Path: utzoo!attcan!uunet!lll-winken!lll-tis!helios.ee.lbl.gov!pasteur!agate!labrea!decwrl!decvax!tektronix!sequent!ccssrv!ccsrd11!rob
From: rob@ccsrd11.UUCP (Rob Sleator)
Newsgroups: comp.lang.postscript
Subject: Re: How to access the VM image in a PostScript printer
Summary: renderbands not inplemented on framedevices
Message-ID: <212@ccsrd11.UUCP>
Date: 9 Dec 88 18:48:27 GMT
References: <4337@pbhyf.PacBell.COM> <1657@basser.oz> <80342@sun.uucp>
Reply-To: rob@ccssrv.UUCP (Robert Sleator)
Organization: Control-C Software, Inc., Beaverton, OR
Lines: 16

In article <80342@sun.uucp> sears@sun.uucp (Daniel Sears) writes:

>read the contents of the frame buffer in a printer.  There is a PostScript
>operator that does just this: renderbands.  LaserTalk (from Emerald City
>Software) uses this operator to read back the contents of the frame buffer
>in a PostScript printer to preview an image.  [...]
>It is part of the PostScript language design and is available
>in every printer that includes a frame buffer ...
>
>--Dan


Renderbands is only implemented on banddevice printers.  The LaserWriter and 
similar printers use frame buffers.  LaserTalk does not use renderbands but
downloads an operator called rdbytes with the eexec operator.

					Robert Sleator