1LP(4)                      Kernel Interfaces Manual                      LP(4)
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NAME

6       lp - line printer
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SYNOPSIS

9       /sys/conf/SYSTEM:
10            NLP        lp_printers  # Line Printer
11            LP_MAXCOL  132          # Maximum number of columns on line printers
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13       /etc/dtab:
14            #Name Unit# Addr   Vector Br Handler(s)      # Comments
15            lp    ?     177514 200    4  lpintr          # lp-11 line printer
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17       major device number(s):
18            raw: 5
19       minor device encoding:
20            bit 01 specifies 64-character set (instead of 96-character set)
21            bits 06 are reserved
22            bits 0370 specify line printer unit: <lp_unit> * 8
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DESCRIPTION

25       Lp  provides  the interface to any of the standard DEC line printers on
26       an LP-11 parallel interface.  When it is opened or closed,  a  suitable
27       number of page ejects is generated.  Bytes written are printed.
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29       The  unit  number of the printer is specified by the minor device after
30       removing the low 3 bits, which act as per-device parameters.  Currently
31       only the lowest of the low three bits is interpreted: if it is set, the
32       device is treated as having a 64-character  set,  rather  than  a  full
33       96-character set.  In the resulting half-ASCII mode, lower case letters
34       are turned into upper case and certain characters are escaped according
35       to the following table:
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37       {         -(
38       }         -)
39       `         -´
40       |         -!
41       ~         -^
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43       The driver correctly interprets carriage returns, backspaces, tabs, and
44       form feeds.  Lines longer than the maximum page  width  are  truncated.
45       The page width is specified via the LP_MAXCOL definition, set to 132 in
46       the GENERIC distribution.
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FILES

49       /dev/lp
50       /dev/MAKEDEV        script to create special files
51       /dev/MAKEDEV.local  script to localize special files
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SEE ALSO

54       lpr(1), dtab(5), autoconfig(8)
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DIAGNOSTICS

57       None.
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BUGS

60       Although the driver supports multiple  printers  this  has  never  been
61       tried.
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653rd Berkeley Distribution      January 28, 1988                          LP(4)