; mac1.asm
; macro with a default parameter,
; also calling a macro within  macro definition
;                Celio G. May 2002

org 100h         ; inform Nasm this is a .com file
                 ; int 21h is going to want...
%macro showmsg 1
mov dx, %1       ; the address of or message in dx
mov ah,9         ; ah=9 - "print string" sub-function
int 21h          ; call dos services
%ENDMACRO

%macro die 0-1 msg2
  showmsg %1
%endmacro
die
die msg

mov ah,4Ch       ; "terminate program" sub-function
int 21h          ; call dos services

msg db 'Hello, World!',0Dh,0Ah,'$'   ; $-terminated message
msg2 db 'No parameters in this macro call...',0dh,0ah,'$'