diff --git a/devices/pdp11/dl11/README.md b/devices/pdp11/dl11/README.md
index b1bba10f1..ad645f250 100644
--- a/devices/pdp11/dl11/README.md
+++ b/devices/pdp11/dl11/README.md
@@ -11,7 +11,9 @@ PDPjs implements the DL11 component in [SerialPortPDP11](/modules/pdp11/lib/seri
 
 This component is typically instantiated by a Machine XML file using:
 
-	<serial id="dl11" adapter="0" binding="print"/>
+```xml
+<serial id="dl11" adapter="0" binding="print"/>
+```
 
 Most of our PDP-11 machines specify *binding="print"* to connect the DL11 to a `<textarea>` that serves as the machine's
 display terminal.
diff --git a/devices/pdp11/pc11/README.md b/devices/pdp11/pc11/README.md
index e1cf38f05..1645d2f3a 100644
--- a/devices/pdp11/pc11/README.md
+++ b/devices/pdp11/pc11/README.md
@@ -29,18 +29,18 @@ used to control the device, such as choosing which tape should be "loaded" into
 ```xml
 <?xml version="1.0" encoding="UTF-8"?>
 <device id="pc11" type="pc11" baudReceive="9600" autoMount='{PTR:{path:"/apps/pdp11/boot/bootstrap/BOOTSTRAP-16KB.json"}}' pos="left" width="35%" padLeft="8px" padBottom="8px">
-	<name>Paper Tape Controls</name>
-	<control type="container">
-		<control type="list" binding="listTapes">
-			<tape id="tape00" name="Bootstrap Loader (16Kb)" path="/apps/pdp11/boot/bootstrap/BOOTSTRAP-16KB.json"/>
-			<tape id="tape01" name="Absolute Loader" path="/apps/pdp11/tapes/absloader/DEC-11-L2PC-PO.json"/>
-			<tape id="tape02" name="BASIC (Single User)" path="/apps/pdp11/tapes/basic/DEC-11-AJPB-PB.json"/>
-		</control>
-		<control type="button" binding="loadTape">Load</control>
-		<control type="button" binding="readTape">Read</control>
-		<control type="description" binding="descTape" padRight="8px"/>
-		<control type="file" binding="mountTape"/>
-		<control type="progress" binding="readProgress" pos="default" width="250px" padTop="8px">Tape Progress</control>
-	</control>
+    <name>Paper Tape Controls</name>
+    <control type="container">
+        <control type="list" binding="listTapes">
+            <tape id="tape00" name="Bootstrap Loader (16Kb)" path="/apps/pdp11/boot/bootstrap/BOOTSTRAP-16KB.json"/>
+            <tape id="tape01" name="Absolute Loader" path="/apps/pdp11/tapes/absloader/DEC-11-L2PC-PO.json"/>
+            <tape id="tape02" name="BASIC (Single User)" path="/apps/pdp11/tapes/basic/DEC-11-AJPB-PB.json"/>
+        </control>
+        <control type="button" binding="loadTape">Load</control>
+        <control type="button" binding="readTape">Read</control>
+        <control type="description" binding="descTape" padRight="8px"/>
+        <control type="file" binding="mountTape"/>
+        <control type="progress" binding="readProgress" pos="default" width="250px" padTop="8px">Tape Progress</control>
+    </control>
 </device>
 ```
diff --git a/devices/pdp11/rk11/README.md b/devices/pdp11/rk11/README.md
index 9f32c5ce4..8fd7b1e71 100644
--- a/devices/pdp11/rk11/README.md
+++ b/devices/pdp11/rk11/README.md
@@ -32,16 +32,16 @@ used to control the device, such as choosing which disks should be "auto-mounted
 ```xml
 <?xml version="1.0" encoding="UTF-8"?>
 <device id="rk11" type="rk11" autoMount='{RK0:{path:"http://archive.pcjs.org/disks/dec/rk03/RK03-XXDP.json"}}' pos="left" width="35%" padLeft="8px" padBottom="8px">
-	<name>Disk Drive Controls</name>
-	<control type="container">
-		<control type="list" binding="listDrives"/>
-		<control type="list" binding="listDisks">
-			<disk id="disk01" name="XXDP+ Diagnostics" path="http://archive.pcjs.org/disks/dec/rk03/RK03-XXDP.json"/>
-		</control>
-		<control type="button" binding="loadDisk">Load</control>
-		<control type="button" binding="bootDisk">Boot</control>
-		<control type="description" binding="descDisk" padRight="8px"/>
-		<control type="file" binding="mountDisk"/>
-	</control>
+    <name>Disk Drive Controls</name>
+    <control type="container">
+        <control type="list" binding="listDrives"/>
+        <control type="list" binding="listDisks">
+            <disk id="disk01" name="XXDP+ Diagnostics" path="http://archive.pcjs.org/disks/dec/rk03/RK03-XXDP.json"/>
+        </control>
+        <control type="button" binding="loadDisk">Load</control>
+        <control type="button" binding="bootDisk">Boot</control>
+        <control type="description" binding="descDisk" padRight="8px"/>
+        <control type="file" binding="mountDisk"/>
+    </control>
 </device>
 ```
diff --git a/devices/pdp11/rl11/README.md b/devices/pdp11/rl11/README.md
index 3b4876e78..6c85544d7 100644
--- a/devices/pdp11/rl11/README.md
+++ b/devices/pdp11/rl11/README.md
@@ -33,16 +33,16 @@ used to control the device, such as choosing which disks should be "auto-mounted
 ```xml
 <?xml version="1.0" encoding="UTF-8"?>
 <device id="rl11" type="rl11" autoMount='{RL0:{path:"http://archive.pcjs.org/disks/dec/rl02k/RL02K-XXDP.json"}}' pos="left" width="35%" padLeft="8px" padBottom="8px">
-	<name>Disk Drive Controls</name>
-	<control type="container">
-		<control type="list" binding="listDrives"/>
-		<control type="list" binding="listDisks">
-			<disk id="disk01" name="XXDP+ Diagnostics" path="http://archive.pcjs.org/disks/dec/rl02k/RL02K-XXDP.json"/>
-		</control>
-		<control type="button" binding="loadDisk">Load</control>
-		<control type="button" binding="bootDisk">Boot</control>
-		<control type="description" binding="descDisk" padRight="8px"/>
-		<control type="file" binding="mountDisk"/>
-	</control>
+    <name>Disk Drive Controls</name>
+    <control type="container">
+        <control type="list" binding="listDrives"/>
+        <control type="list" binding="listDisks">
+            <disk id="disk01" name="XXDP+ Diagnostics" path="http://archive.pcjs.org/disks/dec/rl02k/RL02K-XXDP.json"/>
+        </control>
+        <control type="button" binding="loadDisk">Load</control>
+        <control type="button" binding="bootDisk">Boot</control>
+        <control type="description" binding="descDisk" padRight="8px"/>
+        <control type="file" binding="mountDisk"/>
+    </control>
 </device>
 ```