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LPR Emulation

Page width = 80 chars with 10 chars per inch = 8 inches = 20.32 cm
Page height = 66 lines with 6 lines per inch = 11 inches = 27.94 cm 

Also common: 54 lines per page

CPI: 10, 12, 15
LPI: 4, 6, 8, 9, 12

Margin top:	0.33"
Margin bottom:	0.53"
Margin L/R:	0.12"

A4: 210x297mm	(8.26x11.69")
Letter: 8.5x11"	(215.9x279.4mm)

See also:

- http://reportman.sourceforge.net/doc/dotmatrix.html
- https://files.support.epson.com/pdf/lq850_/lq850_u1.pdf