changes

NES game Emulator in Linux.c and asm codes.

   to the back area color addition hack
  Render: Implemented mosaic effect (vertical direction only)
  Render: Major tweaks to the vertical offset change support in mode 2 -
   still not correct but appears better
 0.33 [TRAC]
  SPC: Fixed a very stupid, nasty bug that showed up in 0.26, that
   caused the DIV YA,X opcode to corrupt the stack pointer
  Sound: Fixed a bug that caused the sound driver not to be installed
   if a ROM filename was not specified on the command line
 0.32
  Sound: Fixed some problems that caused sound generation to be used
   when sound was disabled [TRAC]
  SPC: Fixed a bug that caused SPC timers to lose cycles in conditional
   branches [Brad Martin]
  SPC: Now allowing SPC timer targets to be set when timer is enabled
   as it seems to fix other timing problems [Brad Martin]
  Render: Fixed some problems with layers using 16x16 tiles having
   small virtual screens [TRAC]
 0.30
  GUI: Fixed yet another small GUI bug [TRAC]
  Joypad: Tore out the old joypad code [TRAC]
  Allegro: Now linking with Allegro 3.11, should fix some sound card
   incompatibilities [TRAC]
  SPC: Bug fixes in 4 SPC opcodes, and a serious bug in the SPC CTRL
   register fixed, AND a new sound DSP/sound generation core
   (Compatibility noticably improved!) [Brad Martin]
 0.277 [TRAC]
  SPC: Fixed timer 2 to be a 64kHz timer - had mistakenly made it 8kHz
   in the rewrite
  SPC: Fixed some bugs in the sound DSP, that could have potentially
   caused memory overwrite
 0.276 [TRAC]
  APU skipper: fixed a nasty bug that showed up in (and went unnoticed
   since) 0.27, caused severe SNES timing problems
  GUI: Fixed a bug causing the CPU Reset to freeze up when the SPC is
   enabled after it having been disabled during execution
 0.275 [TRAC]
  SPC: Many more optimizations to opcode fetcher
  SPC: Implemented TCALL instruction
 0.27 [TRAC]
  SPC: More optimizations
  SPC: Completely rewrote SPC timers - fixes some SPC problems and sound
   playing too fast or slow
  SPC: Forcing SPC to 'catch up' once per 65816 'scanline' time period,
   may clear up more sound quirks (until sound generation code can be
   rewritten)
  Timing: Vblank timing adjusted slightly
 0.26 [TRAC]
  HDMA: Fixed a bug where the transfer size for the first line of a set
   was corrupted
  HDMA: No longer repeats write to register for continue mode
  IRQ: Put in a better H-IRQ hack, until I do the timing
  Render: Palette is set for highest brightness in the frame (helps
   Chrono Trigger, SF2 series, others), thanks to an anonymous
   contributor for help
  Timing: Hblank timing code simplified
 0.251 [TRAC]
  Render: Fixed the back color add hack (Mario World blue sky, others)
   that got broke somewhere along the way.
  Source: Fixed some problems in the makefile that gave some users
   trouble rebuilding.
 0.25 [TRAC]
  CLI: Implemented a basic commandline interface, providing a means to
   override ROM loader autodetection
  Released to the public!
 0.25b17 [TRAC]
  Timing: Reworked how Hblank is handled
  SPC: Now forced to 'catch up' once a frame, solves the 'lags' and
   improves sound overall
 0.25b16 [TRAC]
  SPC: Source cleanup, general optimization (register allocation needs
   more improvement), a few more fixes
  DMA: Fixed a bug where DASL/DASH was not being reset to 0 after general
   DMA transfer (thanks to ESNES and Trepalium for pointing me to DMA -
   F-Zero is fixed!!!)
  Render: Fixed a stupid, nasty, bug in the new sprite code
 0.25b15 [TRAC]
  GUI: Fixed another bug with changing SPC enable (menu item wasn't changed)
  Render: More changes to sprite render code
  PPU: Slight change to 16x8 multiply
  PPU: Fixed the emulation of the RDNMI register/timing - thanks to
   archeide of SNEmul for pointing me in the right direction!)
  65816: Fixed the write order of some instructions
  SPC: Now treating SLEEP and STOP as invalid opcodes for debugging purposes
   (is there any point in emulating these, similar to the 65816's STP?)
