Copyright (c) 1980 Regents of the University of California.
All rights reserved. The Berkeley software License Agreement
specifies the terms and conditions for redistribution.

@(#)lp.4 4.1 (Berkeley) 05/15/85

C 4 lp - line printer device lp0 at uba0 csr 0177514 vector lpintr Lp provides the interface to any of the standard DEC line printers. 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 table:

.ns

10 { \o"-("

.ns

10 } \o"-)"

.ns

10 \` \o"-\'"

.ns

10 | \o"-!"

.ns

10 ~ \o"-^" ..

The driver correctly interprets carriage returns, backspaces, tabs, and form feeds. Lines longer than 132 characters are truncated (This is a parameter in the driver).

/dev/lp lpr(1) None. Although the driver supports multiple printers this has never been tried. In any case user-level software support for multiple printers is not available.