Path: utzoo!utgpu!water!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!mailrus!ames!pasteur!ucbvax!decwrl!decvax!tektronix!tekcae!vice!keithl
From: keithl@vice.TEK.COM (Keith Lofstrom)
Newsgroups: comp.lang.postscript
Subject: Re: Postscript scaling off
Message-ID: <2545@vice.TEK.COM>
Date: 22 May 88 22:39:38 GMT
References: <9101@ames.arc.nasa.gov>
Reply-To: keithl@vice.UUCP (Keith Lofstrom)
Distribution: na
Organization: Tektronix, Inc., Beaverton, OR.
Lines: 21

> ...  This rate is some form of divided down
> crystal clock. It turns out that Imagen couldn't buy (I don't think
> they make) a crystal that would divide down to give an exact 300 dpi
> in the scan rate. 

This may be more relevant to sci.electronics, but over the frequency range
that oscillator crystals can be cut, you can purchase small lots (or large)
of crystals at any frequency you like.  I once had a couple made for a test
fixture;  the pair cost less than $50, setup, special handling, and all.
They just dial a different number into the crystal manufacturing machinery.
I was amazed.  That was 10 years ago, though;  You may have to learn a
Asian language to order special crystals these days.

Of course, if you want crystals REALLY REALLY cheap, you buy frequencies
like the color TV subcarrier frequency, or some other high-usage frequency;
you probably wouldn't save the cost of a non-binary clock divider circuit.

(Uh - what did that have to do with Postscript? Oh well...)
-- 
Keith Lofstrom   ...!tektronix!vice!keithl   keithl@vice.TEK.COM
MS 59-316, Tektronix, PO 500, Beaverton OR 97077  (503)-627-4052