lp.4

<B>Digital的Unix操作系统VAX 4.2源码</B>

.\" SCCSID: @(#)lp.4	8.1	9/11/90
.TH lp 4 VAX
.SH Name
lp \- LP11 line printer interface
.SH Syntax
.B "device lp0 at uba0 csr 0177514 flags 0x???? vector lpintr"
.SH Description
.NXS "lp interface" "LP11 line printer interface"
.NXR "LP11 line printer interface"
The
.PN lp
provides the interface to any of the standard
DIGITAL line printers on an LP11 parallel interface.
When it is opened or closed, a suitable number
of page ejects is generated.
Bytes written are printed.
.PP
The unit number of the printer is specified by the minor device
after removing the low 3 bits, which act as per-device parameters.
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, lowercase letters are turned
into uppercase and certain characters are approximated according to
the following table:
.PP
.RS
.ta 1i
\fBCharacter	Printer Approximation\fR
.PP
.ta .25i, 1.5i
	\f(CW{	\o"-("
.sp .1i
	}	\o"-)"
.sp .1i
	\`	\o"-\'"
.sp .1i
	|	\o"\-!"
.sp .1i
	~	\o"\-^"\fR
.sp .1i
.RE
.PP
The driver correctly interprets
carriage returns, backspaces, tabs, and form feeds.
Lines longer than the maximum page width are truncated.
The default page width is 132 columns.
This can be overridden by specifying, for example, ``flags 0xff'' .
.SH Files
.PN /dev/lp?
.SH See Also
MAKEDEV(8)