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BSD 2.11 - man page for lp (bsd section 4)

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LP(4)											    LP(4)

NAME
       lp - line printer

SYNOPSIS
       /sys/conf/SYSTEM:
	    NLP        lp_printers  # Line Printer
	    LP_MAXCOL  132	    # Maximum number of columns on line printers

       /etc/dtab:
	    #Name Unit# Addr   Vector Br Handler(s)	 # Comments
	    lp	  ?	177514 200    4  lpintr 	 # lp-11 line printer

       major device number(s):
	    raw: 5
       minor device encoding:
	    bit 01 specifies 64-character set (instead of 96-character set)
	    bits 06 are reserved
	    bits 0370 specify line printer unit: <lp_unit> * 8

DESCRIPTION
       Lp  provides  the  interface to any of the standard DEC line printers on an LP-11 parallel
       interface.  When it is opened or closed, a suitable number of page  ejects  is  generated.
       Bytes written are printed.

       The  unit  number of the printer is specified by the minor device after removing the low 3
       bits, which act as per-device parameters.  Currently only the lowest of the low three bits
       is  interpreted:  if it is set, the device is treated as having a 64-character set, rather
       than a full 96-character set.  In the resulting half-ASCII mode, lower  case  letters  are
       turned  into  upper case and certain characters are escaped according to the following ta-
       ble:

       {	 (
       }	 )
       `	 '
       |	 !
       ~	 ^

       The driver correctly interprets carriage returns, backspaces, tabs, and form feeds.  Lines
       longer  than  the  maximum  page width are truncated.  The page width is specified via the
       LP_MAXCOL definition, set to 132 in the GENERIC distribution.

FILES
       /dev/lp
       /dev/MAKEDEV	   script to create special files
       /dev/MAKEDEV.local  script to localize special files

SEE ALSO
       lpr(1), dtab(5), autoconfig(8)

DIAGNOSTICS
       None.

BUGS
       Although the driver supports multiple printers this has never been tried.

3rd Berkeley Distribution		 January 28, 1988				    LP(4)
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