GNU Info

(nasm.info)Section 2.2.5

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2.2.5. NASM Doesn't Support Memory Models
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   NASM also does not have any directives to support different 16-bit
memory models. The programmer has to keep track of which functions are
supposed to be called with a far call and which with a near call, and
is responsible for putting the correct form of `RET' instruction
(`RETN' or `RETF'; NASM accepts `RET' itself as an alternate form for
`RETN'); in addition, the programmer is responsible for coding CALL FAR
instructions where necessary when calling _external_ functions, and
must also keep track of which external variable definitions are far and
which are near.