diff --git a/SourceGen/AsmGen/AsmAcme.cs b/SourceGen/AsmGen/AsmAcme.cs
index 6b35050..24f85bb 100644
--- a/SourceGen/AsmGen/AsmAcme.cs
+++ b/SourceGen/AsmGen/AsmAcme.cs
@@ -106,6 +106,7 @@ namespace SourceGen.AsmGen {
         private static PseudoOp.PseudoOpNames sDataOpNames =
             new PseudoOp.PseudoOpNames(new Dictionary<string, string> {
                 { "EquDirective", "=" },
+                //VarDirective
                 { "OrgDirective", "!pseudopc" },
                 //RegWidthDirective         // !al, !as, !rl, !rs
                 { "DefineData1", "!byte" },
@@ -470,6 +471,11 @@ namespace SourceGen.AsmGen {
                 valueStr, SourceFormatter.FormatEolComment(comment));
         }
 
+        // IGenerator
+        public void OutputVarDirective(string name, string valueStr, string comment) {
+            OutputEquDirective(name, valueStr, comment);
+        }
+
         // IGenerator
         public void OutputOrgDirective(int offset, int address) {
             // For the first one, set the "real" PC.  For all subsequent directives, set the
diff --git a/SourceGen/AsmGen/AsmCc65.cs b/SourceGen/AsmGen/AsmCc65.cs
index 0220f7f..43bb542 100644
--- a/SourceGen/AsmGen/AsmCc65.cs
+++ b/SourceGen/AsmGen/AsmCc65.cs
@@ -103,6 +103,7 @@ namespace SourceGen.AsmGen {
         private static PseudoOp.PseudoOpNames sDataOpNames =
             new PseudoOp.PseudoOpNames(new Dictionary<string, string> {
                 { "EquDirective", "=" },
+                //VarDirective
                 { "OrgDirective", ".org" },
                 //RegWidthDirective         // .a8, .a16, .i8, .i16
                 { "DefineData1", ".byte" },
@@ -504,6 +505,11 @@ namespace SourceGen.AsmGen {
                 valueStr, SourceFormatter.FormatEolComment(comment));
         }
 
+        // IGenerator
+        public void OutputVarDirective(string name, string valueStr, string comment) {
+            OutputEquDirective(name, valueStr, comment);
+        }
+
         // IGenerator
         public void OutputOrgDirective(int offset, int address) {
             // Linear search for offset.  List should be small, so this should be quick.
diff --git a/SourceGen/AsmGen/AsmMerlin32.cs b/SourceGen/AsmGen/AsmMerlin32.cs
index 3697bab..1e36550 100644
--- a/SourceGen/AsmGen/AsmMerlin32.cs
+++ b/SourceGen/AsmGen/AsmMerlin32.cs
@@ -94,6 +94,7 @@ namespace SourceGen.AsmGen {
         private static PseudoOp.PseudoOpNames sDataOpNames =
             new PseudoOp.PseudoOpNames(new Dictionary<string, string> {
                 { "EquDirective", "equ" },
+                { "VarDirective", "~=" },       // not really
                 { "OrgDirective", "org" },
                 //RegWidthDirective
                 { "DefineData1", "dfb" },
@@ -397,6 +398,12 @@ namespace SourceGen.AsmGen {
                 valueStr, SourceFormatter.FormatEolComment(comment));
         }
 
+        // IGenerator
+        public void OutputVarDirective(string name, string valueStr, string comment) {
+            OutputLine("]" + name, SourceFormatter.FormatPseudoOp(sDataOpNames.EquDirective),
+                valueStr, SourceFormatter.FormatEolComment(comment));
+        }
+
         // IGenerator
         public void OutputOrgDirective(int offset, int address) {
             OutputLine(string.Empty, SourceFormatter.FormatPseudoOp(sDataOpNames.OrgDirective),
diff --git a/SourceGen/AsmGen/AsmTass64.cs b/SourceGen/AsmGen/AsmTass64.cs
index b20c3ef..a784926 100644
--- a/SourceGen/AsmGen/AsmTass64.cs
+++ b/SourceGen/AsmGen/AsmTass64.cs
@@ -120,6 +120,7 @@ namespace SourceGen.AsmGen {
         private static PseudoOp.PseudoOpNames sDataOpNames =
             new PseudoOp.PseudoOpNames(new Dictionary<string, string> {
                 { "EquDirective", "=" },
+                { "VarDirective", ".var" },
                 { "OrgDirective", ".logical" },
                 //RegWidthDirective         // .as, .al, .xs, .xl
                 { "DefineData1", ".byte" },
@@ -535,6 +536,12 @@ namespace SourceGen.AsmGen {
                 valueStr, SourceFormatter.FormatEolComment(comment));
         }
 
