From: YO2IS
  Dear Rik, thanks for your message and idea.
 The QRSS 4.08 was instaled on my PC shortly after you have
released it !. Unfortunately had never built the interface.
 Now am ready to do that using a free paralel port and two
optocouplers found in my junkbox.
 Will not abandon the alternative idea and write the DFCW
subroutine for the SM6LKM keyer.
 Once more THANKS !.
    73 Szigy.