This package contains the following addition and patches to minix 2.0.0 for
TOSHIBA J-3100 GT.  Try them out on your own risk.

					May 3, 1997
					Osamu Ishibashi, M.D., Ph.D.


1. Hard disk driver
This particular model has an XT-type hard disk that is assigned to AT hard
disk I/O space and thus neither at_wini.c nor xt_wini.c does work.  The new
driver gt_wini.c drives this proprietary hard disk system and works both in
real and protected mode.

2. Hardware expanded memory driver
Revised memory.c now drives hardware expanded memory (usually purchased as EMS
bank memory; don't confuse with extended memory).  The memory can be used as a
RAM disk or a block device like a winchester drive.

3. 286 processor shutdown
Minix 1.7.X and later has a function to switch back to real mode from 286-
protected mode.  The kernel shuts down the processor and does the rest of
recovery works by jumping into ROM BIOS code.  Because of ROM BIOS incompat-
ibility, standard minix method (type 0A shutdown) does not work on this model.
Revised klib88.s examines type 0A and 09 shutdown on initialization and calls
one of the valid routines on demand.

4. Floppy disk driver
Original floppy.c has very short head load time (HLT) constant that makes
some machines unstable.  This value alone was changed.


RUNNING STANDARD MINIX
~~~~~~~~~~~~~~~~~~~~~~
You need to run standard minix i86 2.0.0 first.  It's not a straightforward
work to run and install minix on a memory-starved machine.  If you have an
external floppy drive, prepare a floppy minix system on a PC that is already
running minix (make up a single floppy image by integrating ROOT and USR
floppy).  Run minix on one floppy drive and install by mounting source diskettes
on the other drive.

If you don't have an external floppy drive, you need such a small floppy minix
system (is it "tiny ROOT"?) so that you can load on the RAM disk.  I've never
tried this.

Before installing this package standard minix runs only in real mode.  And
only BIOS winchester driver drives the hard disk.  When you start minix,
evoke boot monitor menu and specify the following kernel parameters.
	processor=86
	hd=bios
To avoid loading the RAM disk, specify the following parameter as well.
	roodev=fd0


INSTALLATION
~~~~~~~~~~~~
1. Following files will be replaced.  Keep your own files elsewhere.
	/usr/include/minix/com.h
	/usr/include/minix/config.h
	/usr/src/kernel/Makefile
	/usr/src/kernel/floppy.c
	/usr/src/kernel/klib88.s
	/usr/src/kernel/memory.c
	/usr/src/kernel/proto.h
	/usr/src/kernel/wini.c

2. Put gt-2.0.0.tar.Z on /usr directory and extract the files.  In addition to
the above, /usr/src/kernel/gt_wini.c will be added.

3. Edit /usr/include/minix/config.h to suit your PC and make kernel as usual.


USING GT WINCHESTER DRIVER
~~~~~~~~~~~~~~~~~~~~~~~~~~
ENABLE_GT_WINI in /usr/include/minix/config.h must be set to one.  If you have
set other ENABLE_XX_WINI symbols to one, set the following kernel parameter.
	hd=gt


USING HARDWARE EXPANDED MEMORY
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
On the boot process, you'll see the message
	"XXX pages of expanded memory were detected."
if the system successfully probed the expanded memory.

1. Expanded memory as a block device is the fifth member of the memory driver.
Make an entry by the following;
	mknod /dev/xpm b 1 4
Kernel parameter "ramsize" reserves the amount used as the RAM disk.  Rest of
the amount is accessible via /dev/xpm.

2. In order to use the expanded memory like an additional disk drive,  you
need to mkfs.  Becase it's RAM, mkfs every time you bring up the system.  I
added the following line to /etc/rc.
	mkfs /dev/xpm 2>/dev/null && mount /dev/xpm /tmp


BUG REPORTS AND SUGGESTIONS
~~~~~~~~~~~~~~~~~~~~~~~~~~~
I never had any trouble using the drivers in this package, although they have
been tested in very limited conditions.  Send bug reports and suggestions to
me at osamu@isibasi.com.