diff --git a/modules/pdp11/lib/bus.js b/modules/pdp11/lib/bus.js
index b55a8ec2f..cc8e7a29a 100644
--- a/modules/pdp11/lib/bus.js
+++ b/modules/pdp11/lib/bus.js
@@ -5,7 +5,7 @@
  *
  * This file is part of PCjs, a computer emulation software project at <http://pcjs.org/>.
  *
- * It has been adapted from the JavaScript PDP 11/70 Emulator v1.3 written by Paul Nankervis
+ * It has been adapted from the JavaScript PDP 11/70 Emulator v1.4 written by Paul Nankervis
  * (paulnank@hotmail.com) as of August 2016 from http://skn.noip.me/pdp11/pdp11.html.  This code
  * may be used freely provided the original author name is acknowledged in any modified source code.
  *
diff --git a/modules/pdp11/lib/computer.js b/modules/pdp11/lib/computer.js
index abc29fb2f..31a9d8933 100644
--- a/modules/pdp11/lib/computer.js
+++ b/modules/pdp11/lib/computer.js
@@ -5,7 +5,7 @@
  *
  * This file is part of PCjs, a computer emulation software project at <http://pcjs.org/>.
  *
- * It has been adapted from the JavaScript PDP 11/70 Emulator v1.3 written by Paul Nankervis
+ * It has been adapted from the JavaScript PDP 11/70 Emulator v1.4 written by Paul Nankervis
  * (paulnank@hotmail.com) as of August 2016 from http://skn.noip.me/pdp11/pdp11.html.  This code
  * may be used freely provided the original author name is acknowledged in any modified source code.
  *
@@ -184,7 +184,7 @@ function ComputerPDP11(parmsComputer, parmsMachine, fSuspended) {
 
     this.println(PDP11.APPNAME + " v" + PDP11.APPVERSION + "\n" + COPYRIGHT + "\n" + LICENSE);
 
-    this.println("Portions adapted from the PDP-11/70 Emulator v1.3 by Paul Nankervis <paulnank@hotmail.com>");
+    this.println("Portions adapted from the PDP-11/70 Emulator v1.4 by Paul Nankervis <paulnank@hotmail.com>");
 
     if (DEBUG && this.messageEnabled()) this.printMessage("TYPEDARRAYS: " + TYPEDARRAYS);
 
diff --git a/modules/pdp11/lib/cpu.js b/modules/pdp11/lib/cpu.js
index 86d26049e..7b80d6d72 100644
--- a/modules/pdp11/lib/cpu.js
+++ b/modules/pdp11/lib/cpu.js
@@ -5,7 +5,7 @@
  *
  * This file is part of PCjs, a computer emulation software project at <http://pcjs.org/>.
  *
- * It has been adapted from the JavaScript PDP 11/70 Emulator v1.3 written by Paul Nankervis
+ * It has been adapted from the JavaScript PDP 11/70 Emulator v1.4 written by Paul Nankervis
  * (paulnank@hotmail.com) as of August 2016 from http://skn.noip.me/pdp11/pdp11.html.  This code
  * may be used freely provided the original author name is acknowledged in any modified source code.
  *
diff --git a/modules/pdp11/lib/cpuops.js b/modules/pdp11/lib/cpuops.js
index a3f04d256..0dc1e49b1 100644
--- a/modules/pdp11/lib/cpuops.js
+++ b/modules/pdp11/lib/cpuops.js
@@ -5,7 +5,7 @@
  *
  * This file is part of PCjs, a computer emulation software project at <http://pcjs.org/>.
  *
- * It has been adapted from the JavaScript PDP 11/70 Emulator v1.3 written by Paul Nankervis
+ * It has been adapted from the JavaScript PDP 11/70 Emulator v1.4 written by Paul Nankervis
  * (paulnank@hotmail.com) as of August 2016 from http://skn.noip.me/pdp11/pdp11.html.  This code
  * may be used freely provided the original author name is acknowledged in any modified source code.
  *
diff --git a/modules/pdp11/lib/cpustate.js b/modules/pdp11/lib/cpustate.js
index a47d16474..7d4fe952b 100644
--- a/modules/pdp11/lib/cpustate.js
+++ b/modules/pdp11/lib/cpustate.js
@@ -5,7 +5,7 @@
  *
  * This file is part of PCjs, a computer emulation software project at <http://pcjs.org/>.
  *
- * It has been adapted from the JavaScript PDP 11/70 Emulator v1.3 written by Paul Nankervis
+ * It has been adapted from the JavaScript PDP 11/70 Emulator v1.4 written by Paul Nankervis
  * (paulnank@hotmail.com) as of August 2016 from http://skn.noip.me/pdp11/pdp11.html.  This code
  * may be used freely provided the original author name is acknowledged in any modified source code.
