diff --git a/ibcp.h b/ibcp.h
index e8b19dc..4d8d667 100644
--- a/ibcp.h
+++ b/ibcp.h
@@ -303,12 +303,17 @@ enum class DataType
 // sub-code flags for use in Token and internal program
 enum SubCode : uint16_t
 {
-	None_SubCode		= 0x0000,	// no sub-code present
 	ProgramMask_SubCode	= 0xFC00,	// mask for actual program sub-codes
-	Paren_SubCode		= 0x0400,	// reproduce unnecessary parenthesis
-	Colon_SubCode		= 0x0800,	// reproduce ":" after token
+	Paren_SubCode		= 0x0400,	// recreate unnecessary parenthesis
+	Colon_SubCode		= 0x0400,	// recreate ":" after token
+	Unused3_SubCode		= 0x0800,	// unused option
+	// note: Paren for operators, Colon for commands
 	Option_SubCode		= 0x1000,	// reproduce command specific option
-	// sub-codes used by translator only
+	// note: command option for INPUT/INPUT PROMPT ('Keep')
+	//       command option for InputBeginStr ('Question')
+	//       recreate 'LET' on assignments
+	Unused2_SubCode		= 0x2000,	// unused option
+	Unused1_SubCode		= 0x4000,	// unused option
 	Double_SubCode		= 0x8000,	// integer constant has decimal/exponent
 	// note: for constants in translator only (not encoded in program)
 	//       recreate '#' on double identifiers
diff --git a/programcode.h b/programcode.h
index 77d1abd..be79766 100644
--- a/programcode.h
+++ b/programcode.h
@@ -49,7 +49,7 @@ class ProgramWord
 	{
 		return SubCode(m_word & ProgramMask_SubCode);
 	}
-	bool instructionHasSubCode(int subCode) const
+	bool instructionHasSubCode(SubCode subCode) const
 	{
 		return (m_word & subCode) != 0;
 	}
diff --git a/programmodel.cpp b/programmodel.cpp
index d050cbc..159d6d0 100644
--- a/programmodel.cpp
+++ b/programmodel.cpp
@@ -46,7 +46,9 @@ std::ostream &operator<<(std::ostream &os, ProgramWord word)
 	if (word.instructionHasSubCode(ProgramMask_SubCode))
 	{
 		os << '\'';
-		if (word.instructionHasSubCode(Paren_SubCode))
+		bool command = table.type(code) == Token::Type::Command
+			|| table.hasFlag(code, Command_Flag);
+		if (!command && word.instructionHasSubCode(Paren_SubCode))
 		{
 			os << ')';
 		}
@@ -55,7 +57,7 @@ std::ostream &operator<<(std::ostream &os, ProgramWord word)
 			std::string option {table.optionName(code)};
 			os << (option.empty() ? "BUG" : option);
 		}
-		if (word.instructionHasSubCode(Colon_SubCode))
+		if (command && word.instructionHasSubCode(Colon_SubCode))
 		{
 			os << ":";
 		}
diff --git a/recreator.cpp b/recreator.cpp
index 0f730e9..69fdb11 100644
--- a/recreator.cpp
+++ b/recreator.cpp
@@ -52,11 +52,13 @@ std::string Recreator::operator()(const RpnList &rpnList, bool exprMode)
 		{
 			recreate(*this, rpnItem);
 		}
-		if (rpnItem->token()->hasSubCode(Paren_SubCode))
+		bool command = rpnItem->token()->isType(Token::Type::Command)
+			|| m_table.hasFlag(rpnItem->token(), Command_Flag);
+		if (!command && rpnItem->token()->hasSubCode(Paren_SubCode))
 		{
 			parenRecreate(*this, rpnItem);
 		}
-		if (rpnItem->token()->hasSubCode(Colon_SubCode))
+		if (command && rpnItem->token()->hasSubCode(Colon_SubCode))
 		{
 			// FLAG option: spaces before colons (default=no)
 			m_output += ':';
diff --git a/table.cpp b/table.cpp
index 0cc515f..46cce69 100644
--- a/table.cpp
+++ b/table.cpp
@@ -663,13 +663,13 @@ static TableEntry tableEntries[] =
 	{	// Comma_Code
 		Token::Type::Operator,
 		",", "", "",
