MiniUnix/usr/doc/new/start

Find at most related files.
including files from this version of Unix. 
.TL
SETTING UP MINI-UNIX \- Sixth Edition
.PP
Enclosed are:
.IP 1.
`UNIX Programmer's Manual,' Sixth Edition.
.IP 2.
Documents with the following titles:
.DS
Setting Up MINI-UNIX \- Sixth Edition
The UNIX Time-Sharing System
C Reference Manual
Programming in C \- A Tutorial
UNIX Assembler Reference Manual
A Tutorial Introduction to the UNIX Text Editor
UNIX for Beginners
RATFOR \- A Preprocessor for a Rational Fortran
YACC \- Yet Another Compiler-Compiler
NROFF Users' Manual
The UNIX I/O System
A Manual for the Tmg Compiler-writing Language
On the Security of UNIX
The M6 Macro Processor
A System for Typesetting Mathematics
DC \- An Interactive Desk Calculator
BC \- An Arbitrary Precision Desk-Calculator Language
The Portable C  Library (on UNIX)
MINI-UNIX Summary
Regenerating System Software
.DE
.IP 3.
The MINI-UNIX software on magtape or disk pack.
.PP
If you are set up to do it,
it might be a good idea immediately to make a copy of the disk
or tape to guard against disaster.
The tape contains 12100 512-byte records
followed by a single file mark;
only the first 4000 512-byte blocks on the disk
are significant.
.PP
The system as distributed corresponds to three fairly
full RK packs.
The first contains the binary version of all programs, and the
source for the operating system itself;
the second contains all remaining source programs;
the third contains manuals intended to be
printed using the formatting programs roff or nroff.
The `binary' disk is enough to run the system,
but you will almost certainly want to modify some source
programs.
.SH
Making a Disk From Tape
.PP
If your system
is on magtape,
perform the following bootstrap procedure to obtain
a disk with the binaries.
.IP 1.
Mount magtape on drive 0 at load point.
.IP 2.
Mount formatted disk pack on drive 0.
.IP 3.
Key in and execute at 100000
.RT
.DS
  TU10			  TU16
012700			Use the DEC ROM or other
172526			means to load block 1
010040			(i.e. second block) at 800 BPI
012740			into location 0 and transfer
060003			to 0.
000777
.DE
.IP
The tape should move and the CPU loop.
(The TU10 code is
.I
not
.R
the DEC bulk ROM for tape;
it reads block 0, not block 1.)
.IP 4.
Halt and restart the CPU at 0.
The tape should rewind.
The console should type `='.
.IP 5.
Copy the magtape to disk by the following.
This assumes TU10 and RK05; see 6 below for other
devices.
The machine's printouts are shown in italic
(the `=' signs should be considered italic).
Terminate each line you type by carriage return or line-feed.
.DS
= tmrk
.I
disk offset
.R
0
.I
tape offset
.R
100		(See 6 below)
.I
count
.R
1		(The tape should move)
= tmrk
.I
disk offset
.R
1
.I
tape offset
.R
101		(See 7 below)
.I
count
.R
3999		(The tape moves lots more)
=
.DE
To explain:
the
.I
tmrk
.R
program copies tape to disk with the given offsets and counts.
Its first use copies a bootstrap program
to disk block 0;
the second use copies the file system itself onto the disk.
You may get back to `=' level by starting
at 137000.
.IP 6.
If you have TU16 tape
say `htrk' instead of `tmrk' in the above example.
If you have an RP03 disk, say `tmrp' or `htrp',
and use a 99 instead of 100 tape offset.
If you have an RP04 disk, use `tmhp' or `hthp' instead or
`tmrk', and use a 98 instead of 100 tape offset.
The different offsets load bootstrap programs
appropriate to the disk they will live on.
.IP 7.
This procedure generates the `binary' disk; the `source' disk
may be generated on another RK pack by using a tape offset of 4101 instead of
101.
The `document' disk is at offset 8101 instead of 101.
Unless you have only a single RK drive,
it is probably wise to wait on generating these disks.
Better tools are available using MINI-UNIX itself.
.SH
Booting MINI-UNIX
.PP
Once the MINI-UNIX `binary' disk is obtained, the system is booted
by keying in and executing one of the following programs at 100000.
