dmbsp.4

<B>Digital的Unix操作系统VAX 4.2源码</B>

.\" SCCSID: @(#)dmbsp.4	8.1	9/11/90
.\" SCCSID: @(#)dmbsp.4	8.1	9/11/90
.TH dmbsp 4 VAX
.SH Name
dmbsp \- DMB32 serial printer interface
.SH Syntax
.B "device dmb0 at vaxbi? node? flags 0x????"
.br
.ti +0.5i
.B "vector dmbsint dmbaint dmblint"
.SH Description
.NXR "DMB32 serial printer interface"
.NXS "dmb interface" "DMB32 serial printer interface"
.NXS "dmbsp keyword" "DMB32 serial printer interface"
A
DMB32
supports a connection to a line printer
through the line printer port of the
DMB32.
.PP
Bits
8-15
of the 
.I flags 
longword specify the number of columns per line on
the line printer.  If 0 is specified, 132 columns are used.
Bits
16-23
specify the number of lines per page.  If 0 is specified, 66
are used.
.SH Diagnostics
.B "dmb%d: Line Printer Disconnected."
.br 
This message occurs if an open is performed on the printer port when
the DMB32 detects that there is no printer cable connected.
.PP
.B "dmb%d: Printer DMA Error"
.br 
A DMA output transfer to the printer failed.
This can be caused by a memory error or an invalid pte (page table entry).
.SH Files
.PN /dev/lp?
.SH See Also
dmb(4), MAKEDEV(8)