-		TableFlag{}, 6, &Null_ExprInfo,
+		Command_Flag, 6, &Null_ExprInfo,
 		NULL, NULL, NULL, NULL, printCommaRecreate
 	},
 	{	// SemiColon_Code
 		Token::Type::Operator,
 		";", "", "",
-		TableFlag{}, 6, &Null_ExprInfo,
+		Command_Flag, 6, &Null_ExprInfo,
 		NULL, NULL, NULL, NULL, printSemicolonRecreate
 	},
 	{	// Colon_Code
@@ -691,37 +691,37 @@ static TableEntry tableEntries[] =
 	{	// Assign_Code
 		Token::Type{},
 		"=", "Assign", "LET",
-		Reference_Flag, 4, &Dbl_Dbl_ExprInfo,
+		Reference_Flag | Command_Flag, 4, &Dbl_Dbl_ExprInfo,
 		NULL, NULL, NULL, NULL, assignRecreate
 	},
 	{	// AssignInt_Code
 		Token::Type{},
 		"=", "Assign%", "LET",
-		Reference_Flag, 4, &Int_Int_ExprInfo,
+		Reference_Flag | Command_Flag, 4, &Int_Int_ExprInfo,
 		NULL, NULL, NULL, NULL, assignRecreate
 	},
 	{	// AssignStr_Code
 		Token::Type{},
 		"=", "Assign$", "LET",
-		Reference_Flag, 4, &Str_Str_ExprInfo,
+		Reference_Flag | Command_Flag, 4, &Str_Str_ExprInfo,
 		NULL, NULL, NULL, NULL, assignStrRecreate
 	},
 	{	// AssignLeft_Code
 		Token::Type{},
 		"LEFT$(", "Assign", "LET",
-		Reference_Flag | SubStr_Flag, 4, &Str_StrInt_ExprInfo,
+		Reference_Flag | SubStr_Flag | Command_Flag, 4, &Str_StrInt_ExprInfo,
 		NULL, NULL, NULL, NULL, assignStrRecreate
 	},
 	{	// AssignMid2_Code
 		Token::Type{},
 		"MID$(", "Assign2", "LET",
-		Reference_Flag | SubStr_Flag, 4, &Str_StrInt_ExprInfo,
+		Reference_Flag | SubStr_Flag | Command_Flag, 4, &Str_StrInt_ExprInfo,
 		NULL, NULL, NULL, NULL, assignStrRecreate
 	},
 	{	// AssignMid3_Code
 		Token::Type{},
 		"MID$(", "Assign3", "LET",
-		Reference_Flag | SubStr_Flag | Multiple_Flag, 4, &Str_StrIntInt_ExprInfo,
+		Reference_Flag | SubStr_Flag | Command_Flag, 4, &Str_StrIntInt_ExprInfo,
 		NULL, NULL, NULL, NULL, assignStrRecreate
 	},
 	{	// AssignRight_Code
@@ -733,19 +733,19 @@ static TableEntry tableEntries[] =
 	{	// AssignList_Code
 		Token::Type{},
 		"=", "AssignList", "LET",
-		Reference_Flag, 4, &Dbl_Dbl_ExprInfo,
+		Reference_Flag | Command_Flag, 4, &Dbl_Dbl_ExprInfo,
 		NULL, NULL, NULL, NULL, assignRecreate
 	},
 	{	// AssignListInt_Code
 		Token::Type{},
 		"=", "AssignList%", "LET",
-		Reference_Flag, 4, &Int_Int_ExprInfo,
+		Reference_Flag | Command_Flag, 4, &Int_Int_ExprInfo,
 		NULL, NULL, NULL, NULL, assignRecreate
 	},
 	{	// AssignListStr_Code
 		Token::Type{},
 		"=", "AssignList$", "LET",
-		Reference_Flag, 4, &Str_Str_ExprInfo,
+		Reference_Flag | Command_Flag, 4, &Str_Str_ExprInfo,
 		NULL, NULL, NULL, NULL, assignRecreate
 	},
 	{	// AssignKeepStr_Code
@@ -769,8 +769,7 @@ static TableEntry tableEntries[] =
 	{	// AssignKeepMid3_Code
 		Token::Type{},
 		"MID$(", "AssignKeep3", "LET",
-		Reference_Flag | SubStr_Flag | Multiple_Flag | Keep_Flag, 4,
-		&Str_StrStrInt_ExprInfo,
+		Reference_Flag | SubStr_Flag | Keep_Flag, 4, &Str_StrStrInt_ExprInfo,
 		NULL, NULL, NULL, NULL, assignStrRecreate
 	},
 	{	// AssignKeepRight_Code
diff --git a/table.h b/table.h
index 7ed7a51..d69c8a0 100644
--- a/table.h
+++ b/table.h
@@ -46,6 +46,7 @@ enum TableFlag : unsigned
 	UseConstAsIs_Flag   = 1u << 5,	// use constant data type as is
 	Keep_Flag			= 1u << 6,	// sub-string keep assignment
 	Two_Flag			= 1u << 7,	// code can have two words or characters
+	Command_Flag		= 1u << 8,	// operator code is really a command
 	EndStmt_Flag		= 1u << 31	// end statement