  SPC: Fixed part of the SPC register dump
  SPC: Implemented hidden 64 bytes of RAM at top of SPC address space
 0.25b14 [TRAC]
  Fixed a bug in the GUI with changing SPC/sound enable
  Added a FPS counter - it works, unfortunately you can't always see it...
   must be enabled in the GUI
 0.25b13 [TRAC]
  Reversed plot order back to the way it used to be before 0.16 - another
   speed increase (doh!)
 0.25b12 (unreleased) [TRAC]
  Implemented deinterleaved VRAM storage and a new mode 7 renderer:
   VRAM is now also stored as 32k low bytes and 32k high bytes. This has
   minimal effect overall but may provide a mode 7 speed increase, in
   particular for low-end systems (486)
  Fixed a bug where disabling mode 7 also disabled sprites
  More layering priority fixes in modes 2-6
  Altered the 256x240 mode to get rid of a lot of the excess border
  Reduced the 256x240 mode to 256x239
  Modified the way screen modes are handled with the GUI
  More tweaking with DMA/HDMA emulation
 0.25b11 [TRAC]
  Tweaked with the screen core a bit, removing a lot of redundant code
  Improved the header detection in the ROM loader (thanks to Gridle for the
   suggestion)
  Modified the way frameskipping is handled
 0.25b10 [TRAC]
  Tweaked with the controller code a bit - now DKC and Mario All Stars
   work as expected
 0.25b9 [TRAC]
  Fixed a bug in VRAM read ports - they were suggested by zsKnight as a
   likely cause of gfx corruption, and making a change to match a noticed
   difference in the '9X source, gfx corruption went away in the following
   ROMs, and likely others: ActRaiser, FF2, Super Metroid, Wario's Woods...
  Fixed a stupid bug that showed up in 0.25b8 that stopped FF2 from starting
  Several layering priority fixes
 0.25b8 [TRAC]
  Removed H-IRQ hack as it was causing more problems than it helped
  Implemented partial support for delayed IRQ
  Implemented a hack in WAI which causes the CPU timing to skip ahead to the
   next event
  Some SPC optimizations
  Another doc was wrong: increased SPC RAM back to 64k, sound is back to
   being reasonable (timing is still terrible)
 0.25b7 [TRAC]
  More CPU speed-ups
  Hooked SPC back up with on-demand execution, however sound is not
   considered a 'demand', and SPC is slow and buggy still.
 0.25b6 [TRAC]
  Layering priority fix: BG3 highest priority in mode 1 - BG3 high priority
   tiles now drawn over highest priority sprites, not under (helps Mario
   World map)
 0.25b5 [TRAC]
  Fixed a bug in full VRAM address increment
  Fixed a bug that sometimes caused Reset to freeze emulator
  Fixed mode 7 outside-screen-area clip/char 0 repeat - it appears that
   two docs were wrong on this...
  Native mode XCE no longer forces M/X bits set
  Now always keeping 65c816 flags in a register during opcode execution
  More source reorganization
 0.25b4 [TRAC]
  Fixed a bug in scrolling hardware ports
  Rewrote more opcodes to take better advantage of new opcode fetcher
 0.25b3 [TRAC]
  Implemented alternate 65c816 opcode fetcher (should be considerably
   faster - original one likely to be removed in the future)
  Implemented interleaved HiROM support in ROM loader
 0.25b2 [TRAC]
  Finished hooking in last of new horizontal calc code
  Slight speed-up tweak in 65c816 emulation
  Fixed a nasty bug that showed up in 0.25b1 that caused severe gfx
   corruption in at least one ROM (ActRaiser)
 0.25b1 (doh! date in readme said 4-3, should have said 23-3) [TRAC]
  Rewrote horizontal scrolling calc code to reuse data
  Reworked some of the tile cache invalidate tables/recaching code to
   store information on certain special cases of tiles to limit some
   unnecessary checks
  Implemented OAM decode caching - this increases sprite rendering speed
   noticably - more optimizations possible here...