+        // IGenerator
+        public void OutputVarDirective(string name, string valueStr, string comment) {
+            OutputLine(name, SourceFormatter.FormatPseudoOp(sDataOpNames.VarDirective),
+                valueStr, SourceFormatter.FormatEolComment(comment));
+        }
+
         // IGenerator
         public void OutputOrgDirective(int offset, int address) {
             // 64tass separates the "compile offset", which determines where the output fits
diff --git a/SourceGen/AsmGen/IGenerator.cs b/SourceGen/AsmGen/IGenerator.cs
index 5e51952..d366523 100644
--- a/SourceGen/AsmGen/IGenerator.cs
+++ b/SourceGen/AsmGen/IGenerator.cs
@@ -136,6 +136,14 @@ namespace SourceGen.AsmGen {
         /// <param name="comment">End-of-line comment.</param>
         void OutputEquDirective(string name, string valueStr, string comment);
 
+        /// <summary>
+        /// Outputs a variable definition directive.  The numeric value is already formatted.
+        /// </summary>
+        /// <param name="name">Symbol label.</param>
+        /// <param name="valueStr">Formatted value.</param>
+        /// <param name="comment">End-of-line comment.</param>
+        void OutputVarDirective(string name, string valueStr, string comment);
+
         /// <summary>
         /// Outputs a code origin directive.
         /// </summary>
diff --git a/SourceGen/LineListGen.cs b/SourceGen/LineListGen.cs
index c0655b3..2dfc6fa 100644
--- a/SourceGen/LineListGen.cs
+++ b/SourceGen/LineListGen.cs
@@ -1331,7 +1331,7 @@ namespace SourceGen {
                     PseudoOp.FormatNumericOpFlags.None);
                 string comment = mFormatter.FormatEolComment(defSym.Comment);
                 return FormattedParts.CreateEquDirective(defSym.Label,
-                    mFormatter.FormatPseudoOp(mPseudoOpNames.EquDirective),
+                    mFormatter.FormatPseudoOp(mPseudoOpNames.VarDirective),
                     addrStr, comment);
             }
         }
diff --git a/SourceGen/PseudoOp.cs b/SourceGen/PseudoOp.cs
index 4d5756c..4ad47fa 100644
--- a/SourceGen/PseudoOp.cs
+++ b/SourceGen/PseudoOp.cs
@@ -65,6 +65,7 @@ namespace SourceGen {
         /// </summary>
         public class PseudoOpNames {
             public string EquDirective { get; private set; }
+            public string VarDirective { get; private set; }
             public string OrgDirective { get; private set; }
             public string RegWidthDirective { get; private set; }
 
@@ -85,10 +86,9 @@ namespace SourceGen {
             public string StrDci { get; private set; }
 
             /// <summary>
-            /// Constructs an empty PseudoOp.
+            /// Constructs an empty PseudoOp, for deserialization.
             /// </summary>
-            public PseudoOpNames() : this(new Dictionary<string, string>()) {
-            }
+            public PseudoOpNames() : this(new Dictionary<string, string>()) { }
 