 };
 
diff --git a/test_ibcp.cpp b/test_ibcp.cpp
index 473092a..b7f8bc1 100644
--- a/test_ibcp.cpp
+++ b/test_ibcp.cpp
@@ -126,7 +126,9 @@ std::ostream &operator<<(std::ostream &os, const TokenPtr &token)
 	if (token->hasSubCode())
 	{
 		os << '\'';
-		if (token->hasSubCode(Paren_SubCode))
+		bool command = token->isType(Token::Type::Command)
+			|| table.hasFlag(token, Command_Flag);
+		if (!command && token->hasSubCode(Paren_SubCode))
 		{
 			os << ')';
 		}
@@ -142,7 +144,7 @@ std::ostream &operator<<(std::ostream &os, const TokenPtr &token)
 				os << option;
 			}
 		}
-		if (token->hasSubCode(Colon_SubCode))
+		if (command && token->hasSubCode(Colon_SubCode))
 		{
 			os << ':';
 		}
diff --git a/token.cpp b/token.cpp
index d42450b..9f97649 100644
--- a/token.cpp
+++ b/token.cpp
@@ -60,13 +60,13 @@ Token::Token(int column, int length, const std::string string, double value,
 	{
 		m_dataType = DataType::Integer;
 		// 'double' if decimal pointer present
-		m_subCode = decimal ? Double_SubCode : None_SubCode;
+		m_subCode = decimal ? Double_SubCode : SubCode{};
 		m_valueInt = value;  // convert to integer in case needed
 	}
 	else  // number can't be converted to integer
 	{
 		m_dataType = DataType::Double;
-		m_subCode = None_SubCode;  // ignore sub-code argument
+		m_subCode = {};  // ignore sub-code argument
 	}
 }
 
diff --git a/token.h b/token.h
index f093085..8237ad3 100644
--- a/token.h
+++ b/token.h
@@ -66,10 +66,8 @@ class Token
 	Token(int column, int length, const std::string string, int value) :
 		m_column{column}, m_length{length}, m_type{Token::Type::Constant},
 		m_dataType{DataType::Integer}, m_string{string}, m_code{Invalid_Code},
-		m_reference{}, m_subCode{None_SubCode}, m_valueInt{value}
-	{
-		m_value = value;  // convert to double in case needed
-	}
+		m_reference{}, m_subCode{}, m_value(value), /*convert*/
+		m_valueInt{value} {}
 
 	// constructor for double constants
 	Token(int column, int length, const std::string string, double value,
@@ -79,7 +77,7 @@ class Token
 	Token(int column, int length, const std::string string) : m_column{column},
 		m_length{length}, m_type{Token::Type::Constant},
 		m_dataType{DataType::String}, m_string{string}, m_code{Invalid_Code},
-		m_reference{}, m_subCode{None_SubCode} {}
+		m_reference{}, m_subCode{} {}
 
 	Token(const Token &token)  // copy constructor
 	{
@@ -185,19 +183,19 @@ class Token
 	{
 		return m_subCode;
 	}
-	bool hasSubCode(int subCode) const
+	bool hasSubCode(SubCode subCode) const
 	{
 		return m_subCode & subCode;
 	}
-	void addSubCode(int subCode)
+	void addSubCode(SubCode subCode)
 	{
 		m_subCode |= subCode;
 	}
-	void removeSubCode(int subCode)
+	void removeSubCode(SubCode subCode)
 	{
 		m_subCode &= ~subCode;
 	}
-	int subCodes(void) const
+	uint16_t subCodes(void) const
 	{
 		return m_subCode;
 	}
@@ -260,7 +258,7 @@ class Token
 	std::string m_string;	// pointer to string of token
 	Code m_code;			// internal code of token (index of TableEntry)
 	bool m_reference;		// token is a reference flag
-	int m_subCode;			// sub-code flags of token
+	uint16_t m_subCode;		// sub-code flags of token
 	double m_value;			// double value for constant token
 	int m_valueInt;			// integer value for constant token (if possible)
 	int m_index;			// index within encoded program code line