps/pdp10/tests/macro10/README.md
index 2af482960..cd9e65d9e 100644
--- a/apps/pdp10/tests/macro10/README.md
+++ b/apps/pdp10/tests/macro10/README.md
@@ -7,7 +7,7 @@ machines:
     type: pdp10
     config: /devices/pdp10/machine/ka10/test/debugger/machine.xml
     debugger: true
-    commands: a 100 /apps/pdp10/tests/macro10/LITNEST.MAC
+    commands: a 100 /apps/pdp10/tests/macro10/TEXT.MAC
 ---
 
 PDPjs MACRO-10 Mini-Assembler Tests
diff --git a/modules/pdp10/lib/debugger.js b/modules/pdp10/lib/debugger.js
index 0a5b13acb..9fe9155d6 100644
--- a/modules/pdp10/lib/debugger.js
+++ b/modules/pdp10/lib/debugger.js
@@ -1703,6 +1703,14 @@ class DebuggerPDP10 extends Debugger {
                 }
                 if (opCode >= 0) break;
             }
+            /*
+             * MACRO-10 also allows instructions to be assembled without an opcode (ie, just an address reference),
+             * so we'll give that a try next.
+             */
+            if (opCode < 0) {
+                sOperands = sOpcode + sOperands;
+                opCode = 0;
+            }
         }
 
         if (opCode >= 0) {
diff --git a/modules/pdp10/lib/macro10.js b/modules/pdp10/lib/macro10.js
index 81d7aef2c..1a1008001 100644
--- a/modules/pdp10/lib/macro10.js
+++ b/modules/pdp10/lib/macro10.js
@@ -230,7 +230,17 @@ class Macro10 {
         this.nMacroDef = 0;             // the active macro definition state
         this.sMacroDef = null;          // the active macro definition name
         this.chMacroOpen = this.chMacroClose = '';
-        this.reLine = /\s*([A-Z$%.?][0-9A-Z$%.]*:|)\s*([A-Z$%.][0-9A-Z$%.]*|)\s*([^;]+|)(;?[\s\S]*)/i;
+
+        /*
+         * This regular expression breaks each MACRO-10 line into the following elements:
+         *
+         *      [1]: label (with trailing semicolon), if any
+         *      [2]: operator (eg, opcode mnemonic or pseudo-op), if any
+         *      [3]: operator/operand whitespace separator, if any
+         *      [4]: operand(s), if any
+         *      [5]: comment, if any
+         */
+        this.reLine = /^\s*([A-Z$%.?][0-9A-Z$%.]*:|)\s*([A-Z$%.][0-9A-Z$%.]*|)(\s*)([^;]+|)(;?[\s\S]*)/i;
 
         this.macroCall = null;          // the active macro being called, if any
 
@@ -448,11 +458,11 @@ class Macro10 {
         }
 
         var fParse = true;
-        var sLabel, sOperator = "", sOperands, sRemainder;
+        var sLabel, sOperator = "", sSeparator, sOperands, sRemainder;
 
         while (fParse) {
             var matchLine = sLine.match(this.reLine);
-            if (!matchLine || matchLine[4] && matchLine[4].slice(0, 1) != ';') {
+            if (!matchLine || matchLine[5] && matchLine[5].slice(0, 1) != ';') {
                 this.error("failed to parse line: " + sLine);
                 return false;
             }
@@ -466,7 +476,7 @@ class Macro10 {
                     var sParm = aParms[iParm];
                     var sReplace = aValues[iParm] || aDefaults[iParm] || "";
                     var iSearch = 0;
-                    var iLimit = sLine.length - matchLine[4].length;    // set the limit at the start of the comment, if any
+                    var iLimit = sLine.length - matchLine[5].length;    // set the limit at the start of the comment, if any
                     while (iSearch < iLimit) {
                         var iMatch = sLine.indexOf(sParm, iSearch);
                         if (iMatch < 0) break;
@@ -490,8 +500,9 @@ class Macro10 {
         }
 
         sLabel = matchLine[1];
-        sOperands = matchLine[3].trim();
-        sRemainder = matchLine[3] + matchLine[4];
+        sSeparator = matchLine[3];
+        sOperands = matchLine[4].trim();
+        sRemainder = matchLine[4] + matchLine[5];
 
         if (sLabel) {
             sLabel = sLabel.slice(0, -1);
@@ -572,7 +583,7 @@ class Macro10 {
                 break;
 
             default:
-                this.addWord(sOperator, sOperands);
+                this.addWord(sOperator, sSeparator, sOperands);
                 break;
             }
         }
@@ -1256,25 +1267,21 @@ class Macro10 {
     }
 
