Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!sdd.hp.com!decwrl!adobe!heaven!glenn
From: glenn@heaven.woodside.ca.us (Glenn Reid)
Newsgroups: comp.lang.postscript
Subject: Re: Please explain this PostScript problem to me
Keywords: postscript problem mac printing
Message-ID: <224@heaven.woodside.ca.us>
Date: 25 Jul 90 18:53:46 GMT
References: <9815@hubcap.clemson.edu>
Reply-To: glenn@heaven.UUCP (Glenn Reid)
Organization: Skyline Press, Woodside CA
Lines: 28

In article <9815@hubcap.clemson.edu> philip@hubcap.clemson.edu (Philip L Harshman) writes:
   Currently, I am having problems with a statement in the LaserPrep file that
   looks like this:
   
   /fc{save vmstatus exch sub 50000 lt
  {(%%[|0|]%%)=print flush}if pop restore}bdf
    ...
   it works fine, but now I don't know if I'm aiming a gun at my foot for later
   things.  Could some give me some idea as to what this is trying to do and
   if it's OK to make the change I've made?

I'm pretty sure this is used by the LaserWriter driver on the Mac to check
the memory consumption in the printer at various intervals.  I believe the
information is fed back to the driver during the time it's talking to the
printer to help with font downloading memory management issues.

Once the file has been written to disk, there is no point in trying to
communicate this information back to the driver, since the driver isn't
even there any more.  You can safely make the "fc" procedure a no-op,
but you probably shouldn't delete it entirely.  I don't think your foot
will be shot off from the modification you made :-)

(Glenn) cvn

-- 
 Glenn Reid				PostScript/NeXT consultant
 glenn@heaven.woodside.ca.us		Independent Software Developer
 ..{adobe,next}!heaven!glenn		415-851-1785