changes

NES game Emulator in Linux.c and asm codes.

   thanks to Brad Martin for the information
  Sound: Corrected bug in ADSR/GAIN switching; when switching from GAIN
   to ADSR, envelope update time was not set based on current ADSR state
  Sound: Restructed BRR decoding
  Render: Changed the back area color addition hack to actually add to
   color 0 instead of replacing it, helps many games
  Render: Added support for dual window clipping with OR or AND logic
   modes of 8x8-tile backgrounds with no offset change or mosaic
  Sound: Corrected sample loop behavior, erroneously changed it in 0.73,
   fixes Sidmania
  Sound: Added emulation of 4-point pitch-regulated gaussian
   interpolation of sample data
  Sound: Added emulation of SNES echo effect and its corresponding FIR
   filter
 0.735 [TRAC]
  PPU: Fixed some register corruption issues in VRAM write handlers
  PPU: Altered VRAM writes; when VRAM writes are attempted during the
   display period, update addresses but do not save data, fixes Mega
   Man X status screen glitch
  Sound: Modified the envelope update values
  Sound: Altered timing of attack rate 15, thanks to Brad Martin for
   the correction
  Sound: Altered behavior of ADSR envelope decay with the maximum
   sustain level, thanks to Brad Martin for the correction
  Sound: Altered ADSR/GAIN switching; when switching from GAIN to
   ADSR, use the last ADSR state used by the channel since key on,
   fixes Mega Man X music looping bug, thanks to Brad Martin for help
   with this
  Source: Fixed a bug in the makefile where some flags weren't being
   properly passed for building the CPU cores
 0.73 [TRAC]
  Timing: Changed Korea region to South Korea, and its video standard
   default to NTSC, fixes Dragon Ball Z - Super Butoden 3 (K), thanks
   to MKendora for the information!
  Sound: Changed envelope behavior: when voices already on are keyed on,
   reset volume to zero, thanks to Brad Martin for setting me straight
   on this
  Sound: Fixed envelope behavior: no longer allowing envelope mode
   changes for voices that are releasing
 0.725 [TRAC]
  Render: Added support for single window clipping of 8x8-tile
   backgrounds with no offset change or mosaic
  Timing: Fixed the Final Fantasy 6 timing hack
  Render: Fixed a minor bug in offset change screen map address
   calculation
  Render: Corrected address wrapping for wide and tall screen maps
   at the end of VRAM
 0.721 [TRAC]
  Render: Removed some unused masking code for performance
 0.72 [TRAC]
  Memory map: Added a hack for Batman: Revenge of the Joker, an odd
   ROM with LoROM memory map and ROM info block in the 2nd 32k bank
  Memory map: Fixed behavior of command-line options -fi (Force
   interleaved) and -fn (Force non-interleaved) on non-split ROMs when
   -fl or -fh also used
  Memory map: Fixed behavior of command-line options -fl (Force LoROM)
   and -fh (Force HiROM)
  Timing: Added a hack to eliminate the world map flicker on Final
   Fantasy 6 until timing is improved
  Source: Cleaned up some parts of the source and altered makefile to
   help portability
  Sound: Reevaluated and adjusted sample ranges to increase output
   volume
  GUI: Added options for independently stretching the emulation
   display output in the horizontal and vertical directions
  Other: Added blitter support for the stretch options in 16-bit
   screen modes
  Render: Added full mosaic effect to modes 2 and 4, 16x16-tile
   backgrounds with offset change
  Sound: Re-enabled pitch-modulation
  Sound: Changed the BRR sample decoding to a new method based on
   information from Brad Martin, helps sounds in several games
   (Final Fantasy 6, Chrono Trigger, Mega Man 7, Mega Man X, others)
  Render: Improved performance of background rendering in modes 5 and 6
  Configuration: Reordered screen modes due to new stretch options
 0.706 [TRAC]
  65c816: Added support for the inability to acknowledge an IRQ in the
   instruction immediately after one that clears the I flag, fixes
   Marko's Magic Football, thanks to anomie for information on the
   problem
 0.705 [TRAC]
  65c816: Optimized portions of the main execution loop
  SPC700: Optimized portions of the main execution loop, cycle
