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This is a well-known problem of NASM's preprocessor. You can't pass a define name to operate on to an mmacro, if the define is possibly defined already, because the mmacro parameter expansion (%1 and ...

len_m, dest1_m, etc. do not represent any register. In NASM, they are just macro arguments/symbols, not predefined names. In your snippet, SLDR and SSTR are empty macros, so those parameters are ...

very good answer,I have corrected the code and avoid the question above ; The Unreal Mode testing program ; For testing in the Bochs emulator ; NASM Syntax org 0x7c00 ; BIOS ...

but when it continue, the CPU should switch to real mode, but I found it still running 32 bits code, which cause the error Indeed it is. Interestingly, it does switch to real mode yet it still runs ...