             /// <summary>
             /// Constructor.  Pass in a dictionary with name/value pairs.  Unknown names
@@ -113,6 +113,7 @@ namespace SourceGen {
                     return false;   // one is null
                 }
                 return a.EquDirective == b.EquDirective &&
+                    a.VarDirective == b.VarDirective &&
                     a.OrgDirective == b.OrgDirective &&
                     a.RegWidthDirective == b.RegWidthDirective &&
                     a.DefineData1 == b.DefineData1 &&
@@ -217,12 +218,10 @@ namespace SourceGen {
         /// <summary>
         /// Returns a PseudoOpNames instance with some reasonable defaults for on-screen display.
         /// </summary>
-        public static PseudoOpNames DefaultPseudoOpNames {
-            get { return sDefaultPseudoOpNames; }
-        }
-        private static readonly PseudoOpNames sDefaultPseudoOpNames =
+        public static PseudoOpNames DefaultPseudoOpNames { get; } =
             new PseudoOpNames(new Dictionary<string, string> {
                 { "EquDirective", ".eq" },
+                { "VarDirective", ".var" },
                 { "OrgDirective", ".org" },
                 { "RegWidthDirective", ".rwid" },
 
diff --git a/SourceGen/WpfGui/EditAppSettings.xaml b/SourceGen/WpfGui/EditAppSettings.xaml
index 774ac34..f313d27 100644
--- a/SourceGen/WpfGui/EditAppSettings.xaml
+++ b/SourceGen/WpfGui/EditAppSettings.xaml
@@ -592,13 +592,10 @@ limitations under the License.
                         <Grid.ColumnDefinitions>
                             <ColumnDefinition Width="*"/>
                             <ColumnDefinition Width="0.8*"/>
-                            <ColumnDefinition Width="0"/>
                             <ColumnDefinition Width="*"/>
                             <ColumnDefinition Width="0.8*"/>
-                            <ColumnDefinition Width="0"/>
                             <ColumnDefinition Width="*"/>
                             <ColumnDefinition Width="0.8*"/>
-                            <ColumnDefinition Width="0"/>
                             <ColumnDefinition Width="*"/>
                             <ColumnDefinition Width="0.8*"/>
                         </Grid.ColumnDefinitions>
@@ -611,114 +608,118 @@ limitations under the License.
                             <RowDefinition Height="*"/>
                         </Grid.RowDefinitions>
 
