GNU Info

(nasm.info)Section 6.2.3

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6.2.3. `UPPERCASE': Disabling Case Sensitivity in Output
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   Although NASM itself is case sensitive, some OMF linkers are not;
therefore it can be useful for NASM to output single-case object files.
The `UPPERCASE' format-specific directive causes all segment, group and
symbol names that are written to the object file to be forced to upper
case just before being written. Within a source file, NASM is still
case- sensitive; but the object file can be written entirely in upper
case if desired.

   `UPPERCASE' is used alone on a line; it requires no parameters.