   conversions, and timer calculations
  Memory map: Removed the hack for Mega Man X/Rock Man X, it was
   mistakenly commented out some time ago, but is no longer needed
  Memory map: Added support for ROM mirroring, fixes
   Mega Man X/Rock Man X
  SRAM: Corrected addressing in 512kbit and 1Mbit SRAMs, fixes
   Dezaemon and Thoroughbred Breeder 3
 0.702 [TRAC]
  Other: Added code to use the FPU or MMX to clear the framebuffer,
   and to allow disabling of cache preloading
  Config: Added options control usage of FPU/MMX and cache preloading
  Source: Fixed a few minor issues which prevented compilation with
   NASM 0.98.34
  SRAM: Added support for SRAMs larger than 512kbit - unfortunately,
   something must be off as nothing requiring it seems to work yet
  SRAM: Fixed a serious bug in support for HiROM SRAM larger than 64kbit
  Render: Fixed a bug which caused 8x8-tile offset change layers without
   mosaic to not display correctly in mode 4
  Render: Fixed a bug where tile priority was unlikely to behave
   properly in 8x8-tile offset change layers with mosaic
 0.701 [TRAC]
  Sound: Fixed some issues in GAIN register emulation
  Sound: Fixed some issues related to envelope updates
  65c816: Fixed a bug in 16-bit ADC/SBC where invalid values could
   sometimes be stored in the accumulator, fixes a crash in Terranigma
 0.70 [TRAC]
  Sound: Fixed a serious bug in ENVX reading, fixes samples being cut
   short in Super Offroad: The Baja
  Sound: Fixed a serious bug in mixing epilog, fixes freezes in
   Terranigma
 0.694 [TRAC]
  Render: Fixed a bug which caused char 0 repeat outside the screen
   area to not work
  Render: Added full mosaic effect to modes 2 and 4, 8x8-tile backgrounds
   with offset change
 0.692 [TRAC]
  Render: Fixed a bug in modes 5-6 where screen map selection was
   sometimes incorrect when 64-tile screen width was used (fixes
   Seiken Densetsu 3 menu screens)
  Timing: Fixed a bug where IRQs could be set for non-existant H-timer
   positions
  Render: Added full mosaic effect to modes 0-4, 16x16-tile backgrounds
   without offset change
 0.69 [TRAC]
  SPC700: Eliminated some self-modifying code
  Timing: Fixed an IRQ-related bug in register $2137 (SLHV) (thanks to
   SNES'9X)
  Render: Added full mosaic effect to mode 7
  Render: Added full mosaic effect to modes 0-4, 8x8-tile backgrounds
   without offset change
  Timing: Changed timing of RDNMI/HVBJOY vblank start closer to NMI
   like it was before 0.68 - fixes ActRaiser title
  PPU: Eliminated some self-modifying code
  PPU: Fixed a bug in VRAM access (fixes some issues on Earthworm Jim 2
   copyright screen)
 0.68 [TRAC]
  Input: Fixed a bug in the input code
  GUI: Added the ability to configure shift keys for controllers
  Source: Fixed a makefile issue where non-profiling builds were
   linked with profiling enabled - it is safe to delete the
   gmon.out files that were being produced (thanks to stainless
   for reporting)
  Render: Overhauled 8x8 tile background plotters
  65c816: Fixed several address wrapping bugs
  65c816: Optimized 16-bit loads
  SPC700: Fixed a bug in POP PSW where the 'direct page' offset was
   sometimes incorrectly set, fixes Super Punch-Out!!
  SPC700: Various minor bug fixes and optimizations
  SPC700: Optimized 16-bit loads
 0.666 [TRAC]
  Render: Fixed a bug which was causing BG3 high priority tiles to not
   be drawn in mode 1 when BG3 highest priority was disabled
  Render: Restructured the 16x16 tile background plotters
  Render: Added support for offset change in modes 2 and 4,
   16x16-tile layers
  Render: Fixed a bug in the offset-change elimination speed hack
   (was causing it to sometimes disable offset-change despite it
   being used)
  Render: Corrected address wrapping for the vertical offset table in
   mode 2, fixes WWF Wrestlemania Arcade
  PPU: Altered background offset register behavior, fixes Theme Park
   (thanks to anomie and Matthew Kendora)
  Sound: Changed the behavior of the BRR decoding rate for noise-enabled
   channels
  Render: Fixed an OBJ setup bug for large OBJ partially off the left
   edge
  GUI: Fixed a bug where the logo wasn't always displayed
  Logo: Thanks to stainless for providing a new logo!
