Hi, yes there is one (very good I think) for DOS. Look at www.parallaxinc.com, and look for psim.exe or similar one. Unfortunately, the product is not developed so forth, but is is handy, you can step back (!) during debugging, and it is free. I hope this helps: Imre On Wed, 16 Sep 1998, Engineering Department wrote: > Is there a PIC16C5X DOS or Windoze simulator > (not ICE) available to single step etc. through an > assembly program as a code check? > > Thanks, > > Win Wiencke > Image Logic Corporation > ImageLogic@ibm.net > >