BSD 3 development

Work on file usr/man/man4/hp.4

Synthesized-from: 3bsd

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+.TH HP 4 
+.UC
+.SH NAME
+hp \- RH-11/RP04, RP05, RP06, RM03 moving-head disk
+.SH DESCRIPTION
+Files with minor device numbers 0 through 7 refer to various portions
+of drive 0;
+minor devices 8 through 15 refer to drive 1, etc.
+.PP
+The origin and size of the pseudo-disks on each drive are
+as follows:
+.PP
+RP partitions
+.br
+       disk    start   length
+.br
+       0       0       15884
+.br
+       1       15884   33440
+.br
+       2       40964   8360
+.br
+       3       0       0
+.br
+       4       0       0
+.br
+       5       0       0
+.br
+       6       49324   291346
+.br
+       7       0       0
+.PP
+RM partitions
+.br
+       disk    start   length
+.br
+       0       0       15884
+.br
+       1       16000   33440
+.br
+       2       0       0
+.br
+       3       0       0
+.br
+       4       0       0
+.br
+       5       0       0
+.br
+       6       49600   82080
+.br
+       7       0       0
+.PP
+It is unwise for all of these files to be present in one installation,
+since there is overlap in addresses and protection becomes
+a sticky matter.
+Ordinarily devices 0 and 6 (or 0 and 7) will be used.
+.PP
+The
+block
+files
+access the disk via the system's normal
+buffering mechanism
+and may be read and written without regard to
+physical disk records.
+There is also a `raw' interface
+which provides for direct transmission between the disk
+and the user's read or write buffer.
+A single read or write call results in exactly one I/O operation
+and therefore raw I/O is considerably more efficient when
+many words are transmitted.
+The names of the raw files
+conventionally
+begin with
+an extra `r.'
+.PP
+In raw I/O the buffer must begin on a word boundary,
+and counts should be a multiple of 512 bytes
+(a disk block).
+Likewise
+.I seek
+calls should specify a multiple of 512 bytes.
+.SH FILES
+/dev/rp?, /dev/rrp?
+.SH SEE ALSO
+rp(4)