-                        <!-- first column -->
+                        <!-- first row -->
                         <TextBlock Grid.Column="0" Grid.Row="0" Text="Equate:"
                                    HorizontalAlignment="Right" VerticalAlignment="Center"/>
-                        <StackPanel Grid.Column="0" Grid.Row="1" VerticalAlignment="Center">
-                            <TextBlock Text="Little-endian" HorizontalAlignment="Right"/>
-                            <TextBlock Text="data, one byte:" HorizontalAlignment="Right"/>
-                        </StackPanel>
-                        <StackPanel Grid.Column="0" Grid.Row="2" VerticalAlignment="Center">
-                            <TextBlock Text="Big-endian data," HorizontalAlignment="Right"/>
-                            <TextBlock Text="two bytes:" HorizontalAlignment="Right"/>
-                        </StackPanel>
-                        <TextBlock Grid.Column="0" Grid.Row="3" Text="Generic str:"
-                                   HorizontalAlignment="Right" VerticalAlignment="Center"/>
-                        <TextBlock Grid.Column="0" Grid.Row="4" Text="1-byte len str:"
-                                   HorizontalAlignment="Right" VerticalAlignment="Center"/>
-
                         <TextBox Name="equDirectiveTextBox" Grid.Column="1" Grid.Row="0"
                                  VerticalAlignment="Center" Margin="{StaticResource TBS}"
                                  Text=".placeho" MaxLength="12"
                                  FontFamily="{StaticResource GeneralMonoFont}"/>
-                        <TextBox Name="defineData1TextBox" Grid.Column="1" Grid.Row="1"
-                                 VerticalAlignment="Center" Margin="{StaticResource TBS}"
-                                 Text=".placeho" MaxLength="12"
-                                 FontFamily="{StaticResource GeneralMonoFont}"/>
-                        <TextBox Name="defineBigData2TextBox" Grid.Column="1" Grid.Row="2"
-                                 VerticalAlignment="Center" Margin="{StaticResource TBS}"
-                                 Text=".placeho" MaxLength="12"
-                                 FontFamily="{StaticResource GeneralMonoFont}"/>
-                        <TextBox Name="strGenericTextBox" Grid.Column="1" Grid.Row="3"
-                                 VerticalAlignment="Center" Margin="{StaticResource TBS}"
-                                 Text=".placeho" MaxLength="12"
-                                 FontFamily="{StaticResource GeneralMonoFont}"/>
-                        <TextBox Name="strLen8TextBox" Grid.Column="1" Grid.Row="4"
-                                 VerticalAlignment="Center" Margin="{StaticResource TBS}"
-                                 Text=".placeho" MaxLength="12"
-                                 FontFamily="{StaticResource GeneralMonoFont}"/>
-
-                        <!-- second column -->
-                        <TextBlock Grid.Column="3" Grid.Row="0" Text="Origin:"
+                        <TextBlock Grid.Column="2" Grid.Row="0" Text="Variable:"
                                    HorizontalAlignment="Right" VerticalAlignment="Center"/>
-                        <TextBlock Grid.Column="3" Grid.Row="1" Text="Two bytes:"
+                        <TextBox Name="varDirectiveTextBox" Grid.Column="3" Grid.Row="0"
+                                 VerticalAlignment="Center" Margin="{StaticResource TBS}"
+                                 Text=".placeho" MaxLength="12"
+                                 FontFamily="{StaticResource GeneralMonoFont}"/>
+                        <TextBlock Grid.Column="4" Grid.Row="0" Text="Origin:"
                                    HorizontalAlignment="Right" VerticalAlignment="Center"/>
-                        <TextBlock Grid.Column="3" Grid.Row="3" Text="Reverse str:"
-                                   HorizontalAlignment="Right" VerticalAlignment="Center"/>
-                        <TextBlock Grid.Column="3" Grid.Row="4" Text="2-byte len str:"
-                                   HorizontalAlignment="Right" VerticalAlignment="Center"/>
-
-                        <TextBox Name="orgDirectiveTextBox" Grid.Column="4" Grid.Row="0"
+                        <TextBox Name="orgDirectiveTextBox" Grid.Column="5" Grid.Row="0"
                                  VerticalAlignment="Center" Margin="{StaticResource TBS}"
                                  Text=".placeho" MaxLength="12"
                                  FontFamily="{StaticResource GeneralMonoFont}"/>
-                        <TextBox Name="defineData2TextBox" Grid.Column="4" Grid.Row="1"
-                                 VerticalAlignment="Center" Margin="{StaticResource TBS}"
-                                 Text=".placeho" MaxLength="12"
-                                 FontFamily="{StaticResource GeneralMonoFont}"/>
-                        <TextBox Name="strReverseTextBox" Grid.Column="4" Grid.Row="3"
-                                 VerticalAlignment="Center" Margin="{StaticResource TBS}"
-                                 Text=".placeho" MaxLength="12"
-                                 FontFamily="{StaticResource GeneralMonoFont}"/>
-                        <TextBox Name="strLen16TextBox" Grid.Column="4" Grid.Row="4"
-                                 VerticalAlignment="Center" Margin="{StaticResource TBS}"
-                                 Text=".placeho" MaxLength="12"
-                                 FontFamily="{StaticResource GeneralMonoFont}"/>
-
-                        <!-- third column -->
                         <TextBlock Grid.Column="6" Grid.Row="0" Text="Reg width:"
                                    HorizontalAlignment="Right" VerticalAlignment="Center"/>
-                        <TextBlock Grid.Column="6" Grid.Row="1" Text="Three bytes:"
-                                   HorizontalAlignment="Right" VerticalAlignment="Center"/>
-                        <TextBlock Grid.Column="6" Grid.Row="2" Text="Fill:"
-                                   HorizontalAlignment="Right" VerticalAlignment="Center"/>
-                        <TextBlock Grid.Column="6" Grid.Row="3" Text="Null-term str:"
-                                   HorizontalAlignment="Right" VerticalAlignment="Center"/>
-
                         <TextBox Name="regWidthDirectiveTextBox" Grid.Column="7" Grid.Row="0"
                                  VerticalAlignment="Center" Margin="{StaticResource TBS}"
                                  Text=".placeho" MaxLength="12"
                                  FontFamily="{StaticResource GeneralMonoFont}"/>
-                        <TextBox Name="defineData3TextBox" Grid.Column="7" Grid.Row="1"
+
+                        <!-- second row -->
+                        <StackPanel Grid.Column="0" Grid.Row="1" VerticalAlignment="Center">
+                            <TextBlock Text="Little-endian" HorizontalAlignment="Right"/>
+                            <TextBlock Text="data, one byte:" HorizontalAlignment="Right"/>
+                        </StackPanel>
+                        <TextBox Name="defineData1TextBox" Grid.Column="1" Grid.Row="1"
                                  VerticalAlignment="Center" Margin="{StaticResource TBS}"
                                  Text=".placeho" MaxLength="12"
                                  FontFamily="{StaticResource GeneralMonoFont}"/>
-                        <TextBox Name="fillTextBox" Grid.Column="7" Grid.Row="2"
+                        <TextBlock Grid.Column="2" Grid.Row="1" Text="Two bytes:"
+                                   HorizontalAlignment="Right" VerticalAlignment="Center"/>
+                        <TextBox Name="defineData2TextBox" Grid.Column="3" Grid.Row="1"
                                  VerticalAlignment="Center" Margin="{StaticResource TBS}"
                                  Text=".placeho" MaxLength="12"
                                  FontFamily="{StaticResource GeneralMonoFont}"/>
-                        <TextBox Name="strNullTermTextBox" Grid.Column="7" Grid.Row="3"
+                        <TextBlock Grid.Column="4" Grid.Row="1" Text="Three bytes:"
+                                   HorizontalAlignment="Right" VerticalAlignment="Center"/>
+                        <TextBox Name="defineData3TextBox" Grid.Column="5" Grid.Row="1"
+                                 VerticalAlignment="Center" Margin="{StaticResource TBS}"
+                                 Text=".placeho" MaxLength="12"
+                                 FontFamily="{StaticResource GeneralMonoFont}"/>
+                        <TextBlock Grid.Column="6" Grid.Row="1" Text="Four bytes:"
+                                   HorizontalAlignment="Right" VerticalAlignment="Center"/>
+                        <TextBox Name="defineData4TextBox" Grid.Column="7" Grid.Row="1"
                                  VerticalAlignment="Center" Margin="{StaticResource TBS}"
                                  Text=".placeho" MaxLength="12"
                                  FontFamily="{StaticResource GeneralMonoFont}"/>
 