 0.17b7 [TRAC]
  Fixed data store method of double write registers (BG scroll, M7 matrix)
  More speed up tweaks in memory mapper and screen core
  Fixed a bug in HDMA code - fixes GPFs after fights in FF5, extra
   sprites in TMNT4 and missing sprites in Killer Instinct
  Disabled DJGPP LFN support (was causing problems in the Load ROM file
   selector in the GUI, because it's still expecting 8.3 filenames)
   Thanks to Lanice for pointing out the crashing! (doh)
  Rewrote a lot more bits of the GUI to use OOP and allow more advanced
   features to be implemented in the future
  Compiling in two new fonts: the font from ZSNES (thanks zsKnight!),
   and a slightly cosmetically modified version of the same
   (only the modified font is available in the GUI at this time)
 0.17b6 [TRAC]
  More internal work on GUI
  Fixed a bug in mode 1 background priorities with BG3 high priority
   enabled - helps intro in FF5
  Oops! Removed some code that shouldn't have been in b5 - was causing
   the ROM loader to create a test file the size of the loaded ROM
  Fixed a bug that caused the color subtraction in back area hack to
   kick in sometimes when it shouldn't
 0.17b5 [TRAC]
  Fixed a bug in the ROM loader that caused it to get in an endless loop
   on ROMs that weren't an even multiple of 32k (excluding header)
  Fixed a bug that prevented HiROM SRAM from working AND allowed it to
   overwrite other memory
  Implemented SRAM mirroring in HiROM
  Reduced SRAM allocated to 64k and SRAM supported in HiROM to 64k
  Changed the value certain areas of RAM were initialized to to closer
   match SNES '9X
  Changed memory mapper so LoROM/HiROM shared more code/data
  ROM loader: replaced the fstream code with stdio code - this seems to
   fix the problem with 32k ROMs not loading correctly
 0.17b4 [TRAC]
  More work on background plotting speed, hw port emulation speed/accuracy
  SPC disabled - stopped working sometime between b2/b3 and needs to be
   rewritten anyway
  More CPU speed
  Fixed many non-emulation related bugs that caused crashes in pure DOS,
   and forced the switch to WDOSX before
  Reverted to standard DJGPP stub now that WDOSX is no longer necessary
  More fixes to LoROM SRAM mapping - SNES '9X source and one problematic
   ROM provided insight into the workings of SRAM mirroring
  Improved emulation of CGDATA/CGDATAREAD:
   now use seperate vars for odd byte reads
  DMA modes 2+ had been disabled for some strange reason (doh!) - fixed
 0.17b3 [TRAC]
  Now using WDOSX, because of having too many problems with the standard
   DJGPP stub
  Moved plenty of code around in gfx engine for potential speed increase
   and code size reduction
  Most data moved around in hw port emulation
  Most hw ports now reset in Reset (used in 'Reset Emulation' and
   'Load ROM' in GUI) - some still remain (especially in SPC)
  More work on ROM loader
  Can now go in GUI without specifying ROM on command line, however trying
   to load a ROM in GUI is still painful!
 0.17b2 [TRAC]
  Simplified hardware ports in memory mapper
  Improved emulation of OPHCT/OPVCT
  Statically allocating SRAM, WRAM, VRAM, SPC address space, OAM now
  Improved emulation of OAMDATA/OAMDATAREAD:
   now use seperate vars for odd byte reads
  Fixed a bug where 8 bytes too few were being allocated for OAM
  SRAM allocation halved (only 128k now)
  LoROM: SRAM supported reduced to 64k, writes prevented if ROM says less
   exists (allows Puzzle Bobble to start)
 0.17b1 [TRAC]
  Implemented speed throttling (thanks to Richard Mitton of the New
   Zealand Story Emulator for help with this!)
  GUI overhaul begun ('3D' appearance added, code is becoming more object
   oriented)
  CFG handler rewrite begun
  Source cleanup/overhaul begun
  LoROM 16+Mbit and HiROM memory maps fixed (thanks to zsKnight for help!)
  Implemented Hblank emulation/CPU timing (thanks to zsKnight and the '9X
   source for help and info!)
  Fixed emulation of SLHV register (thanks to '9X source for info!)
  Fixed SPC memory map to only have 32k of RAM
  Fixed a few CPU opcodes
  Fixed a memory overwrite bug in a few CPU opcodes which caused the
   emulator to deconfigure controller keymaps

 0.16f: Various bug fixes and speed-ups.