  *
diff --git a/modules/pdp11/lib/debugger.js b/modules/pdp11/lib/debugger.js
index 7a0f34bf8..47b6355c9 100644
--- a/modules/pdp11/lib/debugger.js
+++ b/modules/pdp11/lib/debugger.js
@@ -5,7 +5,7 @@
  *
  * This file is part of PCjs, a computer emulation software project at <http://pcjs.org/>.
  *
- * It has been adapted from the JavaScript PDP 11/70 Emulator v1.3 written by Paul Nankervis
+ * It has been adapted from the JavaScript PDP 11/70 Emulator v1.4 written by Paul Nankervis
  * (paulnank@hotmail.com) as of August 2016 from http://skn.noip.me/pdp11/pdp11.html.  This code
  * may be used freely provided the original author name is acknowledged in any modified source code.
  *
diff --git a/modules/pdp11/lib/defines.js b/modules/pdp11/lib/defines.js
index 76cf2211b..cf4a188f0 100644
--- a/modules/pdp11/lib/defines.js
+++ b/modules/pdp11/lib/defines.js
@@ -5,7 +5,7 @@
  *
  * This file is part of PCjs, a computer emulation software project at <http://pcjs.org/>.
  *
- * It has been adapted from the JavaScript PDP 11/70 Emulator v1.3 written by Paul Nankervis
+ * It has been adapted from the JavaScript PDP 11/70 Emulator v1.4 written by Paul Nankervis
  * (paulnank@hotmail.com) as of August 2016 from http://skn.noip.me/pdp11/pdp11.html.  This code
  * may be used freely provided the original author name is acknowledged in any modified source code.
  *
diff --git a/modules/pdp11/lib/device.js b/modules/pdp11/lib/device.js
index 3770e9247..4075c19e7 100644
--- a/modules/pdp11/lib/device.js
+++ b/modules/pdp11/lib/device.js
@@ -5,7 +5,7 @@
  *
  * This file is part of PCjs, a computer emulation software project at <http://pcjs.org/>.
  *
- * It has been adapted from the JavaScript PDP 11/70 Emulator v1.3 written by Paul Nankervis
+ * It has been adapted from the JavaScript PDP 11/70 Emulator v1.4 written by Paul Nankervis
  * (paulnank@hotmail.com) as of August 2016 from http://skn.noip.me/pdp11/pdp11.html.  This code
  * may be used freely provided the original author name is acknowledged in any modified source code.
  *
diff --git a/modules/pdp11/lib/keyboard.js b/modules/pdp11/lib/keyboard.js
index 223eb7e3c..6d9d0452c 100644
--- a/modules/pdp11/lib/keyboard.js
+++ b/modules/pdp11/lib/keyboard.js
@@ -5,7 +5,7 @@
  *
  * This file is part of PCjs, a computer emulation software project at <http://pcjs.org/>.
  *
- * It has been adapted from the JavaScript PDP 11/70 Emulator v1.3 written by Paul Nankervis
+ * It has been adapted from the JavaScript PDP 11/70 Emulator v1.4 written by Paul Nankervis
  * (paulnank@hotmail.com) as of August 2016 from http://skn.noip.me/pdp11/pdp11.html.  This code
  * may be used freely provided the original author name is acknowledged in any modified source code.
  *
diff --git a/modules/pdp11/lib/memory.js b/modules/pdp11/lib/memory.js
index cc2534331..4bfd96973 100644
--- a/modules/pdp11/lib/memory.js
+++ b/modules/pdp11/lib/memory.js
@@ -5,7 +5,7 @@
  *
  * This file is part of PCjs, a computer emulation software project at <http://pcjs.org/>.
  *
- * It has been adapted from the JavaScript PDP 11/70 Emulator v1.3 written by Paul Nankervis
+ * It has been adapted from the JavaScript PDP 11/70 Emulator v1.4 written by Paul Nankervis
  * (paulnank@hotmail.com) as of August 2016 from http://skn.noip.me/pdp11/pdp11.html.  This code
  * may be used freely provided the original author name is acknowledged in any modified source code.
  *
diff --git a/modules/pdp11/lib/messages.js b/modules/pdp11/lib/messages.js
index 7a1927419..ed9312b14 100644
--- a/modules/pdp11/lib/messages.js
+++ b/modules/pdp11/lib/messages.js
@@ -5,7 +5,7 @@
  *
  * This file is part of PCjs, a computer emulation software project at <http://pcjs.org/>.
  *
- * It has been adapted from the JavaScript PDP 11/70 Emulator v1.3 written by Paul Nankervis
+ * It has been adapted from the JavaScript PDP 11/70 Emulator v1.4 written by Paul Nankervis
  * (paulnank@hotmail.com) as of August 2016 from http://skn.noip.me/pdp11/pdp11.html.  This code
  * may be used freely provided the original author name is acknowledged in any modified source code.
