text: #######CONSTANTS########
  #system call numbers
  
      .equ SYS_READ, 0
      .equ SYS_WRITE, 1
      .equ SYS_OPEN, 2
      .equ SYS_CLOSE, 3
      .equ SYS_EXIT, 60
      .equ SYS_BRK, 12
  
      .equ O_RDONLY, 0
      .equ O_CREAT_WRONLY_TRUNC, 03101
      
  #standard file descriptors
      .equ STDIN, 0
      .equ STDOUT, 1
      .equ STDERR, 2
      
      .equ END_OF_FILE, 0  
      
  