BSD 2.11 - man page for lp (bsd section 4)
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lp - line printer
NLP lp_printers # Line Printer
LP_MAXCOL 132 # Maximum number of columns on line printers
#Name Unit# Addr Vector Br Handler(s) # Comments
lp ? 177514 200 4 lpintr # lp-11 line printer
major device number(s):
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
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-
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.
/dev/MAKEDEV script to create special files
/dev/MAKEDEV.local script to localize special files
lpr(1), dtab(5), autoconfig(8)
Although the driver supports multiple printers this has never been tried.
3rd Berkeley Distribution January 28, 1988 LP(4)
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