'How do I compile my 16 bit Mac assembly code?

So I'm trying to assemble this piece of 16bit assembly code on my Mac (Monterey):

    global _main

    section     .text

_main:
    mov ah, 0x0e
    mov al, '!'
    int 0x10

    mov  ah, 0x4c
    int  0x21

I am using the NASM assembler, and have so far managed to get it assembled into a .com file using the following command:

nasm testing.asm -o test.com -f bin

However when trying to link this into an executable using LD with the following command:

ld -e _main -static -o test test.com -arch x86_64

it comes up with the error:

standing-x86_64 but attempting to link with file built for
unknown-unsupported file format ( 0xB4 0x0E 0xB0 0x21 0xCD 0x10 0xB7
0x0E 0xB5 0x0E 0xB6 0x0E 0xBE 0x0E 0x00 0xBF ) Undefined symbols for
architecture x86_64:   "_main", referenced from:
     -u command line option ld: symbol(s) not found for architecture x86_64 ```

Does anyone know how to fix this?

macosassemblynasm16-bit


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