 0.665 [TRAC]
  Render: Corrected OBJ range limitations (thanks to anomie and Neviksti)
  Render: Removed BG3 highest priority from mode 0 since it doesn't
   actually exist (thanks to anomie)
  Render: Readded mode 7 rendering for the sub-screen
  SPC700/APU skipper: Added APUI00-APUI03 port mirroring
 0.662 [TRAC]
  Render: Corrected mode 7 EXTBG (priority-per-pixel) emulation
   (thanks to anomie and Neviksti)
  PPU: Corrected OAM register emulation (thanks to anomie and Neviksti)
 0.66 [TRAC]
  Sound: Fixed sound DSP key-on behavior
  Sound: Fixed a memory leak when sound was disabled
  Sound: Fixed crashes when switching sample sizes
  Sound: Fixed some issues with 8-bit sound
  Sound: Overhauled portions of the mixing code
  Render: Enabled some portions of the tile cache code which should have
   been already
  Source: Overhauled the makefile
  Source: Reorganized background rendering code
  Render: Added support for offset change in mode 4, 8x8-tile layers
  Render: Added code to eliminate emulation of offset-change when it
   is unused
 0.653 [TRAC]
  Sound: Fixed sound<>SPC timing speed, the conditional-compile directive
   was placed a few lines too late
 0.652 [TRAC]
  Sound: Fixed a sound DSP behavior issue - DSP address bit 7 is
   significant (was ignored since 0.625), fixes Donkey Kong Country
   series, others
 0.651 [TRAC]
  Render: Fixed a few cases where a segment register was not properly
   restored
  Render: Cache-related optimizations in mode 7
 0.65 [TRAC]
  65c816: Optimizations in flag handling and memory access
  SPC700: Optimizations in memory access
  Render: Altered method of decoding 4- and 8-bitplane tiles
  Render: Altered method of clearing framebuffer
 0.641 [TRAC]
  Source: Removed some debugging code that was no longer needed
  Source: Removed errors and warnings when compiling under GCC 3
 0.64 [TRAC]
  Render: Simplified/reoptimized mode 7 rendering
  Render: Corrected depth of low priority sprites in mode 7
  Timing: Fixed a bug which caused some events to occur one instruction
   too late
  Render: Overhauled sprite limitations and priority rotation,
   fixes Final Fantasy: Mystic Quest, perhaps others
  SPC700: Optimizations in flag handling
 0.63 [TRAC]
  Render: Reimplemented priority-per-pixel in mode 7
  Render: Fixed a bug that caused some calculations to be done too
   often in mode 7
 0.625 [TRAC]
  Sound: Removed some debugging code that was breaking Secret of
   Evermore
  Sound: Altered some of the envelope update timings
  Render: Fixed a mode 7 off-by-one-line bug
 0.62 [TRAC]
  Sound: Fixed severe slowdown when sustain was set to infinite
  Sound: Fixed severe slowdown with noise
  65c816: Fixed a crash bug related to WAI instruction
  Render: Fixed a bug where sprites were not recomputed when highest
   priority sprite was changed (fixes star sprite test in test ROM)
  Timing: Changed first non-vblank scanline to 0
 0.61 [TRAC]
  Frameskip: Fixed two bugs in the speed-throttle code: one when speed
   limiter was disabled (min frameskip > 0), one when fast-forward was
   used
  Render: Added code to eliminate emulation of unneeded priorities
  Render: Reoptimized and overhauled the general structure of mode 2
   offset change emulation
  Render: Fixed a bug in mode 7 outside-screen-area clip mode
  GUI: Fixed the behavior of the FPS counter for FPS > 99
  GUI: Added a 'rendering break' counter - tells how many times the
   delayed renderer is forced to synchronize rendering in the last frame
  GUI: Modified the keyboard handling to solve stability issues caused
   by a problem in the DJGPP/Allegro code - GUI is again enabled by