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From: Helge Blischke <h.blischke@acm.org>
Newsgroups: comp.lang.postscript
Subject: Re: Writing a Ghostscript uniprint driver
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Date: Thu, 31 Jul 2014 12:45:48 +0200
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Stewart C. Russell wrote:

>  
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> zte
>  `9Hn7f@0|PTu%k?pcc9JO"yb40)KJIkkYU6L.T`,8~|\i%
> User-Agent: Pan/0.139 (Sexual Chocolate; GIT bf56508
>  git://git.gnome.org/pan2)
> MIME-Version: 1.0
> Content-Type: text/plain; charset=UTF-8
> Content-Transfer-Encoding: 8bit
> 
> Hi,
> 
> I've recently started experimenting with small roll-fed thermal printers,
> a bit like this one: <https://www.sparkfun.com/products/10438>. They all
> understand variants of Epson ESC-POS, which in turn is very similar to
> the ESC-P and ESC-P/2 command sets of Epson's older impact printers.
> 
> Ghostscript's uniprint driver - http://ghostscript.com/doc/7.07/
> Devices.htm#Uniprint - looks perfect for supporting these little devices.
> Unfortunately, there's precious little documentation on this elderly
> "community supported" driver. Particularly:
> 
> * There's little explanation of the upOutputFormat option
> * most of the parameters for terms like margins and print density are
> only hinted at, and never explained. Unsetting them, or removing them
> causes the output to fail.
> 
> These thermal printers are incredibly simple: 384 monochrome pixels
> across, 8 pixels/mm, effectively unlimited print length; printed (slowly,
> at 9600 baud) as 24 pixel deep by up to 384 pixel wide band.
> 
> Any suggestions, please, as to where I might find clearer guidelines?
> 
> thanks,
>  Stewart
> 
> (if anyone wishes to print to these from a bitmap, I wrote a little
> Python filter that should work on most of them: https://gist.github.com/
> scruss/95c61c9a1501ada2a6c5 )

Read the item 
13.3 Godzilla's guide to the creation of Unified Printer Parameter (.upp)
files
and the following chapters.

Helge