add directory Minix

Minix/simulator/READ_ME

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+     This directory contains a program that simulates an IBM PC. The simulator
+has been tested on a SPARC, but since it is written 100% in C (no assembly code
+at all), it should port to other architectures fairly easily.  The full
+source code is available in this directory for FTP.
+
+     In addition to interpreting the 8088 instruction set, the program also
+simulates enough of the I/O devices and other features of the IBM PC to
+allow MINIX 1.1 to run on it.    However, the simulator does not contain
+any BIOS code (because BIOS code is copyright).  Later versions of MINIX
+make a small number of BIOS calls during initialization, so this will have
+to be patched up to run more recent versions of MINIX.  To run MS-DOS on
+the simulator will require the acquisition of a BIOS.  Simulation of more
+I/O devices may also be necessary.
+
+     The simulator, manual and all other files in this directory are copyright:
+
+Copyright Prentice-Hall, Inc. 1991
+
+However, permission is hereby granted for individuals and organizations to
+use and duplicate it for educational and research purposes.  For commercial
+use, permission is required from Prentice-Hall in writing.
+
+     The following files are present in this directory:
+
+88.Z		- Executable binary of the simulator
+Manual.Z	- Simulator manual (troff -ms)
+READ_ME		- This file
+disk.0.Z	- /usr diskette
+image.Z		- Boot diskette
+rootfs.Z	- Root file system diskette
+run.Z		- Shell script to run simulator
+sources.shar.Z	- Complete simulator sources in C (shell archive)
+
+All the .Z files are compressed.
+
+     If you cannot bear waiting until you have read the manual in full
+before trying MINIX, copy all the files, uncompress them and just type 'run'.  
+That shell script will start the simulator and execute the file 'image', which
+contains a MINIX 1.1 executable.  It will start up by loading the RAM disk
+from rootfs, and will do some printing.  Eventually it will ask you to
+insert the /usr diskette and hit ENTER.  The /usr diskette should be present
+on the file disk.0, so just hit <return>.  When it asks for the date, just
+enter it and hit <return>.  When the login prompt occurs, login as ast or
+root.
+
+     The simulator is not blindingly fast.  If you want to improve its
+performance, consider editing 88.s by hand to improve the main decode loop.
+Also look at condition code handling.  Furthermore, the simulator cannot
+run the current version of MINIX.  I haven't looked at this, but my guess
+is that either (1) the current version uses some I/O device such as the hard
+disk that is not currently simulated, and/or (2) the current version makes a
+couple of BIOS calls in the beginning that the simulator cannot handle.
+
+     If you are interested in finding out more about MINIX in general, look
+in the file ../demo/announcement.
+
+     My thanks to David Barto who ported the simulator to the SPARC,
+improved the disk I/O, made the keyboard and screen behave much better,
+and installed various other valuable changes.
+
+Andy Tanenbaum (ast@cs.vu.nl)
+
+