Body: <p>I am trying to get an old RCX working with leJOS. I already have it working with NQC and BricxCC.</p>
  
  <p>While NCQ/BricxCC seems to recognize my usb-to-serial (which appears as "COM5" to the OS), the leJOS I downloaded does not. I believe that it uses <a href="http://jlog.org/rxtx-win.html" rel="nofollow">Java rxtx</a> on Windows to access the serial port.</p>
  
  <p>There seems to be a number of pieces I will need to get into place to make it work.  </p>
  
  <p>I am running Windows 7 professional Version 6.1 (Build 7601:Service Pack 1) on my work laptop (I have OS X on the desktop at home - I suppose I could boot to Linux from a USB or CD on my work machine if I really needed to.)</p>
  
  <p>If I stick with Windows 7 I will need a version of the RXTX DLL which works with:</p>
  
  <ol>
  <li>this version of Windows</li>
  <li>my COM5 port (which is really usb-to-serial).  </li>
  </ol>
  
  <p>I also need a version of Java which works with the leJOS java source code, (found some references that not all JVM versions work) and that version of RXTX/DLL and the RCX (not the NXT...I don't own one).</p>
  
  <p>Alternatively I figure I can upload the leJOS firmware with NQC, but after an hour of trying different searches on the internet I can not find the location/name of the firmware file, or build instructions.</p>
  
  <p>The leJOS forum looks like no-one has posted to the RCX section since 2014, so I thought I might try here.</p>
  
  <p>I'd prefer a Windows 7 solution (as that is where BricxCC and NCQ live now), but I would be willing to consider alternatives if no Windows 7 solution exists.</p>
  
Tags: <mindstorms><software><rcx><lejos>
Title: RCX + java + usb-to-serial
UserDisplayName: Fenn
ThreadText: # RCX + java + usb-to-serial
  
  (Asked by: username_0 on 2015-04-04)
  
  I am trying to get an old RCX working with leJOS. I already have it working with NQC and BricxCC.
  
  While NCQ/BricxCC seems to recognize my usb-to-serial (which appears as "COM5" to the OS), the leJOS I downloaded does not. I believe that it uses [Java rxtx](http://jlog.org/rxtx-win.html) on Windows to access the serial port.
  
  There seems to be a number of pieces I will need to get into place to make it work.
  
  I am running Windows 7 professional Version 6.1 (Build 7601:Service Pack 1) on my work laptop (I have OS X on the desktop at home - I suppose I could boot to Linux from a USB or CD on my work machine if I really needed to.)
  
  If I stick with Windows 7 I will need a version of the RXTX DLL which works with:
  
  1. this version of Windows
  2. my COM5 port (which is really usb-to-serial).
  
  I also need a version of Java which works with the leJOS java source code, (found some references that not all JVM versions work) and that version of RXTX/DLL and the RCX (not the NXT...I don't own one).
  
  Alternatively I figure I can upload the leJOS firmware with NQC, but after an hour of trying different searches on the internet I can not find the location/name of the firmware file, or build instructions.
  
  The leJOS forum looks like no-one has posted to the RCX section since 2014, so I thought I might try here.
  
  I'd prefer a Windows 7 solution (as that is where BricxCC and NCQ live now), but I would be willing to consider alternatives if no Windows 7 solution exists.
  
  **Tags:** mindstorms, software, rcx, lejos
  
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  ## 0 answers
  
  