Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!cs.utexas.edu!texbell!chinacat!woody
From: woody@chinacat.Unicom.COM (Woody Baker @ Eagle Signal)
Newsgroups: comp.lang.postscript
Subject: Re: EOF indication to PostScript printer
Summary: welll...
Keywords: file  end  EOF  big secret
Message-ID: <1422@chinacat.Unicom.COM>
Date: 25 Jul 90 04:17:34 GMT
References: <5556@sunquest.UUCP>
Distribution: usa
Organization: a guest of Unicom Systems Development, Austin
Lines: 33

In article <5556@sunquest.UUCP>, terry@sunquest.UUCP (Terry Friedrichsen) writes:
> Help!  I've R'ed The FM's until my blood pressure won't take it any more.
> 
> I have a QMS PS-810 PostScript laser printer, and the green, blue, and red
> Adobe PostScript books, as well as the book for the QMS itself.  I've even
> opened all four books.
> 
> EVERY ONE of them talks about what happens when the printer "receives an
> EOF indication" (we use the serial interface), and you can even find
> example PostScript code to detect it.  All the books then blithely continue
> the narrative, as if they have revealed all, and you are therefore ready
> to proceed to the next topic.
> 
> NONE of the blasted books tell me what in bloody blue (green, red) blazes
> to SEND DOWN THE SERIAL LINE to give the printer this mystical, magical
> "EOF indication"!!!  What is the big secret here, anyway?  I'm an adult;

I've looked for it in vain also.  For a fact, ^D i.e. 0x04 will terminate
a job, but I'm not sure about the EOF.  I have a postscript PS-810 also.
I wrote a diablo emulator, as well as a simple epson emulator.  I finaly
took the approach of taking the CAN character (clear buffer  on an Epson)
and used it to drop into postscript so that I can escape the emulator,
drop into postscript, do things, then get back into the emualtor.  That 
worked fairly well.  If you invoke the HP emulation mode from software
(hplj ) you can toggle back to postscript with a ^D.  Adobe orginaly
told me that it was  0x7f 0x4  but I found that the 0x7f was not needed.
Since they are manipulating the port transparently, they check for ^D
outside of a graphics string and quit.

Cheers
Woody

I don't think it's an elementary question at all...