-                        <!-- fourth column -->
-                        <TextBlock Grid.Column="9" Grid.Row="1" Text="Four bytes:"
+                        <!-- third row -->
+                        <StackPanel Grid.Column="0" Grid.Row="2" VerticalAlignment="Center">
+                            <TextBlock Text="Big-endian data," HorizontalAlignment="Right"/>
+                            <TextBlock Text="two bytes:" HorizontalAlignment="Right"/>
+                        </StackPanel>
+                        <TextBox Name="defineBigData2TextBox" Grid.Column="1" Grid.Row="2"
+                                 VerticalAlignment="Center" Margin="{StaticResource TBS}"
+                                 Text=".placeho" MaxLength="12"
+                                 FontFamily="{StaticResource GeneralMonoFont}"/>
+                        <TextBlock Grid.Column="4" Grid.Row="2" Text="Fill:"
                                    HorizontalAlignment="Right" VerticalAlignment="Center"/>
-                        <TextBlock Grid.Column="9" Grid.Row="2" Text="Bulk data:"
-                                   HorizontalAlignment="Right" VerticalAlignment="Center"/>
-                        <TextBlock Grid.Column="9" Grid.Row="3" Text="DCI str:"
+                        <TextBox Name="fillTextBox" Grid.Column="5" Grid.Row="2"
+                                 VerticalAlignment="Center" Margin="{StaticResource TBS}"
+                                 Text=".placeho" MaxLength="12"
+                                 FontFamily="{StaticResource GeneralMonoFont}"/>
+                        <TextBlock Grid.Column="6" Grid.Row="2" Text="Bulk data:"
                                    HorizontalAlignment="Right" VerticalAlignment="Center"/>
+                        <TextBox Name="denseTextBox" Grid.Column="7" Grid.Row="2"
+                                 VerticalAlignment="Center" Margin="{StaticResource TBS}"
+                                 Text=".placeho" MaxLength="12"
+                                 FontFamily="{StaticResource GeneralMonoFont}"/>
 
