diff --git a/apps/pdp11/boot/monitor/PDPJSMON.json b/apps/pdp11/boot/monitor/BOOTMON.json
similarity index 100%
rename from apps/pdp11/boot/monitor/PDPJSMON.json
rename to apps/pdp11/boot/monitor/BOOTMON.json
diff --git a/apps/pdp11/boot/monitor/PDPJSMON.mac b/apps/pdp11/boot/monitor/BOOTMON.mac
similarity index 100%
rename from apps/pdp11/boot/monitor/PDPJSMON.mac
rename to apps/pdp11/boot/monitor/BOOTMON.mac
diff --git a/apps/pdp11/boot/monitor/PDPJSMON.txt b/apps/pdp11/boot/monitor/BOOTMON.txt
similarity index 100%
rename from apps/pdp11/boot/monitor/PDPJSMON.txt
rename to apps/pdp11/boot/monitor/BOOTMON.txt
diff --git a/apps/pdp11/boot/monitor/README.md b/apps/pdp11/boot/monitor/README.md
index 363fd4d25..3a7ab062e 100644
--- a/apps/pdp11/boot/monitor/README.md
+++ b/apps/pdp11/boot/monitor/README.md
@@ -9,16 +9,16 @@ redirect_from:
 PDP-11 Boot Monitor
 -------------------
 
-[PDPJSMON.mac](PDPJSMON.mac) is a custom boot monitor/loader based on [boot.mac](http://skn.noip.me/pdp11/boot.mac) written by
+[BOOTMON.mac](BOOTMON.mac) is a custom boot monitor/loader based on [boot.mac](http://skn.noip.me/pdp11/boot.mac) written by
 [Paul Nankervis](mailto:paulnank@hotmail.com).  It is used with all our PDP-11 test machines.
 
-[PDPJSMON.mac](PDPJSMON.mac) was cross-assembled with [MACRO11](https://github.com/shattered/macro11) to produce
-[PDPJSMON.txt](PDPJSMON.txt), which was then processed by [FileDump](/modules/filedump/) to produce
-[PDPJSMON.json](PDPJSMON.json).
+[BOOTMON.mac](BOOTMON.mac) was cross-assembled with [MACRO11](https://github.com/shattered/macro11) to produce
+[BOOTMON.txt](BOOTMON.txt), which was then processed by [FileDump](/modules/filedump/) to produce
+[BOOTMON.json](BOOTMON.json).
 
 To see the Boot Monitor in action, try the [PDP-11/70 Boot Monitor (with Debugger)](/devices/pdp11/machine/1170/monitor/debugger/).
 
-The **PDPJSMON.mac** source code is shown below.
+The **BOOTMON.mac** source code is shown below.
 
 	; BOOT MONITOR
 	;
diff --git a/apps/pdp11/boot/monitor/makefile b/apps/pdp11/boot/monitor/makefile
index 5a9085304..0465f447f 100644
--- a/apps/pdp11/boot/monitor/makefile
+++ b/apps/pdp11/boot/monitor/makefile
@@ -2,10 +2,10 @@
 # Don't have macro11?  Make yourself a copy from https://github.com/shattered/macro11
 #
 
-all: PDPJSMON.json
+all: BOOTMON.json
 
-PDPJSMON.txt: PDPJSMON.mac
-	macro11 PDPJSMON.mac -l PDPJSMON.txt
+BOOTMON.txt: BOOTMON.mac
+	macro11 BOOTMON.mac -l BOOTMON.txt
 
-PDPJSMON.json: PDPJSMON.txt
-	node ../../../../modules/filedump/bin/filedump --file=PDPJSMON.txt --format=octal --output=PDPJSMON.json --overwrite
+BOOTMON.json: BOOTMON.txt
+	node ../../../../modules/filedump/bin/filedump --file=BOOTMON.txt --format=octal --output=BOOTMON.json --overwrite
diff --git a/devices/pdp11/machine/1120/monitor/README.md b/devices/pdp11/machine/1120/monitor/README.md
index 8c9ef5c2b..78a875dde 100644
--- a/devices/pdp11/machine/1120/monitor/README.md
+++ b/devices/pdp11/machine/1120/monitor/README.md
@@ -12,7 +12,7 @@ PDP-11/20 Boot Monitor
 