These programs correspond to the DEC bulk ROMs
for disks, since they read in and execute block 0 at location 0.
.DS
  RK05		  RP03		  RP04
012700		012700		Use the DEC ROM or other
177414		176726		means to load block 0 into
005040		005040		location 0 and transfer
005040		005040		to 0.
010040		005040
012740		010040
000005		012740
105710		000005
002376		105710
005007		002376
			005007
.DE
Now follow the indicated dialog,
where `@' and `#' are prompts:
.DS
@ rkmx		(or `rpmx' or `hpmx')
.I
login:  \fRroot
.I
#
.R
.DE
MINI-UNIX uses 12K words of memory for the system
and 16K words for user programs.
Most of the MINI-UNIX software will run with
12K words of memory,
but some things require much more.
.PP
MINI-UNIX is now running,
and the `UNIX Programmer's manual' applies;
references below of the form X-Y mean the subsection named
X in section Y of the manual.
The `#' is the prompt from the MINI-UNIX Shell,
and indicates you are logged in as the super-user.
The only valid user names are
`root' and `bin'.
The root is the super-user and bin
is the owner of nearly every file in the file system.
.PP
Before MINI-UNIX is turned up completely,
a few configuration dependent exercises must be
performed.
At this point,
it would be wise to read all of the manuals
and to augment this reading with hand to hand
combat.
It might be instructive to examine
the Shell run files
mentioned below.
.SH
Reconfiguration
.PP
The MINI-UNIX system running is configured to
run on an 11/10 with the given disk
and the console teletype (KL)
and using the EIS (extended instruction set) 
software emulation package.
This may not be the correct
configuration for your system.
Print (cat-I)
the file /usr/sys/run.
This file is a set of Shell commands
that will completely recompile the system source,
install it in the correct libraries and build the
three configurations for rk, rp and hp.
.PP
Using the Shell file as a guide,
edit low.s (trap vectors) and conf.c (configuration tables)
to include the
device controllers on your system.
Choose from:
.DS
pc	(PC11)
lp	(LP11)
rf	(RS11)
hs	(RS03/RS04)
tc	(TU56)
rk	(RK03/RK05)
tm	(TU10)
rp	(RP03)
hp	(RP04)
ht	(TU16)
dc	(DC11)
kl	(KL11/DL11-ABC)
dl	(DL11-E)
dp	(DP11)
dn	(DN11)
dh	(DH11)
dhdm	(DM11-BB)
.DE
The console typewriter is automatically included;
don't count it in the kl specification.
In low.s, the appropriate parameters at the beginning
of the file should be set to 1 to include the 
corresponding device drivers.
Also if you have a PDP-11/40 with the extended
instruction set (EIS), set the parameter eis = 1 in low.s.
In conf.c, take out the appropriate comment delimiters
to include a particular device controller in the
.I
cdevsw
.R
or
.I
bdevsw
.R
tables.
Edit in the comment delimiters to exclude
a particular device controller.
Take a careful look at
low.s to make sure that all the devices that you
have are assembled in the correct interrupt vectors.
If your configuration is non-standard, you will
have to modify low.s to fit your configuration.
.PP
There are certain magic numbers and
configuration parameters imbedded in various
device drivers that you may want to change.
The device addresses of each device
are defined in each driver.
In case you have any non-standard device
addresses,
just change the address and recompile.
(The device drivers are in the directory
/usr/sys/dev.)
.PP
The DC11 driver is set to run 14 lines.
This can be changed in dc.c.
.PP
The DH11 driver will only handle a single DH
with a full complement of 16 lines.
If you have less,
you may want to edit dh.c.
.PP
The DN11 driver will handle 3 DN's.
Edit dn.c.
.PP
The DP11 driver can only handle a single DP.
This cannot be easily changed.
.PP
The KL/DL driver is set up to run
a single DL11-A, -B, or -C (the console)
and no DL11-E's.
To change this, edit
kl.c to have NKL11 reflect the total number of
DL11-ABC's and
NDL11 to reflect the number of DL11-E's.
So far as the driver is concerned,
the difference between the devices is
their addresses.
.PP
The line printer driver is set up
to print the 96 character set
on 80 column paper
(LP11-H)
with indenting.
