bsd man page for lp

LP(4)							     Kernel Interfaces Manual							     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.   Cur-
       rently  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 table:

       {	 (
       }	 )
       `	 '
       |	 !
       ~	 ^

       The  driver  correctly  interprets  carriage returns, backspaces, tabs, and form feeds.	Lines longer than the maximum page width are trun-
       cated.  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)