Hello world!

1 thought on “Hello world!”

• 
  mahdi 4-May-2020, 7:29 AM

  hello
  would you please help me

  I want my function to be executed instead of when the division by 0 issue
  my function is (print_1) that print “M”

  my code is:

  [BITS 16]
  [ORG 7c00h]
  jmp s
  ;******************************
  print_1:
  mov al, ‘M’
  mov ah, 0eh
  int 0x10
  ret
  ;***************************
  s:
  xor ax,ax
  mov ax,0f000
  mov es,ax
  ; for replace my subroutine into address of int0 :
  mov word [es:0eef3h] ,print_1

  ; for divide by zero :
  mov al,92
  sub cl,cl
  div cl

  k: jmp k

  times 510 – ($-$$) db 0
  dw 0xaa55
  ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  the address 0f00:eef3 is in
  int0 or divide by zero is in At the address of 0,1,2,3 of of memory and in my case 0 is “F3” , in 1 is “EE” , in 2 is “00” and in 3 is “F3”

  but it not work.

  of course in masm this is
  mov ax,0000
  mov es,ax
  mov word ptr es:0002, seg print_1
  mov word ptr es:0000, offset print_1

  but it has error for me
  `ptr’ is not a NASM keyword
  comma, colon, decorator or end of line expected after operand
  binary output format does not support segment base references

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