Edit lp.c.
.PP
All of the disk and tape drivers
(rf.c, rk.c, rp.c, tm.c, tc.c,
hs.c, hp.c, ht.c)
are set up to run 8 drives and should not
need to be changed.
The big disk drivers (rp.c and hp.c)
have partition tables in them which you
may want to experiment with.
.PP
After all the corrections
have been made,
use /usr/sys/run as a guide to recompile the
changed drivers, install them in /usr/sys/lib2
and to assemble the trap vectors (low.s)
and the configuration table (conf.c).
After all this,
link edit the objects (ld-I)
using the Shell file
.I
shld.
.R
The final object file (a.out) should be
renamed /mx and booted.
See Boot Procedures-VIII for a discussion
of booting.
(Note: remember, before booting,
always perform
a sync-VIII
to force delayed output to the disk.)
.SH
Special Files
.PP
Next you must put in all of the special files in
the directory /dev using mknod-VIII.
Print the configuration file
conf.c created above.
This is the major
device switch of each device class (block and character).
There is one line for each device configured in your system
and a null line for place holding for those devices
not configured.
The block special devices are put in first
by executing the following generic command
for each disk or tape drive.
(Note that some of these files already exist
in the directory /dev.
Examine each file with ls-I with \-l flag to
see if the file should be removed.)
.DS
	/etc/mknod /dev/NAME b MAJOR MINOR
.DE
The NAME is selected from the following list:
.DS
low.s	NAME	device
rf	rf0	RS fixed head disk
tc	tap0	TU56 DECtape
rk	rk0	RK03 RK05 moving head disk
tm	mt0	TU10 TU16 magtape
rp	rp0	RP moving head disk
hs	hs0	RS03 RS04 fixed head disk
hp	hp0	RP04 moving head disk
.DE
The major device number is selected by counting the
line number (from zero)
of the device's entry in the block configuration table.
Thus the first entry in the table bdevsw would be
major device zero.
.PP
The minor device is the drive number,
unit number or partition as described
under each device in section IV.
The last digit of the name
(all given as 0 in the table above)
should reflect the minor device number.
For tapes where the unit is dial selectable,
a special file may be made for each possible
selection.
.PP
The same goes for the character devices.
Here the names are arbitrary except that
devices meant to be used
for teletype access should be named
/dev/ttyX, where X is any character.
The files tty8 (console), mem, kmem, null are
already correctly configured.
.PP
When all the special files have been created,
care should be taken to change
the access modes (chmod-I)
on these files to appropriate values.
.SH
The Source Disk
.PP
You should now extract the source disk.
This can be done as described above
or the MINI-UNIX command dd-I may be used.
The disk image begins at block 4100 on the tape,
so the command
.DS
dd if=/dev/mt0 of=/dev/rk1 count=4000 skip=4100
.DE
might be used to extract the disk
to RK drive 1.
.PP
This disk should be mounted (mount-VIII) on /usr/source; it contains
directories of source code.
In each directory is a Shell file run that
will recompile all the source in the directory.
These run files should be consulted whenever
you need to recompile.
.SH
Floating Point
.PP
MINI-UNIX only supports the 11/45 FP11-B
floating point unit.
For machines without this hardware,
there is a user subroutine
available that will catch illegal instruction
traps and interpret floating point operations.
(See fptrap-III.)
The system as delivered has this code included
in all commands that have floating point.
This code is never used if the FP hardware
is available and therefore does not
need to be changed.
The penalty is a little bit of disk space and
loading time for the few floating commands.
.PP
The C compiler in /usr/source/c probably
should be changed if floating point is available.
The fpp flag in c0t.s should be set and
C should be recompiled and reloaded and
installed.
This allows floating point C programs to be
compiled without the \-f flag and prevents
the floating point interpreter from getting
into new floating programs.
(See /usr/source/c/run.)
.SH
Time Conversion
.PP
If your machine is not in the Eastern time zone,
you must edit (ed-I) the subroutine
/usr/source/s4/ctime.c to reflect your local time.
The variable `timezone' should be changed
to reflect the time difference between local time and GMT.
For EST, this is 5*60*60; for PST it would be 8*60*60.