     /**
-     * addWord(sOperator, sOperands)
+     * addWord(sOperator, sSeparator, sOperands)
      *
      * @this {Macro10}
      * @param {string} sOperator
+     * @param {string} sSeparator
      * @param {string} sOperands
      */
-    addWord(sOperator, sOperands)
+    addWord(sOperator, sSeparator, sOperands)
     {
         var w = -1;
-        var sExp = (sOperator + ' ' + sOperands).trim();
+
+        var sExp = (sOperator + sSeparator + sOperands).trim();
 
         if (sOperands.indexOf(",,") < 0) {
             w = this.dbg.parseInstruction(sOperator, sOperands, this.nLocation, true);
-            if (w < 0) {
-                /*
-                 * MACRO-10 also allows instructions to be assembled without an opcode (ie, just an address reference).
-                 */
-                w = this.dbg.parseInstruction("", sExp, this.nLocation, true);
-            }
         }
 
         if (w < 0) w = this.parseExpression(sExp, true);
diff --git a/versions/pdpjs/1.34.3/pdp10-dbg.js b/versions/pdpjs/1.34.3/pdp10-dbg.js
index d7cfabcc9..1b5ec4953 100644
--- a/versions/pdpjs/1.34.3/pdp10-dbg.js
+++ b/versions/pdpjs/1.34.3/pdp10-dbg.js
@@ -55,19 +55,19 @@ function tb(a,b){var c=v;b=w(b.parentNode,c+"-control");for(var d=0;d<b.length;d
 function w(a,b,c){c&&(b+="-"+c+"-object");if(a.getElementsByClassName)return a.getElementsByClassName(b);var d;c=[];a=a.getElementsByTagName("*");var e=new RegExp("(^| )"+b+"( |$)");b=0;for(d=a.length;b<d;b++)e.test(a[b].className)&&c.push(a[b]);return c}
 function ub(a){for(var b=!0,c=vb[a];c&&c.length;){var d=c.splice(0,1)[0],e=d[0],f=null;0<=wb.indexOf(e)&&(f=function(){return function(){ub(a)}}());var g=xb[e];if(g)if(!f)b=g(d[1],d[2],d[3]);else{if(!g(f,d[1],d[2],d[3]))break}else{var b=!1,h=sb(d[1],a);if(h)if(g=yb[e])b=g(h,d[2],d[3]);else{var k=h.exports;if(k&&(g=k[e]))if(b=!0,!f)b=g.call(h,d[2],d[3]);else if(!g.call(h,f,d[2],d[3]))break}}if(!b){q("Script error: "+e+(g?" failed":" unrecognized"));break}}c&&!c.length&&delete vb[a];return b}l=r.prototype;
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+l.pa=function(a,b,c){switch(b){case "clear":return this.J[b]||(this.J[b]=c,c.onclick=function(a){return function(){a.J.print&&(a.J.print.value="")}}(this)),!0;case "print":return this.J[b]||(this.xa=this.J[b]=c,c.value="",this.u=function(a){return function(b,c){8192<a.value.length&&(a.value=a.value.substr(a.value.length-4096));a.value+=(void 0!==c?c+": ":"")+(b||"")+"\n";a.scrollTop=a.scrollHeight}}(c),this.fa=function(a){this.u(a,this.Za)}),!0;default:return!1}};l.log=function(){};l.u=function(){};
+l.status=function(a){this.u(this.Za+": "+a)};l.fa=function(a,b,c){c=c||this.type;b||q((c?c+": ":"")+a)};function zb(a,b){a.A.error=!0;a.fa(b)}function Ab(a){return a.A.error?(a.u(a.toString()+" error"),!0):!1}function Cb(a,b){b&&(a.A.ready?b():a.cb=b);return a.A.ready}function Mb(a){if(!a.A.error&&(a.A.ready=!0,a.A.ready)){var b=a.cb;a.cb=null;b&&b()}}function Nb(a,b){a.A.Sa&&(b?a.A.ob=!0:void 0===b&&a.u(a.toString()+" busy"));return a.A.Sa}
