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-
-What is it?
------------
-
-Xdaniver is a fast, colour X11R6 server for the Amiga's custom chip set
-under NetBSD 1.0 and NetBSD-current, supporting all the Amiga's display
-depths from 1 to 4 (upto 16 colours) on ECS machines and 1 to 8 (upto 256
-colours) on AGA machines (though, not all resolutions are available, see
-General Information below).
-
-Xdaniver is designed to be a drop-in replacement for the Xmono server provided
-with the X11R6 binary distribution supplied by Bernd Ernesti available from
-ftp.uni-regensburg.de or one of its mirrors.
-
-Unlike previous colour X servers for the Amiga that emulate a chunky pixel
-screen in fast RAM, use the standard frame buffer drivers provided with the
-X11R6 source code to draw and then use a chunky to planar conversion routine
-to write the results to the screen (all very slow), Xdaniver uses a heavily
-modified mono frame buffer driver to draw directly using the Amiga's planar
-format. The net result is much faster drawing and support for all the Amiga's
-custom display depths but, as usual, the fewer planes used, the faster the
-drawing operations of the X server. Even so, on my A1200 with a 33Mhz 68030,
-I'm getting reasonable performance when using 8 bit planes in Dbl NTSC mode.
-
-Installation
-------------
-
-You will need to have first obtained and installed the X11R6 binary
-distribution available from ftp.uni-regensburg.de in
-/pub/NetBSD-Amiga/contrib/X11 or one of its mirrors.  Xdaniver has been
-compiled to expect font and configuration files sitting under
-/usr/local/X11R6, if your setup is different you will need to provide a
-symbolic link from /usr/local/X11R6 to where your tree resides or supply
-several command line flags to the server.
-
-To get Xdaniver running as the default X server, copy the uncompressed binary
-into /usr/local/X11R6/bin, remove the current X file from that directory
-(which is a symbolic link to Xmono) and replace it with a link to Xdaniver:
-
-	gzip -d < X11R6.Xdaniver.1.01.tar.gz | tar xvf -
-	mv Xdaniver /usr/local/X11R6/bin
-	cd /usr/local/X11R6/bin
-	rm X
-	ln -s Xdaniver X
-
-Note that on some setups, the devices /dev/kbd, /dev/mouse and /dev/view??
-have been created to be accessable only by superuser; Xdaniver needs to open
-these devices. To workaround this problem, log on as superuser and then
-either make Xdaniver setuid root:
-
-	chown root Xdaniver
-	chmod 4755 Xdaniver
-
-or give everyone access the devices:
-
-	chmod 666 /dev/kbd /dev/mouse /dev/view??
-
-the latter option is a possible cause of a security hole if your machine is
-ever used multi-user.
-
-General Information
--------------------
-
-The default resolution of the server is 700x430 and the default depth 4. AGA
-users might what to increase the display depth by editing the startx script
-and providing a -depth <depth> argument to Xdaniver on the xinit line of the
-script. As always, the lower the depth, the faster the drawing and window
-manipulation of the server.
-
-The resolution can be altered similarly by suppling -width <width> and
--height <height> arguments to the server.
-
-The NetBSD kernel selects actual screen modes by picking a mode who's
-natural, non-overscanned size best-fits the requested resolution.
-Unfortunately, for AGA users, the 1.0 kernel only has support for the
-Dbl-NTSC AGA display mode and only this mode has support for depths greater
-than 4. The NetBSD-current (work-in-progress) kernel also has support for
-Dbl-PAL but still no support for the Super72 or other super-hires modes
-(perhaps some kind, kernel-hacker could add support for them ?).
-
-If you have a 2 button mouse (like me) you might want to try and use the 3
-button mouse emulation. On other systems, it is usual for the left and right
-buttons to be provided and emulate the middle button by pressing both
-buttons together, however, the middle button is tends to be used more than
-the right button so I have provided two options:
-
--emulateright (or -3), the two physical mouse buttons act as left and middle
-and pressing them both together emulates the right button.
-
--emulatemiddle (or -2), the two physical mouse buttons act as left and right
-and pressing them both together emulated the middle button.
-
-When using screen depths of less than 6 (4 is the maximum for ECS machines)
-the lack of possible colours on screen at once causes problems for many X
-applications.  Specifying -cc 2 as a command line argument to Xdaniver
-causes the server to switch the default visual type from PsuedoColor to
-StaticColor; to put it simply, the server prefills the colormap with a
-selection of 16 colours (depth 4) and when an application asks for a
-particular colour, its gets allocated one that is closest to one from the
-selection of 16. This removes the 'WARNING: Cannot allocate colormap entry
-for "XXX"' errors but at the expense of applications not being able to get
-the precise colour they wanted. Also, some badly written X applications fail
-altogether when presented with a StaticColor visual.