This routine also contains the names of the
standard and Daylight Savings time zone;
so `EST' and `EDT' might be changed to `PST' and `PDT'
respectively.
Notice that these two names are in upper case
and escapes may be needed (tty-IV).
Finally, there is a `daylight'
flag;
when it is 1 it causes the
time to shift to Daylight Savings automatically
between the last Sundays in April and October
(or other algorithms in 1974 and 1975).
Normally this will not have to be reset.
After ctime.c has been edited
it should be compiled and installed in
its library.
(See /usr/source/s4/run.)
Then you should
(at your leisure)
recompile and reinstall
all programs performing time conversion.
These include:
(in s1)
date, dump, ls, cron,
(in s2)
mail, pr, restor, who, sa and tp.
.SH
Disk Layout
.PP
If
there are to be more file systems mounted than just the root,
use mkfs-VIII to create the new file system and
put its mounting in the file /etc/rc (see init-VIII and mount-VIII).
(You might look at /etc/rc anyway to
see what has been provided for you.)
.PP
There are two considerations in deciding how to adjust the arrangement
of things on your disks:
the most important is making sure there is adequate space
for what is required;
secondarily, throughput should be maximized.
The RK disk (or its image)
as distributed has 4000 blocks for file storage,
and the remainder of the disk (872 blocks)
is set aside for swap space.
This is sufficient to support up to 13 concurrent
processes.
If more processes are required,
the swap space size in param.h must be increased.
.PP
Many common system programs (C, the editor, the assembler etc.)
create intermediate files in the /tmp directory,
so the file system where this is stored also should be made
large enough to accommodate
most high-water marks.
In an idle state about 900 free blocks
on the file system where /tmp resides
should be sufficient.
All the programs that create files in /tmp try to take
care to delete them, but most are not immune to
events like being hung up upon, and can leave dregs.
The directory should be examined every so often and the old
files deleted.
.PP
Exhaustion of user-file space is certain to occur
now and then;
the only mechanisms for controlling this phenomenon
are occasional use of du-I and threatening
messages of the day and personal letters.
.PP
The efficiency with which MINI-UNIX is able to use the CPU
is largely dictated by the configuration of disk controllers.
For general time-sharing applications,
the best strategy is to try to split user files,
the root directory (including the /tmp directory)
and the swap area among three controllers.
Ideally, one would have user files on an RP,
the root on an RF fixed-head disk, and swap on an RK.
This is best since the RK has a faster transfer
rate than the rather slow RF, and in swapping
the transfer rate rather than access time
is the dominant influence on throughput.
.PP
Once you have decided how to make best use
of your hardware, the question is how to initialize it.
If you have the equipment,
the best way to move a file system
is to dump it (dump-VIII) to magtape,
use mkfs-VIII to create the new file system,
and restore the tape.
If you don't have magtape,
dump accepts an argument telling where to put the dump;
you might use another disk or DECtape.
Sometimes a file system has to be increased in logical size
without copying.
The super-block of the device has a word
giving the highest address which can be allocated.
For relatively small increases, this word can be patched
using the debugger (db-I)
and the free list reconstructed using icheck-VIII.
The size should not be increased very greatly
by this technique, however,
since although the allocatable space will increase
the maximum number of files will not (that is, the i-list
size can't be changed).
Read and understand the description given in file system-VI
before playing around in this way.
.PP
If you have only an RP disk,
see section rp-IV for some suggestions
on how to lay out the information on it.
The file systems distributed on tape, containing the binary, the source,
and the manuals,
are each only 4000 blocks long.
Perhaps the simplest way to integrate the latter two
into a large file system is to extract the
tape into the upper part of the RP,
dump it,
and restore it into an empty, non-overlapping
file system structure.
If you have to merge a file system into another, existing one,
the best bet is to
use ncheck-VIII
to get a list of names, then edit this list
into a sequence of mkdir and cp commands
which will serve as input to the Shell.
(But notice that owner information is
lost.)
.SH
New Users
.PP
Install new users by editing the password file
/etc/passwd (passwd-V).
You'll have to make current directories for the new users
and change their owners to the
newly installed name.
Login as each user to make sure the password
file is correctly edited.