 The machine below pre-loads the [PDP-11 Boot Monitor](/apps/pdp11/boot/monitor/) into RAM:
 
-	<ram id="ram" addr="0x0000" size="0xE000" file="/apps/pdp11/boot/monitor/PDPJSMON.json" load="0xC000" exec="0xC000"/>
+	<ram id="ram" addr="0x0000" size="0xE000" file="/apps/pdp11/boot/monitor/BOOTMON.json" load="0xC000" exec="0xC000"/>
 
 {% include machine.html id="test1120" %}
 
diff --git a/devices/pdp11/machine/1120/monitor/debugger/README.md b/devices/pdp11/machine/1120/monitor/debugger/README.md
index 8dafedd2f..604c38242 100644
--- a/devices/pdp11/machine/1120/monitor/debugger/README.md
+++ b/devices/pdp11/machine/1120/monitor/debugger/README.md
@@ -13,6 +13,6 @@ PDP-11/20 Boot Monitor (with Debugger)
 
 The machine below pre-loads the [PDP-11 Boot Monitor](/apps/pdp11/boot/monitor/) into RAM:
 
-	<ram id="ram" addr="0x0000" size="0xE000" file="/apps/pdp11/boot/monitor/PDPJSMON.json" load="0xC000" exec="0xC000"/>
+	<ram id="ram" addr="0x0000" size="0xE000" file="/apps/pdp11/boot/monitor/BOOTMON.json" load="0xC000" exec="0xC000"/>
 
