diff -Naur hplip-3.22.6/data/models/models.dat hplip-3.22.6.sp1/data/models/models.dat
--- hplip-3.22.6/data/models/models.dat	2022-06-23 06:56:29.000000000 +0200
+++ hplip-3.22.6.sp1/data/models/models.dat	2022-07-24 10:39:57.908155121 +0200
@@ -18141,7 +18141,7 @@
 support-ver=0.9.5
 tech-class=LJMono
 family-class=LJ-Class6
-tech-subclass=Normal
+tech-subclass=CenterAligned
 tech-type=3
 usb-pid=0
 usb-vid=3f0
@@ -18224,7 +18224,7 @@
 support-ver=0.9.5
 tech-class=LJMono
 family-class=LJ-Class6
-tech-subclass=Normal
+tech-subclass=CenterAligned
 tech-type=3
 usb-pid=0
 usb-vid=3f0
@@ -18467,7 +18467,7 @@
 support-ver=0.9.5
 tech-class=LJMono
 family-class=LJ-Class6
-tech-subclass=Normal
+tech-subclass=CenterAligned
 tech-type=3
 usb-pid=0
 usb-vid=3f0
diff -Naur hplip-3.22.6/Normalize.cpp hplip-3.22.6.sp1/Normalize.cpp
--- hplip-3.22.6/Normalize.cpp	2022-06-23 06:56:29.000000000 +0200
+++ hplip-3.22.6.sp1/Normalize.cpp	2022-07-24 10:39:57.908155121 +0200
@@ -119,7 +119,8 @@
     "Mono_Duplex",
     "AutoDuplex",
     "K10",
-    "CuHdIPH"
+    "CuHdIPH",
+    "CenterAligned"
 };
 
 /** string array of shortening replacements                 */
diff -Naur hplip-3.22.6/Normalize.h hplip-3.22.6.sp1/Normalize.h
--- hplip-3.22.6/Normalize.h	2022-06-23 06:56:29.000000000 +0200
+++ hplip-3.22.6.sp1/Normalize.h	2022-07-24 10:39:57.908155121 +0200
@@ -6,7 +6,7 @@
 #define MAX_TECH_CLASS_PDL                 67
 #define MAX_TECH_CLASS                     77
 #define MAX_FAMILY_CLASS                   54
-#define MAX_SUB_CLASS                      32
+#define MAX_SUB_CLASS                      33
 
 
 #define COLOR                              "Color"
diff -Naur hplip-3.22.6/prnt/drv/hpcups.drv.in.template hplip-3.22.6.sp1/prnt/drv/hpcups.drv.in.template
--- hplip-3.22.6/prnt/drv/hpcups.drv.in.template	2022-06-23 06:56:29.000000000 +0200
+++ hplip-3.22.6.sp1/prnt/drv/hpcups.drv.in.template	2022-07-24 10:39:57.908155121 +0200
@@ -13750,6 +13750,12 @@
     Choice "Draft/Draft (Economy)" "<</OutputType(-1)/HWResolution[300 300]>>setpagedevice"
     Choice "Best/Best" "<</OutputType(0)/HWResolution[600 600]>>setpagedevice"
 
+  /*  Dummy option to handle the center-aligned paper guide feature of the
+      LaserJet 1100 family */
+  Option "PaperAlignment/Paper Alignment" PickOne AnySetup 10.0
+   *Choice "Left" ""
+   Choice "Center" "<</cupsInteger1 783>>setpagedevice"
+
   // Duplexer is optional...
   Installable "OptionDuplex/Duplexer Installed"
 
@@ -13825,11 +13831,19 @@
     MinSize 1in 4in
     MaxSize 8.5in 14in
 
-    // <%LJMono:Normal%>
     {
+      UIConstraints "*PaperAlignment Center *MediaType" 
+      // <%LJMono:Normal%>
+    }
+    {
+      UIConstraints "*PaperAlignment Center *MediaType" 
       UIConstraints "*OutputMode Best *MediaType"
       // <%LJMono:300dpiOnly%>
     }
+    {
+      UIConstraints "*PaperAlignment Left *MediaType"
+      // <%LJMono:CenterAligned%>
+    }
   } // End Supported media sizes.
 
   {
diff -Naur hplip-3.22.6/prnt/hpcups/Encapsulator.cpp hplip-3.22.6.sp1/prnt/hpcups/Encapsulator.cpp
--- hplip-3.22.6/prnt/hpcups/Encapsulator.cpp	2022-06-23 06:56:29.000000000 +0200
+++ hplip-3.22.6.sp1/prnt/hpcups/Encapsulator.cpp	2022-07-24 10:39:57.908155121 +0200
@@ -255,6 +255,14 @@
         addToHeader((const BYTE *) szStr, 20);
     }
 
+    top_margin = m_pMA->printable_start_y - ((m_pJA->mech_offset * m_pQA->actual_vertical_resolution)/1000);
+    int left_margin = 0;
+    if (m_pJA->integer_values[1] > 0)
+    {
+        left_margin = ((m_pJA->integer_values[1] * m_pQA->horizontal_resolution) / 100 - m_pMA->printable_width) / 2;
+    }
+    addToHeader("\x1b*p%dx%dY", left_margin, top_margin);
+
     const BYTE *pgrafMode = grafMode2;
     if (m_pJA->color_mode == 0)
     {
@@ -266,14 +274,6 @@
     addToHeader((const BYTE *) pgrafMode, 5);
     addToHeader((const BYTE *) seedSame, sizeof(seedSame));
 
-    top_margin = m_pMA->printable_start_y - ((m_pJA->mech_offset * m_pQA->actual_vertical_resolution)/1000);
-    int left_margin = 0;
-    if (m_pJA->integer_values[1] > 0)
-    {
-        left_margin = ((m_pJA->integer_values[1] * m_pQA->horizontal_resolution) / 100 - m_pMA->printable_width) / 2;
-    }
-    addToHeader("\x1b*p%dx%dY", left_margin, top_margin);
-
     return;
 }