diff --git a/SourceGen/AppSettings.cs b/SourceGen/AppSettings.cs
index ffa79cf..47d33b3 100644
--- a/SourceGen/AppSettings.cs
+++ b/SourceGen/AppSettings.cs
@@ -129,6 +129,7 @@ namespace SourceGen {
         public const string SRCGEN_ADD_IDENT_COMMENT = "srcgen-add-ident-comment";
         public const string SRCGEN_LABEL_NEW_LINE = "srcgen-label-new-line";
         public const string SRCGEN_SHOW_CYCLE_COUNTS = "srcgen-show-cycle-counts";
+        public const string SRCGEN_OMIT_IMPLIED_ACC_OPERAND = "srcgen-omit-implied-acc-operand";
 
         // Label file generation settings.
         public const string LABGEN_FORMAT = "labgen-format";
diff --git a/SourceGen/AsmGen/AsmAcme.cs b/SourceGen/AsmGen/AsmAcme.cs
index c358fc8..a280f1a 100644
--- a/SourceGen/AsmGen/AsmAcme.cs
+++ b/SourceGen/AsmGen/AsmAcme.cs
@@ -230,7 +230,7 @@ namespace SourceGen.AsmGen {
         /// Configures the assembler-specific format items.
         /// </summary>
         private void SetFormatConfigValues(ref Formatter.FormatConfig config) {
-            config.SuppressImpliedAcc = true;
+            config.SuppressImpliedAcc = true;       // implied acc not allowed
 
             config.OperandWrapLen = 64;
             config.ForceDirectOpcodeSuffix = "+1";
diff --git a/SourceGen/AsmGen/GenCommon.cs b/SourceGen/AsmGen/GenCommon.cs
index 3603bf6..51f69d8 100644
--- a/SourceGen/AsmGen/GenCommon.cs
+++ b/SourceGen/AsmGen/GenCommon.cs
@@ -512,6 +512,8 @@ namespace SourceGen.AsmGen {
                 settings.GetBool(AppSettings.FMT_ADD_SPACE_FULL_COMMENT, true);
             config.OperandWrapLen =
                 settings.GetInt(AppSettings.FMT_OPERAND_WRAP_LEN, 0);
+            config.SuppressImpliedAcc =
+                settings.GetBool(AppSettings.SRCGEN_OMIT_IMPLIED_ACC_OPERAND, false);
 
             config.ForceAbsOpcodeSuffix =
                 settings.GetString(AppSettings.FMT_OPCODE_SUFFIX_ABS, string.Empty);
diff --git a/SourceGen/MainController.cs b/SourceGen/MainController.cs
index 76141a1..790e653 100644
--- a/SourceGen/MainController.cs
+++ b/SourceGen/MainController.cs
@@ -508,6 +508,8 @@ namespace SourceGen {
                 settings.GetString(AppSettings.FMT_LOCAL_VARIABLE_PREFIX, string.Empty);
             mFormatterConfig.CommaSeparatedDense =
                 settings.GetBool(AppSettings.FMT_COMMA_SEP_BULK_DATA, true);
+            mFormatterConfig.SuppressImpliedAcc =
+                settings.GetBool(AppSettings.SRCGEN_OMIT_IMPLIED_ACC_OPERAND, false);
             mFormatterConfig.DebugLongComments = DebugLongComments;
 
             string chrDelCereal = settings.GetString(AppSettings.FMT_CHAR_DELIM, null);
diff --git a/SourceGen/Tests/GenTest.cs b/SourceGen/Tests/GenTest.cs
index 02a3051..4c6c42b 100644
--- a/SourceGen/Tests/GenTest.cs
+++ b/SourceGen/Tests/GenTest.cs
@@ -456,6 +456,8 @@ namespace SourceGen.Tests {
             // This could be on or off.  Off seems less distracting.
             settings.SetBool(AppSettings.SRCGEN_SHOW_CYCLE_COUNTS, false);
 