 {% include machine.html id="test1120" %}
diff --git a/devices/pdp11/machine/1120/monitor/debugger/machine.xml b/devices/pdp11/machine/1120/monitor/debugger/machine.xml
index 1e46df5a9..68361531b 100644
--- a/devices/pdp11/machine/1120/monitor/debugger/machine.xml
+++ b/devices/pdp11/machine/1120/monitor/debugger/machine.xml
@@ -4,7 +4,7 @@
 	<name pos="center">PDP-11/20 Boot Monitor with 56Kb and Debugger</name>
 	<computer id="computer" busWidth="16"/>
 	<cpu id="cpu" model="1120" cycles="6666667"/>
-	<ram id="ram" addr="0x0000" size="0xE000" file="/apps/pdp11/boot/monitor/PDPJSMON.json"/>
+	<ram id="ram" addr="0x0000" size="0xE000" file="/apps/pdp11/boot/monitor/BOOTMON.json"/>
 	<device id="default" type="default"/>
 	<device id="pc11" type="pc11"/>
 	<serial id="dl11" adapter="0" binding="print"/>
diff --git a/devices/pdp11/machine/1120/monitor/machine.xml b/devices/pdp11/machine/1120/monitor/machine.xml
index 878ba43ba..4c78fb97b 100644
--- a/devices/pdp11/machine/1120/monitor/machine.xml
+++ b/devices/pdp11/machine/1120/monitor/machine.xml
@@ -4,7 +4,7 @@
 	<name pos="center">PDP-11/20 Boot Monitor with 56Kb</name>
 	<computer id="computer" busWidth="16"/>
 	<cpu id="cpu" model="1120" cycles="6666667" autoStart="true"/>
-	<ram id="ram" addr="0x0000" size="0xE000" file="/apps/pdp11/boot/monitor/PDPJSMON.json"/>
+	<ram id="ram" addr="0x0000" size="0xE000" file="/apps/pdp11/boot/monitor/BOOTMON.json"/>
 	<device id="default" type="default"/>
 	<device id="pc11" type="pc11"/>
 	<serial id="dl11" adapter="0" binding="print"/>
diff --git a/devices/pdp11/machine/1170/monitor/debugger/machine.xml b/devices/pdp11/machine/1170/monitor/debugger/machine.xml
index b76e6522a..1048b5e45 100644
--- a/devices/pdp11/machine/1170/monitor/debugger/machine.xml
+++ b/devices/pdp11/machine/1170/monitor/debugger/machine.xml
@@ -4,7 +4,7 @@
 	<name pos="center">PDP-11/70 Boot Monitor with Debugger</name>
 	<computer id="computer" busWidth="22"/>
 	<cpu id="cpu" model="1170" cycles="6666667"/>
-	<ram id="ram" addr="0x00000" size="0x3E000" file="/apps/pdp11/boot/monitor/PDPJSMON.json"/>
+	<ram id="ram" addr="0x00000" size="0x3E000" file="/apps/pdp11/boot/monitor/BOOTMON.json"/>
 	<device id="default" type="default"/>
 	<serial id="dl11" adapter="0" binding="print"/>
 	<panel ref="/devices/pdp11/panel/test/debugger/terminal.xml"/>
diff --git a/devices/pdp11/machine/1170/monitor/machine.xml b/devices/pdp11/machine/1170/monitor/machine.xml
index 899d360cc..4555932a2 100644
--- a/devices/pdp11/machine/1170/monitor/machine.xml
+++ b/devices/pdp11/machine/1170/monitor/machine.xml
@@ -4,7 +4,7 @@
 	<name pos="center">PDP-11/70 Boot Monitor</name>
 	<computer id="computer" busWidth="22"/>
 	<cpu id="cpu" model="1170" cycles="6666667" autoStart="true"/>
-	<ram id="ram" addr="0x00000" size="0x3E000" file="/apps/pdp11/boot/monitor/PDPJSMON.json"/>
+	<ram id="ram" addr="0x00000" size="0x3E000" file="/apps/pdp11/boot/monitor/BOOTMON.json"/>
 	<device id="default" type="default"/>
 	<serial id="dl11" adapter="0" binding="print"/>
 	<panel ref="/devices/pdp11/panel/test/terminal.xml"/>
diff --git a/devices/pdp11/machine/1170/panel/debugger/machine.xml b/devices/pdp11/machine/1170/panel/debugger/machine.xml
index e5fbe66fa..038d3e746 100644
--- a/devices/pdp11/machine/1170/panel/debugger/machine.xml
+++ b/devices/pdp11/machine/1170/panel/debugger/machine.xml
@@ -4,12 +4,12 @@
 	<name pos="center">PDP-11/70 with Front Panel and Debugger</name>
 	<computer id="computer" busWidth="22"/>
 	<cpu id="cpu" model="1170" cycles="6666667"/>
-	<ram id="ram" addr="0x00000" size="0x3E000" file="/apps/pdp11/boot/monitor/PDPJSMON.json"/>
+	<ram id="ram" addr="0x00000" size="0x3E000" file="/apps/pdp11/boot/monitor/BOOTMON.json"/>
 	<rom id="m9312" addr="0xEA00" size="0x200" file="/devices/pdp11/rom/M9312/23-616F1.json"/>
 	<device id="default" type="default"/>