  *
diff --git a/modules/pdp11/lib/nodebugger.js b/modules/pdp11/lib/nodebugger.js
index 37799a030..2a11f8c1f 100644
--- a/modules/pdp11/lib/nodebugger.js
+++ b/modules/pdp11/lib/nodebugger.js
@@ -5,7 +5,7 @@
  *
  * This file is part of PCjs, a computer emulation software project at <http://pcjs.org/>.
  *
- * It has been adapted from the JavaScript PDP 11/70 Emulator v1.3 written by Paul Nankervis
+ * It has been adapted from the JavaScript PDP 11/70 Emulator v1.4 written by Paul Nankervis
  * (paulnank@hotmail.com) as of August 2016 from http://skn.noip.me/pdp11/pdp11.html.  This code
  * may be used freely provided the original author name is acknowledged in any modified source code.
  *
diff --git a/modules/pdp11/lib/panel.js b/modules/pdp11/lib/panel.js
index 3bb09c339..bae335d91 100644
--- a/modules/pdp11/lib/panel.js
+++ b/modules/pdp11/lib/panel.js
@@ -5,7 +5,7 @@
  *
  * This file is part of PCjs, a computer emulation software project at <http://pcjs.org/>.
  *
- * It has been adapted from the JavaScript PDP 11/70 Emulator v1.3 written by Paul Nankervis
+ * It has been adapted from the JavaScript PDP 11/70 Emulator v1.4 written by Paul Nankervis
  * (paulnank@hotmail.com) as of August 2016 from http://skn.noip.me/pdp11/pdp11.html.  This code
  * may be used freely provided the original author name is acknowledged in any modified source code.
  *
diff --git a/modules/pdp11/lib/ram.js b/modules/pdp11/lib/ram.js
index 67840ad85..dac5081fd 100644
--- a/modules/pdp11/lib/ram.js
+++ b/modules/pdp11/lib/ram.js
@@ -5,7 +5,7 @@
  *
  * This file is part of PCjs, a computer emulation software project at <http://pcjs.org/>.
  *
- * It has been adapted from the JavaScript PDP 11/70 Emulator v1.3 written by Paul Nankervis
+ * It has been adapted from the JavaScript PDP 11/70 Emulator v1.4 written by Paul Nankervis
  * (paulnank@hotmail.com) as of August 2016 from http://skn.noip.me/pdp11/pdp11.html.  This code
  * may be used freely provided the original author name is acknowledged in any modified source code.
  *
diff --git a/modules/pdp11/lib/rk11.js b/modules/pdp11/lib/rk11.js
index 6f9ae4d1e..cc109cf43 100644
--- a/modules/pdp11/lib/rk11.js
+++ b/modules/pdp11/lib/rk11.js
@@ -5,7 +5,7 @@
  *
  * This file is part of PCjs, a computer emulation software project at <http://pcjs.org/>.
  *
- * It has been adapted from the JavaScript PDP 11/70 Emulator v1.3 written by Paul Nankervis
+ * It has been adapted from the JavaScript PDP 11/70 Emulator v1.4 written by Paul Nankervis
  * (paulnank@hotmail.com) as of August 2016 from http://skn.noip.me/pdp11/pdp11.html.  This code
  * may be used freely provided the original author name is acknowledged in any modified source code.
  *
diff --git a/modules/pdp11/lib/rom.js b/modules/pdp11/lib/rom.js
index 0539e1183..adfab2cfb 100644
--- a/modules/pdp11/lib/rom.js
+++ b/modules/pdp11/lib/rom.js
@@ -5,7 +5,7 @@
  *
  * This file is part of PCjs, a computer emulation software project at <http://pcjs.org/>.
  *
- * It has been adapted from the JavaScript PDP 11/70 Emulator v1.3 written by Paul Nankervis
+ * It has been adapted from the JavaScript PDP 11/70 Emulator v1.4 written by Paul Nankervis
  * (paulnank@hotmail.com) as of August 2016 from http://skn.noip.me/pdp11/pdp11.html.  This code
  * may be used freely provided the original author name is acknowledged in any modified source code.
  *
diff --git a/modules/pdp11/lib/serialport.js b/modules/pdp11/lib/serialport.js
index 9b14a54b7..57dd66dcf 100644
--- a/modules/pdp11/lib/serialport.js
+++ b/modules/pdp11/lib/serialport.js
@@ -5,7 +5,7 @@
  *
  * This file is part of PCjs, a computer emulation software project at <http://pcjs.org/>.
  *
- * It has been adapted from the JavaScript PDP 11/70 Emulator v1.3 written by Paul Nankervis
+ * It has been adapted from the JavaScript PDP 11/70 Emulator v1.4 written by Paul Nankervis
  * (paulnank@hotmail.com) as of August 2016 from http://skn.noip.me/pdp11/pdp11.html.  This code
  * may be used freely provided the original author name is acknowledged in any modified source code.
  *