title: Using COM port 8086 Assembly
body: <p>I am trying to send data over the COM port using assembly language. I am using DOSBOX on windows to allow running 16 bit applications. I am also using MASM 5.1. Windows shows me that my first COM port is at 03F8H. I used INT 14H with 0 assigned to DX nothing was sent, Tried assigning 03F8H to the DX but it was no good.</p>
  
  <pre><code>MOV DX,0H
  MOV AL,'1'
  MOV AH,01H
  INT 14H
  MOV AH,4CH
  INT 21H
  </code></pre>
  
  <p>After setting DOSBOX's serial port to the direct one it just set all the lines to 0 </p>