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Message: [QUOTE="Shannon, post: 3556174"] My finished version: FUNCTION char_to_slv (c : CHARACTER) RETURN STD_LOGIC_VECTOR IS variable Return_Value : STD_LOGIC_VECTOR(7 downto 0); BEGIN case c is when '0' => Return_Value := STD_LOGIC_VECTOR(TO_UNSIGNED(0,8)); when '1' => Return_Value := STD_LOGIC_VECTOR(TO_UNSIGNED(1,8)); when '2' => Return_Value := STD_LOGIC_VECTOR(TO_UNSIGNED(2,8)); when '3' => Return_Value := STD_LOGIC_VECTOR(TO_UNSIGNED(3,8)); when '4' => Return_Value := STD_LOGIC_VECTOR(TO_UNSIGNED(4,8)); when '5' => Return_Value := STD_LOGIC_VECTOR(TO_UNSIGNED(5,8)); when '6' => Return_Value := STD_LOGIC_VECTOR(TO_UNSIGNED(6,8)); when '7' => Return_Value := STD_LOGIC_VECTOR(TO_UNSIGNED(7,8)); when '8' => Return_Value := STD_LOGIC_VECTOR(TO_UNSIGNED(8,8)); when '9' => Return_Value := STD_LOGIC_VECTOR(TO_UNSIGNED(9,8)); when '-' => Return_Value := STD_LOGIC_VECTOR(TO_UNSIGNED(45,8)); when others => Return_Value := (OTHERS => '1'); end case; Later I will add the lowercase letters but this gets me through the day. Thanks for you help everyone. Mike -- Your answers are always amazing to me. You find super compact ways of doing clever things. I confess I don't understand your version this time but as usual, I will synthesize it and look at the RTL viewer to see how yours does the same thing as mine in a tenth the number of lines! Shannon return(Return_Value); END char_to_slv; [/QUOTE]