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     The Source Display Mode (S) command sets one of three modes in
     which code is displayed:
 
     Mode         Command     Program Display
 
     Source       S+          Source lines
 
     Assembly     S-          Assembly-language instructions
 
     Mixed        S&          Both source lines and assembly-language
                              instructions
 
     With no argument (S), the command displays the current mode:
     Source, Assembly, or Mixed.
 
     CodeView outputs the name of the new display mode: Source,
     Assembly, or Mixed.
 
     Source and Mixed modes are only available if the executable file
     contains symbols in the CodeView format. To include these
     symbols, you must compile and link programs as shown below:
 
        ■ For PWB: Choose the Debug Build or Release Build command
          from the Options menu, and select the CodeView option
          in the Debug Info box.
 
        ■ On the compiler command line: Compile with the /Zi option.
 
     NOTE: Programs that do not contain symbolic information are
           displayed in Assembly mode.
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