diff --git a/apps/pdp10/tests/README.md b/apps/pdp10/tests/README.md
index 77c1ec717..b11916dfd 100644
--- a/apps/pdp10/tests/README.md
+++ b/apps/pdp10/tests/README.md
@@ -23,10 +23,11 @@ are provided below.
 
 The [PDP-10 Half-Word Opcode Test](optest-v01.json) file specifies that the following words:
 
-	0o505040111111,   // HRLI   1,111111
-	0o541040444444,   // HRRI   1,444444
-	0o544100000001,   // HLR    2,1
-	0o504100000001,   // HRL    2,1
+	0o505040111111,   // HRLI    1,111111
+	0o541040444444,   // HRRI    1,444444
+	0o544100000001,   // HLR     2,1
+	0o504100000001,   // HRL     2,1
+	...
 
 should be loaded at address 0o100, and that the program counter (PC register) should be set to 0o100.  The embedded
 comments display the instructions that correspond to each word.
diff --git a/apps/pdp10/tests/optest-v01.json b/apps/pdp10/tests/optest-v01.json
index fa347e3a4..8bc0fc825 100644
--- a/apps/pdp10/tests/optest-v01.json
+++ b/apps/pdp10/tests/optest-v01.json
@@ -2,9 +2,15 @@
   "load": 0o100,
   "exec": 0o100,
   "data": [
-    0o505040111111,   // HRLI   1,111111
-    0o541040444444,   // HRRI   1,444444
-    0o544100000001,   // HLR    2,1
-    0o504100000001,   // HRL    2,1
+    0o505040111111,   // HRLI    1,111111
+    0o541040444444,   // HRRI    1,444444
+    0o544100000001,   // HLR     2,1
+    0o504100000001,   // HRL     2,1
+    0o570140000001,   // HRRE    3,1
+    0o530200000002,   // HLLE    4,2
+    0o544240000003,   // HLR     5,3
+    0o504300000004,   // HRL     6,4
+    0o573000000005,   // HRRES   0,5
+    0o533000000006,   // HLLES   0,6
   ]
 }
diff --git a/apps/pdp10/tests/optest-v01.simh b/apps/pdp10/tests/optest-v01.simh
new file mode 100644
index 000000000..361f2636e
--- /dev/null
+++ b/apps/pdp10/tests/optest-v01.simh
@@ -0,0 +1,13 @@
+dep 100 505040111111
+dep 101 541040444444
+dep 102 544100000001
+dep 103 504100000001
+dep 104 570140000001
+dep 105 530200000002
+dep 106 544240000003
+dep 107 504300000004
+dep 110 573000000005
+dep 111 533000000006
+ex -m 100-111
+dep pc 100
+step 10