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Atari800 4.0.0

Version 4.0.0 (2018/04/21) - release cooked at Atariada.cz

This release brings four years of hard work of fellow Atari800 developers
on improvements and bugfixes of our favorite Atari emulator.

Ports to Atari ST/TT/Falcon, Android, Raspberry Pi and Sega Dreamcast
have been improved (some of them greatly).

CPU, SIO, ANTIC, GTIA, POKEY and PIA emulation has been corrected.

Atari800 now includes Altirra BIOS so it is now possible to run *some*
programs even without installing the original ROM files.

The total number of changes is so huge that major version bump was necessary.

Contrary to usual NEWS entries here follows a very incomplete list. It might
be updated in later releases. In the meantime please read DOC/ChangeLog
and the commit history in git for complete list of changes.

This release contains breaking changes in color handling. Users updating from
an earlier version should reset their color settings, or else the display
might be unreadable. To reset the color settings, do one of these:
* Select one of the presets available in the menu option "Display settings"->
"Color preset"; or
* Run atari800 with the -color-preset command-line option, e.g.:
atari800 -colors-preset standard; or
* Delete the emulator's config file (.atari800.cfg). Caution: you'll lose
all Atari800 settings!

New features:
* Support for loading of CAS images with "fsk" chunks - images of
copy-protected tapes can now be loaded, with SIO patch being disabled.
* Bit3 Full View 80 Column card emulation.
* New cartridge type 68: "Atrax 128 KB cartridge".
Previously existing cartridge type 17: "Atrax 128 KB cartridge" was based
on a misconception - real Atrax cartridges have their address and data
lines intermixed, so type 17 could not be used with actual ROM dumps. So,
type 17 has been renamed to "Decoded Atrax 128 KB cartridge", and new type
68 has been added, whcih now can be used for Atrax ROM chip dumps.
* New cartridge types supported:
- aDawliah 32 KB cartridge
- aDawliah 64 KB cartridge

* new command line switch "-volume" (for 16bit sound output) that can set
the output volume of the Atari 800 emulator with value from 0 to 100.

* The Sound Settings option "Fragment size" has been renamed to less cryptic
"Hardware buffer size".
* Total emulator volume is lower now because the output has been shifted
in order to fix a possible annoying humming sound in silence on some
receivers (TV sets).

* Fixed computation of gamma adjustment - now it is applied to each of the
three RGB channels separately.
* On systems that support synchronized sound: Fixed the emulator crashing
when Dual POKEY was enabled while High Fidelity POKEY was turned off.
* Improve screen update routines in the Dreamcast port. They don't use
DIRTYRECT anymore but are faster than the old routines when the whole
screen is dirty.
Version 3.1.0 (2014/04/12) - release cooked at Atariada.cz

Highlight of this release: Raspberry Pi port by Andrey Dj

Hidden easter egg: on-screen keyboard in SDL by Christian Groessler

All the following work has been done by Tomasz Krasuski:

General new features:
* More accurate emulation of PAL colours (based on analysis of oscillograms
of real PAL GTIA output)

* Improved PAL blending, working on all grayscale pixels and is accurate now
(can be enabled/disabled in "TV effect" display settings)

* common sound layer implemented (SDL, JavaNVM, OSS, DOS) with synchro sound.

* synchronized sound is now supported by both POKEY sound engines.

* turbo mode (F12) is considerably faster

* Added cartridge mapping used by "Turbo Hit"/"Atari Blizzard Hit".
* Added MegaMax 2 MB cartridge mapping.
* Added read-only support for the 4 MB Flash MegaCart mapping.
* Added minimal support for The!Cart.

General Fixes:
* fixed possible unnecessary cartridge bank switching
* fixes and clean up in Java port
* fixed diagnostic cartridge cold start (doesn't send Start+Option)
* fixed two old bugs in DOS sound (pitch being wrong and sound missing)
* fixed keyboard not working for ncurses video and OSS sound