-
-Bugs/Limitations
-----------------
-
-The limited choice of display resolutions for AGA/ECS machines is a real
-pain - requires a kernel change to fix. Worse still, the kernel specifies
-the maximum overscan resolution on the Dbl-NTSC to be 724x482 but selecting
-anything more than 702x430 on my machine causes the screen either sheer
-diagonally (as if the bytes per row calculation in Xdaniver or the kernel is
-wrong) or completely loose sync (suggesting a custom chip register sync
-calculation bug). As other, non-aga modes aren't affected when selection
-overscan both problems seem to point to a kernel driver bug. Also, depths
-greater than 4 for AGA users are only supported by the kernel in the Dbl-NTSC
-mode (and Dbl-PAL with the current-NetBSD kernel).
-
-I know of one bug so-far (there will be more), The PutImage request of an XY
-format image expects the bitplane order to be the reverse of that specified
-in the X protocol but since virtually all applications use the Z (chunky)
-format, you are unlikely to come across this problem.
-
-The PutImage request of Z format images is a little slow - when I have time
-I'll try and add one of the fast assembly chunky-to-planar routines developed
-for doom style games/demos. Unfortunately, the current crop all require a
-picture size that is a multiple of 32 pixels and so cannot be used out-of-the-
-box.
-
-Some extra performance could easily be squeezed out of the terminal font
-drawing code (used by xterm) - when I have time I'll add the code.
-
-The Amiga's blitter and sprites are totally unused and will remain so
-until/if someone else adds support to the kernel. The blitter would help
-speed up screen scrolling and window manipulation and sprite support could
-be used for the X pointer shape (if small enough) which would speed up all
-drawing operations (no need to remove the software based pointer shape
-first, draw, then replace the pointer shape).
-
-I removed the X image extension (XIE) from the X server as it increased the
-size of the binary by some 400k. I haven't come across any applications that
-need it yet (I haven't been looking!) so if you need the extension for some
-reason send me e-mail and I'll build a server with the extension included.
-
-The 3 button mouse emulation is very simple - to emulate the 3rd button you
-have to press both button precisely at the same moment - I've got quite good
-at it now. When I have some spare time I'll add a timer so you will have a
-few milli-seconds between one button being pressed and the next and it still
-being registered as the emulated button.
-
-AGA users don't forget to provide the -A flag to loadbsd to enable the one
-AGA mode in the 1.0 kernel but only if you have a VGA, multisync or dual-scan
-monitor, of course !
-
-Xdaniver has been tested on:
-
-A1200, 33Mhz 68030, 8Mb RAM and NetBSD 1.0 by myself.
-A4000/40, 12Mb RAM and NetBSD 1.0 by Andreas Holzhammer.
-A3000, 12Mb RAM and NetBSD 1.0 by Charlie Root, Stuart Park and others.
-A3000, 25Mhz 68040, 18Mb RAM and NetBSD-current by Michael K. Sanders.
-A2000, 8Mb RAM and NetBSD (version unknown) by Hubert Feyrer.
-
-Release and Bug Fix History
----------------------------
-
-1.0	- First release
-
-1.01	Bugs fixed:
-	- Narrow (<32 pixels) Z format GetImage requests corrupted the stack
-	  and could cause the server to core dump. (Xpaint caused this problem)
-	- Drawing dots (PolyPoint request) into a clipped window caused a
-	  c pointer to go out of range, causing a core dump (xv showed this
-	  problem).
-
-	New features:
-	- Simple 3 button mouse emulation using a 2 button mouse; specify
-	 -emulate_middle (or -2) or -emulate_right (or -3) on the server's
-	 command line and press both mouse buttons together emulate the 'missing'
-	 button.
-	- Basic beep sound support added by sending bell characters to the
-	  console.
-	- Source code released.
-
-Disclaimer and Copyright Notices
---------------------------------
-
-Multi-depth planar frame buffer code:
-Copyright (c) 1995 by Daniver Limited.
-
-Large portions:
-Copyright (c) 1994 by Eduardo Horvath.
-Copyright (c) 1987-1995 by the Regents of the University of California.
-Copyright (c) 1987 by Sun Microsystems, Inc. Mountain View, CA.
-Copyright (c) 1987-1995 by X Consortium.
-Copyright (c) 1987, 1989 by Digital Equipment Corporation, Maynard, Massachusetts.
-Copyright (c) 1989 Network Computing Devices, Inc., Mountain View, California.
-
-Permission to use, copy, modify, and distribute this software and its
-documentation for any purpose and without fee is hereby granted, provided
-that the above copyright notice appear in all copies.  The Daniver Limited,
-the above companies and individuals makes no representations about the
-suitability of this software for any purpose.  It is provided "as is" without
-express or implied warranty.
-
-Credits
--------
-
-Thanks to Bernd Ernesti for making the operating system server source code
-available for others to use and Eduardo Horvath and Andy Heffernan, who (I
-think) did the original Xmono server port.
-
-Also, many thanks to the first brave users who tested Xdaniver for me on other
-Amiga setups and found a few bugs in the process.
-
-Gary Henderson.
-
-Daytime: garyh@wet.sbi.com
-Home: gary@daniver.demon.co.uk