macro BootCode makeInstaller
{
local ..bootCode
    if 1

    macro ends
    \{
    end if
        if $ - 7c00h > 510
             display "Boot code exceeds 510 bytes"
             err
        end if

        rb 510 - ($ - 7c00h)
        dw 0aa55h
    \}

    struc IntHandler origin
    \{
    .:
    org origin
        if 1
        macro ends
        \\{
        end if

        org $ - origin + .

        purge ends
        \\}
    \}


match makeInstaller, any
\{
    match `makeInstaller, "makeInstaller"
    \\{
    org 100h
        mov     ax, 0301h
        mov     bx, ..bootCode
        mov     cx, 1
        xor     dx, dx
        int     13h

        jc      .writeError
        int     20h

    .writeError:
        mov     ah, 09h
        mov     dx, errorMsg
        int     21h
        xor     ax, ax
        int     16h
        int     20h

    errorMsg    db "Write error", "$"
    \\}
\}

..bootCode:
org 7c00h
}
    

BootCode

  int13 IntHandler

  ends ; Here it's used "ends" from IntHandler

ends ; Again it's used "ends" from IntHandler    

BootCode

  int13 IntHandler 0

  ends ; Here it's used "ends" from IntHandler
  purge ends

ends ; Illegal instruction!!
end if