 	<serial id="dl11" adapter="0" binding="print" upperCase="true"/>
 	<panel ref="/devices/pdp11/panel/1170/debugger/front.xml"/>
-	<debugger id="debugger" base="8" messages="fault|disk|halt" commands=""/>
+	<debugger id="debugger" base="8" messages="fault|disk" commands=""/>
 	<device ref="/devices/pdp11/pc11/default.xml"/>
 	<device ref="/devices/pdp11/rl11/default.xml"/>
 </machine>
diff --git a/devices/pdp11/machine/1170/panel/machine.xml b/devices/pdp11/machine/1170/panel/machine.xml
index 35304c3f4..a53724d35 100644
--- a/devices/pdp11/machine/1170/panel/machine.xml
+++ b/devices/pdp11/machine/1170/panel/machine.xml
@@ -4,7 +4,7 @@
 	<name pos="center">PDP-11/70 with Front Panel</name>
 	<computer id="computer" busWidth="22"/>
 	<cpu id="cpu" model="1170" cycles="6666667" autoStart="true"/>
-	<ram id="ram" addr="0x00000" size="0x3E000" file="/apps/pdp11/boot/monitor/PDPJSMON.json"/>
+	<ram id="ram" addr="0x00000" size="0x3E000" file="/apps/pdp11/boot/monitor/BOOTMON.json"/>
 	<rom id="m9312" addr="0xEA00" size="0x200" file="/devices/pdp11/rom/M9312/23-616F1.json"/>
 	<device id="default" type="default"/>
 	<serial id="dl11" adapter="0" binding="print" upperCase="true"/>
diff --git a/devices/pdp11/machine/1170/vt100/debugger/machine.xml b/devices/pdp11/machine/1170/vt100/debugger/machine.xml
index 7ae1f88e8..1fa4fe659 100644
--- a/devices/pdp11/machine/1170/vt100/debugger/machine.xml
+++ b/devices/pdp11/machine/1170/vt100/debugger/machine.xml
@@ -4,7 +4,7 @@
 	<name pos="center">PDP-11/70 with Front Panel</name>
 	<computer id="computer" busWidth="22"/>
 	<cpu id="cpu" model="1170" cycles="6666667" autoStart="true"/>
-	<ram id="ram" addr="0x00000" size="0x3E000" file="/apps/pdp11/boot/monitor/PDPJSMON.json"/>
+	<ram id="ram" addr="0x00000" size="0x3E000" file="/apps/pdp11/boot/monitor/BOOTMON.json"/>
 	<device id="default" type="default"/>
 	<serial id="dl11" adapter="0"/>
 	<panel ref="/devices/pdp11/panel/1170/debugger/front.xml"/>
diff --git a/devices/pdp11/machine/1170/vt100/machine.xml b/devices/pdp11/machine/1170/vt100/machine.xml
index 2ac6456a4..7c5d4f169 100644
--- a/devices/pdp11/machine/1170/vt100/machine.xml
+++ b/devices/pdp11/machine/1170/vt100/machine.xml
@@ -4,7 +4,7 @@
 	<name pos="center">PDP-11/70 with Front Panel</name>
 	<computer id="computer" busWidth="22"/>
 	<cpu id="cpu" model="1170" cycles="6666667" autoStart="true"/>
-	<ram id="ram" addr="0x00000" size="0x3E000" file="/apps/pdp11/boot/monitor/PDPJSMON.json"/>
+	<ram id="ram" addr="0x00000" size="0x3E000" file="/apps/pdp11/boot/monitor/BOOTMON.json"/>
 	<device id="default" type="default"/>
 	<serial id="dl11" adapter="0"/>
 	<panel ref="/devices/pdp11/panel/1170/front.xml"/>
diff --git a/modules/pdp11/lib/defines.js b/modules/pdp11/lib/defines.js
index acd6440cf..49bb2f2b9 100644
--- a/modules/pdp11/lib/defines.js
+++ b/modules/pdp11/lib/defines.js
@@ -434,9 +434,9 @@ var PDP11 = {
 
         RLCS:       0o174400,   //                                  RL11 Control Status Register
         RLBA:       0o174402,   //                                  RL11 Bus Address Register
-        RLDA:       0o177404,   //                                  RL11 Disk Address Register
-        RLMP:       0o177406,   //                                  RL11 Multi-Purpose Register
-        RLBE:       0o177410,   //                                  RL11 Bus (Address) Extension Register (RLV12 controller only)
+        RLDA:       0o174404,   //                                  RL11 Disk Address Register
+        RLMP:       0o174406,   //                                  RL11 Multi-Purpose Register
+        RLBE:       0o174410,   //                                  RL11 Bus (Address) Extension Register (RLV12 controller only)
 
         LKS:        0o177546,   //                                  KW11-L Clock Status