-                        <TextBox Name="defineData4TextBox" Grid.Column="10" Grid.Row="1"
+                        <!-- fourth row -->
+                        <TextBlock Grid.Column="0" Grid.Row="3" Text="Generic str:"
+                                   HorizontalAlignment="Right" VerticalAlignment="Center"/>
+                        <TextBox Name="strGenericTextBox" Grid.Column="1" Grid.Row="3"
                                  VerticalAlignment="Center" Margin="{StaticResource TBS}"
                                  Text=".placeho" MaxLength="12"
                                  FontFamily="{StaticResource GeneralMonoFont}"/>
-                        <TextBox Name="denseTextBox" Grid.Column="10" Grid.Row="2"
+                        <TextBlock Grid.Column="2" Grid.Row="3" Text="Reverse str:"
+                                   HorizontalAlignment="Right" VerticalAlignment="Center"/>
+                        <TextBox Name="strReverseTextBox" Grid.Column="3" Grid.Row="3"
                                  VerticalAlignment="Center" Margin="{StaticResource TBS}"
                                  Text=".placeho" MaxLength="12"
                                  FontFamily="{StaticResource GeneralMonoFont}"/>
-                        <TextBox Name="strDciTextBox" Grid.Column="10" Grid.Row="3"
+                        <TextBlock Grid.Column="4" Grid.Row="3" Text="Null-term str:"
+                                   HorizontalAlignment="Right" VerticalAlignment="Center"/>
+                        <TextBox Name="strNullTermTextBox" Grid.Column="5" Grid.Row="3"
+                                 VerticalAlignment="Center" Margin="{StaticResource TBS}"
+                                 Text=".placeho" MaxLength="12"
+                                 FontFamily="{StaticResource GeneralMonoFont}"/>
+                        <TextBlock Grid.Column="6" Grid.Row="3" Text="DCI str:"
+                                   HorizontalAlignment="Right" VerticalAlignment="Center"/>
+                        <TextBox Name="strDciTextBox" Grid.Column="7" Grid.Row="3"
+                                 VerticalAlignment="Center" Margin="{StaticResource TBS}"
+                                 Text=".placeho" MaxLength="12"
+                                 FontFamily="{StaticResource GeneralMonoFont}"/>
+
+                        <!-- fifth row -->
+                        <TextBlock Grid.Column="0" Grid.Row="4" Text="1-byte len str:"
+                                   HorizontalAlignment="Right" VerticalAlignment="Center"/>
+                        <TextBox Name="strLen8TextBox" Grid.Column="1" Grid.Row="4"
+                                 VerticalAlignment="Center" Margin="{StaticResource TBS}"
+                                 Text=".placeho" MaxLength="12"
+                                 FontFamily="{StaticResource GeneralMonoFont}"/>
+                        <TextBlock Grid.Column="2" Grid.Row="4" Text="2-byte len str:"
+                                   HorizontalAlignment="Right" VerticalAlignment="Center"/>
+                        <TextBox Name="strLen16TextBox" Grid.Column="3" Grid.Row="4"
                                  VerticalAlignment="Center" Margin="{StaticResource TBS}"
                                  Text=".placeho" MaxLength="12"
                                  FontFamily="{StaticResource GeneralMonoFont}"/>
diff --git a/SourceGen/WpfGui/EditAppSettings.xaml.cs b/SourceGen/WpfGui/EditAppSettings.xaml.cs
index b1ca3db..090bf72 100644
--- a/SourceGen/WpfGui/EditAppSettings.xaml.cs
+++ b/SourceGen/WpfGui/EditAppSettings.xaml.cs
@@ -139,6 +139,7 @@ namespace SourceGen.WpfGui {
             // Map text boxes to PseudoOpName fields.
             mPseudoNameMap = new TextBoxPropertyMap[] {
                 new TextBoxPropertyMap(equDirectiveTextBox, "EquDirective"),
+                new TextBoxPropertyMap(varDirectiveTextBox, "VarDirective"),
                 new TextBoxPropertyMap(orgDirectiveTextBox, "OrgDirective"),
                 new TextBoxPropertyMap(regWidthDirectiveTextBox, "RegWidthDirective"),
                 new TextBoxPropertyMap(defineData1TextBox, "DefineData1"),