sp.4

<B>Digital的Unix操作系统VAX 4.2源码</B>

.TH sp 4 VAX
.SH Name
sp \- Small VAX user supplied device driver interface
.SH Syntax
\fBdevice  sp0 at uba0 csr 0x39000000 vector spintr\fR
.SH Description
The MicroVAX 2000 and MicroVAX 3100 system modules both have
connectors that allow for the installation of a single option
.NXR "sp driver"
.NXR "drivers" "sp"
module.  For example, the DHT32 is an option module (see
.MS sh 4 ).  
The ULTRIX software includes drivers for the DHT32 and other 
supported options.
.PP
The
.PN sp
driver is a set of routines that provides the linkages necessary
to add a user-written device driver to the ULTRIX operating
system.  The 
.PN sp
files listed in the Files Section contain comments about
interfacing a new driver to the ULTRIX operating system kernel.
.SH Restrictions
The
.PN sp
driver is not a guide to writing device drivers.
.PP
This driver can only be used with the MicroVAX 2000, MicroVAX 3100,
VAXstation 2000, and the VAXstation 3100 systems. The usefulness
of the 
.PN sp
driver on the VAXstation 2000 and VAXstation 3100 is further limited
by option hardware mounting constraints on those systems.
.SH Files
.PN /sys/data/sp_data.c
.br
.PN /sys/io/uba/spreg.h
.br
.PN /sys/io/uba/sp.c
.SH See Also
sh(4)