diff --git a/apps/pdp10/tests/README.md b/apps/pdp10/tests/README.md
index 3aeb4c12b..d45b5ca46 100644
--- a/apps/pdp10/tests/README.md
+++ b/apps/pdp10/tests/README.md
@@ -7,13 +7,20 @@ machines:
     type: pdp10
     config: /devices/pdp10/machine/ka10/test/debugger/machine.xml
     debugger: true
-    commands: a 100 /apps/pdp10/tests/MACTEST1.MAC
 ---
 
-DEC PDP-10 Opcode Tests
------------------------
+DEC PDP-10 Tests
+----------------
 
-The PDP-10 machine below loads the following test:
+This page describes a collection of tests used to perform *very* simple exercises of PDPjs components:
+
+- [Simple Opcode Tests](#simple-opcode-tests)
+- [MACRO-10 Mini-Assembler Tests](#macro-10-mini-assembler-tests) 
+
+Simple Opcode Tests
+-------------------
+
+The PDP-10 machine below loads the following hand-written test:
 
 - [PDP-10 Half-Word Opcode Test](OPTEST01.json)
 
@@ -122,3 +129,36 @@ To assemble and test the same instructions in [SIMH](https://github.com/simh/sim
 	1:	111111444444
 	2:	444444111111
 	3:	000000000000
+
+MACRO-10 Mini-Assembler Tests
+-----------------------------
+
+The following command loads an early test of the built-in PDPjs MACRO-10 Mini-Assembler:
+
+	a 100 /apps/pdp10/tests/TEXT.MAC
+
+[TEXT.MAC](TEXT.MAC.txt) is a copy of the file listed on p. 7-9 of the
+[MACRO-10 Assembler Programmer's Reference Manual (June 1972)](/pubs/dec/pdp10/).  It's a simple test
+of nested macro definitions, recursion, expressions using shift operators and character constants,
+and pseudo-ops **IRPC**, **IFE**, **IFN**, and **EXP**.  It generates 4 words of data. 
+
+If successful, the following results should appear:
+
+	>> a 100 /apps/pdp10/tests/TEXT.MAC
+	starting PCjs MACRO-10 Mini-Assembler...
+	loading TEXT.MAC
+	4 words loaded at 000100-000103
+	00=000000000000 01=000000000000 02=000000000000 03=000000000000 
+	04=000000000000 05=000000000000 06=000000000000 07=000000000000 
+	10=000000000000 11=000000000000 12=000000000000 13=000000000000 
+	14=000000000000 15=000000000000 16=000000000000 17=000000000000 
+	PC=000100 RA=00000000 EA=000000 C0=0 C1=0 OV=0 ND=0 PD=0 
+	000100: 014101 102103  UUO     2,102103(1)
+
+and if you dump the first 4 words with the command `db 100 l4`:
+
+	>> db 100 l4
+	000100: 014101 102103  003 004 011 004 041  ....!
+	000101: 104105 106107  021 004 051 014 043  ..).#
+	000102: 110111 112113  022 004 111 024 045  ..I.%
+	000103: 114000 000000  023 000 000 000 000  .....
diff --git a/apps/pdp10/tests/MACTEST1.MAC.txt b/apps/pdp10/tests/TEXT.MAC.txt
similarity index 100%
rename from apps/pdp10/tests/MACTEST1.MAC.txt
rename to apps/pdp10/tests/TEXT.MAC.txt
diff --git a/modules/pdp10/lib/debugger.js b/modules/pdp10/lib/debugger.js
index 420122f75..f7623b292 100644
--- a/modules/pdp10/lib/debugger.js
+++ b/modules/pdp10/lib/debugger.js
@@ -2867,7 +2867,7 @@ class DebuggerPDP10 extends Debugger {
             while (n-- > 0 && nWords-- > 0) {
                 var w = this.getWord(dbgAddr, 1);
                 if (fJSON) {
-                    if (sData) sData += ",";
+                    if (sData) sData += ',';
                     sData += w;
                 } else {
                     sData += this.toStrWord(w);
@@ -2880,7 +2880,7 @@ class DebuggerPDP10 extends Debugger {
                 var shift = 36 - nBits;
                 for (var i = 0; size == 1 && shift >= 0; i++) {
                     var c = ((w / Math.pow(2, shift)) % Math.pow(2, nBits));
-                    sData += this.toStrBase(c, nBits);
+                    sData += this.toStrBase(c, nBits) + ' ';
                     c += (nBits == 6? 0x20 : 0);
                     sChars += (c < 0x20? '.' : String.fromCharCode(c));
                     shift -= nBits;
diff --git a/pubs/dec/pdp10/README.md b/pubs/dec/pdp10/README.md
index 5ad4d1759..7db425640 100644
--- a/pubs/dec/pdp10/README.md
+++ b/pubs/dec/pdp10/README.md
@@ -8,7 +8,7 @@ PDP-10 Publications
 -------------------
 
 This page summarizes PDP-10 documentation that was useful in creating [PDPjs](/docs/pdpjs/).  In most cases,
-these documents came from the PDF Document Archive at [bitsavers.org](http://bitsavers.org),  in the [/pdf/dec/pdp10/](http://bitsavers.org/pdf/dec/pdp10/)
+these documents came from the PDF Document Archive at [bitsavers.org](http://bitsavers.org), in the [/pdf/dec/pdp10/](http://bitsavers.org/pdf/dec/pdp10/)
 directory.  If a PDF was not searchable, it was "OCR'ed" before being archived below. 
 
 PDP-10 Hardware Publications
@@ -19,4 +19,5 @@ PDP-10 Hardware Publications
 PDP-10 Software Publications
 ----------------------------
 
-- [MACRO-10 Assembler Programmer's Reference Manual (April 1972)](http://archive.pcjs.org/pubs/dec/pdp10/tops10/02_1973AsmRef_macro.pdf) [[Original PDF](http://bitsavers.informatik.uni-stuttgart.de/pdf/dec/pdp10/TOPS10/1973_Assembly_Language_Handbook/02_1973AsmRef_macro.pdf)]
+- [MACRO-10 Assembler Programmer's Reference Manual (June 1972)](http://archive.pcjs.org/pubs/dec/pdp10/tops10/Macro_Assembler_Reference_Manual-Jun72.pdf) [[Original PDF](http://bitsavers.informatik.uni-stuttgart.de/pdf/dec/pdp10/TOPS10/1973_Assembly_Language_Handbook/02_1973AsmRef_macro.pdf)]
+- [MACRO-10 Assembler Programmer's Reference Manual (April 1978)](http://archive.pcjs.org/pubs/dec/pdp10/tops10/Macro_Assembler_Reference_Manual-Apr78.pdf) [[Original PDF](http://www.livingcomputers.org/Discover/Online-Systems/User-Documentation/Tops-10-v7-04/4_Macro_Assembler_Reference_Manual.aspx)]