From 64aa7ba834e499d338c8ffd4597dbc425325248e Mon Sep 17 00:00:00 2001
From: Bill Joy <wnj@ucbvax.Berkeley.EDU>
Date: Wed, 16 Jan 1980 00:17:47 -0800
Subject: [PATCH] BSD 3 development Work on file usr/man/man4/hp.4

Synthesized-from: 3bsd
---
 usr/man/man4/hp.4 | 85 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 85 insertions(+)
 create mode 100644 usr/man/man4/hp.4

diff --git a/usr/man/man4/hp.4 b/usr/man/man4/hp.4
new file mode 100644
index 0000000000..04ce16679d
--- /dev/null
+++ b/usr/man/man4/hp.4
@@ -0,0 +1,85 @@
+.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)
-- 
2.20.1