For example:
.DS
ed /etc/passwd
$a
joe::10:1::/usr/joe:
.li
.
w
q
mkdir /usr/joe
chown joe /usr/joe
login joe
ls \-la
login root
.DE
This will make a new login entry for joe.
His default current directory is
/usr/joe
which has been created.
The delivered password file
has the user
.I
hl
.R
in it to be used as a prototype.
.SH
Multiple Users
.PP
If MINI-UNIX is to support simultaneous
access from more than just the console teletype,
the file /etc/ttys (ttys-V) has to be edited.
For some historical reason tty8 is the name of the console typewriter.
To add new typewriters be sure the device is configured
and the special file exists, then set
the first character of the appropriate line of /etc/ttys to 1
(or add a new line).
Note that if the special file is inaccessible when init tries to create a process
for it, the system will thrash trying and retrying to open it.
.SH
File System Health
.PP
Periodically (say every day or so) and always after a crash,
you should check all the file systems for consistency
(icheck, dcheck-VIII).
It is quite important to execute sync (VIII)
before rebooting or taking the machine down.
This is done automatically every 30 seconds by the update
program (VIII) when a multiple-user system is running,
but you should do it anyway to make sure.
.PP
Dumping of the file system should be done regularly,
since once the system is going it is very easy to
become complacent.
Complete and incremental dumps are easily done with
the dump command (VIII) but restoration of individual
files is painful.
Dumping of files by name is best done by
tp (I) but the number of files is limited.
Finally if there are enough drives entire
disks can be copied using cp-I, or preferably with
dd-I using an appropriate
block count.
Note that there is no stand-alone program
with MINI-UNIX that will restore any of these formats.
Unless some action has been taken to
prevent destruction of a running version of
MINI-UNIX, you can find yourself stranded even though
you have backup.
.SH
MINI-UNIX and UNIX Differences
.PP
The source for all MINI-UNIX user programs which
are different from those in standard UNIX is in the directory
/usr/sys/source.
If the system size changes from 12K words or these programs
must be re-compiled for other reasons, the source
in this directory must be used in place of the corresponding
source in the /usr/source/s1 and /usr/source/s2
directories.
In particular, the two programs
.I
ld
.R
and
.I
db
.R
know about the system size in order to reflect
the fact that user programs have been relocated
by the link editor to begin execution at the default
memory location of 060000 for a 12K word system.
Using a "-a" flag with these two programs
will cause them to revert to standard UNIX mode,
using an absolute zero (0) as the origin of the binary program
in question.
.PP
There are a number of differences between the capabilities
of MINI-UNIX and standard UNIX of which the user should be aware.
The concept of "groups" is not supported in
MINI-UNIX;
no profiling is done in MINI-UNIX;
it is not possible to interactively debug another running process
in MINI-UNIX.
User programs are limited to 16K words in size
and the sharing of text is not possible.
Pipes are not implemented in the system;
rather they are implemented as "pseudo-pipes"
in the Shell command.
Thus complex commands such as:
.sp
.ti+5
nm a.out | grep _c | pr -3
.sp
are still possible.
However the commands are executed sequentially,
saving data in intermediate files.
The
.ul
bc
command, in particular, works as in the standard UNIX
system but cannot be used interactively since pipes
are not implemented in the system.
The source for the
.ul
yacc
compiler has been edited to change some table sizes
to make it run in 16K words of memory.
You may want to edit y0.c further to make up a
.ul
yacc
with different table sizes for your particular application.
.bp
.SH
Odds and Ends
.PP
The programs
dump,
icheck, dcheck, ncheck, and df
(source in /usr/source/s1 and /usr/source/s2)
should be changed to
reflect your default mounted file system devices.
Print the first few lines of these
programs and the changes will be obvious.
.PP
If you would like to share any MINI-UNIX compatible
software with others,
please let us know about it.
If you find bugs in the software or the
documentation,
again let us know.
.PP
Lastly,
a UNIX users' group has been formed.
To get on their mailing list,
send your name(s) and address to:
.DS
Prof. Melvin Ferentz
Physics Dept.
Brooklyn College of CUNY
Brooklyn, N.Y. 11210
.DE
.PP
.sp3
.DS
		Heinz Lycklama
.DE