FWIW, I still have and occasionally use a 9-pin dot-matrix printer.  It's a 
Panasonic, and to print graphics (like from a DOS CAD program I used to use all 
the time) I have to tell the program I have an IBM Graphics Printer, not any 
kind of Epson.  You should also at least consider the implications for 
different versions of PCL and PostScript.  There may be other 
manufacturer-specific protocols you may want/need to support as well.

Messing with printer protocols is a MAJOR headache, and this project could 
easily turn into a black hole for your time.  I'm not saying this wouldn't be a 
worthwhile project, just be forewarned that it's not as simple as it may seem 
at first.

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