.MODEL Directive Language Parameter Doesn't Preserve Case

• Microsoft Macro Assembler for MS-DOS, versions 5.1 and 5.1a
• Microsoft Macro Assembler for OS/2, versions 5.1 and 5.1a

The .MODEL directive can be followed by a language parameter that determines naming, calling, and returning conventions that are used by the specified language. The example below demonstrates the syntax.

Although the language type determines the naming convention, it does not determine the case of any names used. For example if the statement ".MODEL SMALL, C" is used, case sensitivity of names is not preserved, even though C preserves case by default. However, an underscore is added in front of any names. Similarly, if the statement ".MODEL SMALL, PASCAL" is used in a program, all names are not forced to uppercase (the default for Pascal).

To ensure proper case sensitivity, use the command line option /MX (preserves case in public and external names), /MU (converts names to uppercase), or /ML (preserves case in names).

Sample Code

   .model small,c ; <--- Language specifier
   .code

   myproc proc
          ret
   end