+            settings.SetBool(AppSettings.SRCGEN_OMIT_IMPLIED_ACC_OPERAND, false);
+
             IEnumerator<AssemblerInfo> iter = AssemblerInfo.GetInfoEnumerator();
             while (iter.MoveNext()) {
                 AssemblerInfo.Id asmId = iter.Current.AssemblerId;
diff --git a/SourceGen/WpfGui/EditAppSettings.xaml b/SourceGen/WpfGui/EditAppSettings.xaml
index 28b39b4..7590d30 100644
--- a/SourceGen/WpfGui/EditAppSettings.xaml
+++ b/SourceGen/WpfGui/EditAppSettings.xaml
@@ -845,6 +845,8 @@ limitations under the License.
                                       IsChecked="{Binding ShowCycleCountsAsm}"/>
                             <CheckBox Content="Identify assembler in output" Margin="0,4,0,0"
                                       IsChecked="{Binding AddIdentComment}"/>
+                            <CheckBox Content="Omit implied accumulator operands if allowed" Margin="0,4,0,0"
+                                      IsChecked="{Binding OmitImpliedAccOperand}"/>
                             <StackPanel Orientation="Vertical" Margin="0,6,0,0">
                                 <TextBlock Text="Put labels on their own line..."/>
                                 <RadioButton GroupName="labelLineGroup" Margin="4,4,0,0"
diff --git a/SourceGen/WpfGui/EditAppSettings.xaml.cs b/SourceGen/WpfGui/EditAppSettings.xaml.cs
index a60cc5a..bb3a906 100644
--- a/SourceGen/WpfGui/EditAppSettings.xaml.cs
+++ b/SourceGen/WpfGui/EditAppSettings.xaml.cs
@@ -803,6 +803,14 @@ namespace SourceGen.WpfGui {
                 IsDirty = true;
             }
         }
+        public bool OmitImpliedAccOperand {
+            get { return mSettings.GetBool(AppSettings.SRCGEN_OMIT_IMPLIED_ACC_OPERAND, false); }
+            set {
+                mSettings.SetBool(AppSettings.SRCGEN_OMIT_IMPLIED_ACC_OPERAND, value);
+                OnPropertyChanged();
+                IsDirty = true;
+            }
+        }
 
         // label placement radio buttons
         public bool LabelPlacement_PreferSameLine {
diff --git a/docs/sgmanual/settings.html b/docs/sgmanual/settings.html
index a38deb4..467b9ed 100644
--- a/docs/sgmanual/settings.html
+++ b/docs/sgmanual/settings.html
@@ -214,7 +214,7 @@ not hard stops: if the contents of a field are too wide, the contents
 of the next column will be pushed over.  (The comment field width is
 not currently being used, but may be used to fold lines in the future.)</p>
 
-<p>The Code Generation Settings affect all assemblers.</p>
+<p>The next section, Code Generation Settings, affects all assemblers.</p>
 
 <p>When <samp>show cycle counts in comments</samp> is checked, cycle
 counts are inserted into end-of-line comments.  This works the same as
@@ -229,6 +229,15 @@ file is sent to other people, since it may not otherwise be obvious from
 the source file what the intended target assembler is, or what options
 are required to process the file correctly.</p>
 
+<p>Some 6502 instructions have an "implied" accumulator address mode, e.g.
+<code>LSR</code> and <code>ASL</code>.  The operand may be shown as
+"<code>A</code>" to make the address mode explicit, but it can also be
+omitted.  Some assemblers require it to be present, some require it to be
+absent, most allow either.  By default, the operand is shown, but enabling
+<samp>omit implied accumulator operands if allowed</samp> will cause it to
+be omitted on-screen, in the instruction chart, and in source generated for
+assemblers that don't require it to be present.</p>
+
 <p>Labels can generally be placed either on the same line as a code or data
 operand, or on the line before it.  Placing them on the same line makes
 the output a bit more compact, but if the label is longer than the label