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 var nb=window?window.PCjs.Machines:{},lb=window?window.PCjs.Components:[],vb=window?window.PCjs.Commands:{},wb=["hold","sleep","wait"],xb={alert:function(a){q(a);return!0},sleep:function(a,b){setTimeout(a,+b);return!1}},yb={select:function(a,b,c){var d=!1;if(a=a.bindings[b])for(b=0;b<a.options.length;b++)if(a.options[b].textContent==c){a.selectedIndex!=b&&(a.selectedIndex=b);d=!0;break}return d}};
 Array.prototype.indexOf||(Array.prototype.indexOf=function(a,b){b=b||0;for(var c=this.length;b<c;b++)if(this[b]===a)return b;return-1});Array.isArray||(Array.isArray=function(a){return"[object Array]"===Object.prototype.toString.call(a)});
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-var v="pdp10",Rb="PDPjs",Sb=Math.pow(2,18)-1,Tb=Math.pow(2,18),Ub=Math.pow(2,17)-1,x=Math.pow(2,18)-1,y=Math.pow(2,18),z=Math.pow(2,35)-1,A=Math.pow(2,35),B=Math.pow(2,36)-1,D=Math.pow(2,36),F=Math.pow(2,32),Vb=Math.pow(2,34),Wb=Math.pow(2,36),Xb=Math.pow(2,21),Yb=Math.pow(2,26),Zb=Math.pow(2,23),$b=Math.pow(2,30),v="pdp10",Rb="PDPjs",ac={cpu:1,trap:2,fault:4,"int":8,bus:16,memory:32,mmu:64,rom:128,device:256,panel:512,keyboard:1024,key:2048,paper:4096,read:16384,write:32768,serial:1048576,timer:2097152,
+var v="pdp10",Rb="PDPjs",Sb=Math.pow(2,18)-1,Tb=Math.pow(2,18),Ub=Math.pow(2,17)-1,x=Math.pow(2,18)-1,y=Math.pow(2,18),z=Math.pow(2,35)-1,A=Math.pow(2,35),B=Math.pow(2,36)-1,D=Math.pow(2,36),E=Math.pow(2,32),Vb=Math.pow(2,34),Wb=Math.pow(2,36),Xb=Math.pow(2,21),Yb=Math.pow(2,26),Zb=Math.pow(2,23),$b=Math.pow(2,30),v="pdp10",Rb="PDPjs",ac={cpu:1,trap:2,fault:4,"int":8,bus:16,memory:32,mmu:64,rom:128,device:256,panel:512,keyboard:1024,key:2048,paper:4096,read:16384,write:32768,serial:1048576,timer:2097152,
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 l.Sb=function(a,b,c){if(ec(this,b)){if(c){var d=this;setTimeout(function(){fc(d,b);a&&a()},+c);return!1}fc(this,b)}return!0};l.kc=function(a,b){if("SR"==a)return kc(this,sa(b,8));var c=this.b[a];return c?(c[1]=+b?1:0,mc(this,a,c[1]),!0):!1};l.lc=function(a){return ec(this,a)?(fc(this,a),!0):!1};function ec(a,b){var c=a.b[b];return c?(mc(a,b,c[1]=1-c[1]),c[3]=!0,c[4]&&c[4].call(a,c[1],c[5]),b!=nc&&(a.P=b==oc,a.R=b==pc),!0):!1}
 function fc(a,b){var c=a.b[b];c&&(c[2]&&c[3]&&(mc(a,b,c[1]=c[0]),c[4]&&c[4].call(a,c[1],c[5])),c[3]=!1)}l.bc=function(a){a||this.v.A.O||(I(this.v,this.i),this.b[qc]&&this.b[qc][1]&&rc(this.v))};l.cc=function(){};l.Xb=function(a){a||this.v.V()};
@@ -75,10 +75,10 @@ l.Vb=function(a){if(!a&&!this.v.A.O)if(this.b[qc]&&this.b[qc][1])rc(this.v);else
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