- Fixed memory leak that crept in when SA-1 support was added when loading a
game freeze file.
- Added SPC dumping option based on code from Telekawaru that he sent me ages
ago but I've just found again while looking for something else!
- Merged in most of the Amiga PPC port source code changes into the main
source code tree.
- Keying on a sound channel seems to clear its last-sound-sample-block-just-
played flag. Chaos Engine/Soldiers of Fortune needs this.
- Add multi-thread support to the UNIX ports for sound playing - required in
the Linux port to work around a Sound Blaster Live driver bug and useful if
you have multiple CPUs in your machine to help spread the emulation workload.
- Added BS 24Mbit ROM memory map, for Derby Stallion 96 and Sound Novel-TCool.
No idea if it works. Thanks to Nose0000 for the info and code.
- Corrected unzip code not to loop forever if an encrypted zip file is loaded -
an error is generated instead.
- Changed relative SPC700 cycle length for Mortal Kombat 3 to fix sample
repeat problems - I wish I knew exactly how fast the SPC700 is clocked.
Maybe I should write a test ROM and run it on a real SNES?
- 3dfx speed hack back again, only disabled when Seiken 3 is loaded.
- Some minor SA-1 speed ups added - the SA-1 instruction skipping code will
have to wait until I have more time.
- Corrected a SA-1 reset bug that reset the SA1 RAM bank pointer back to block
zero but didn't clear the RAM bank register. Was causing Kirby 3 to crash.
- Fixed a wave clipping problem with interpolated sound that was causing noise
on sound output when certain sound samples were played.
- Fixed a bug in the sync-sound code that could overrun the sound buffer by a
few bytes causing clicks on the sound output.
- The sound sample repeat bug that has plagued Snes9x ever since is was called
Snes96 finally bit the dust - Snes9x continued to play sample loops
even if the game dynamically updated the sample not to loop. Fixes the
stutter in the Mortal Kombat series and improves the sound from several games
that download sound samples in real-time as they are played.
- Rewrote the code the handled the SPC700's 64 byte shadow RAM area to fix a
possible sample corruption problem with ROMs that stored samples that
cross the 64 byte start area.
- Added code to allow ROMs to change the sample being played the next time the
channel loops or is keyed on - not sure if it fixes anything but seems more
- Added a zero-frequency fix to the stereo sound mixing code that I'd already
added to the mono code some time ago.
- Changed the code to set the end-of-sample flag just before the last block is
played, rather than just after. Seems to help improve the sound on some
- Sound sample start code now doesn't reset the channel's envelope volume level
to zero before starting the sample - helps reduce the clicks being heard when
a channel envelope volume level hadn't reached zero before being keyed on
- Changed initialisation of sample-end-register to 0 rather than 255 - seems
more logical now I've thought about it. Not sure if it helps anything.
- Finally fixed the corrupt copy of Donkey Kong Country not working problem -
Snes9x thought the ROM used the same memory map as Street Fighter Alpha 2.
- Added explode, unshrink and unreduce decompression modes support to the
- Fixed offset per tile bug that crept in after me trying to fix the Starfox
- Made some fixes to the C Super FX emulation code, enough to get most 'FX
games playable on the Mac port.
- Finally worked out how character DMA worked on the SA-1 and implemented a
hacky, slow version, but its enough to get the level up screens displaying
correctly on Mario RPG.
- Incorporated ZSNES' new optimised Super FX asm code - had to track down and
fix a nasty memory overwrite bug in the code first to get it to work.
- Changed sample mixing code to not automatically wrap offsets to
keep inside the sound buffer, external port code is now expected to do that.
Helped me fix a problem in the Windows port that prevented very large sound
buffers from working, which are required for some badly written sound card
- Corrected a bug in the SA-1 C code where incorrect processor emulation
functions where called if the code was compiled with in-lining turned off.
- Fixed crash bug in Super Mario RPG on the level up screen - forgot to mask
the enable bit from the RAM bank register. Thanks to Christian Wolf for
sending me a freeze file which made it easy to find the problem.
- Fixed a lockup bug in the window clipping code, if the ROM ever turned off
the sub-screen completely the clipping code would enter an infinite loop.
Fixes The Cartoon Addams.
- Made the Daffy Duck NMI fix only enable when Daffy Duck is loaded - fix was
causing problems for Breath Of Fire 1 and 2.
- Windows port no longer sets DirectSound to exclusive mode, so its now
possible to hear sound output from Windows apps while Snes9x has focus.
- Fixed the freeze file loading and saving on the Windows port.
- More GUI settings are saved in the registry on the Windows port now.
- Added 3D/FX image scaling/filtering support to the Windows port.
- Added the TV mode from the Mac/Linux ports to the Windows port.
- Incorporated Kreed's new output image routines into the Windows port that
fixes RGB555 display colour problems. Many thanks to Kreed.
- New auto-frame rate timing code on the Windows port, stops the silly speed
up problems when the old code tried to 'catch up' after the emulator had
- Increased the DirectSound secondary buffer length on the Windows port to
hopefully fix all the static/broken sound output problems some people were
- Altered the ZSNES Super FX asm code so the Windows port could use it - all
previous versions of the Windows port were shipped using the C Super FX
emulation code which is a lot slower.
- Implemented interpolated and sync-sound options on the Windows port.
- Added an image stretch option to the Windows port - stretches the SNES image
to fill the whole screen or the Window. Looks really good on my TNT card
since that chips seems to filter the image as it scales it.
- Implemented Windowed mode on the Windows port.
- Added special SPC700 cycle timing for Empire Strikes Back.
- Fixed the missing polygon problem for Super FX games - thanks to zsknight
for the information.
- Implemented SA-1 support required for Mario RPG, Kirby Superstar,
Paradius 3, etc. but since only a good image of Mario RPG exists, I could
only test that game.
- Fixed a graphics clip window bug: inverting the area of a clip area that
only consisted of empty bands should become the full width of the screen;
Mario Kart's rear-view mirror display needs it.
- Fixed mode 7 render code to use correct z-buffer when rendering onto the
sub-screen. Fixes Final Fantasy V title screen.
- Added horizontal offset per tile support in the offset per tile modes 2
and 6, and switchable horizontal/vertical offset in mode 4. Fixes Chrono
Trigger in several places and Mario All Stars title screens.
- Changed SPC700 relative cycle length to 14, needed for Stunt Car Racer.
- Enabled immediate triggering of NMI if NMI enable flag set while scan-line
was on first line of v-blank. Needed to fix a background jitter bug in
Daffy Duck: The Marvin Missions.
- Altered ROM load code to ignore corrupt ROM map type byte in ROM header,
preventing the code erroneously detecting what it thinks are interleaved
ROMs. Fixes EEK! The cat, Formation Soccer, the corrupt copy of Donkey
Kong Country, ...
- Disabled IRQ re-triggering if V-IRQ registers set to the current line. Fixes
- Fixed missing sprites in Andre Agassi Tennis - writing to low byte only of
the sprite write address register seems to also clear the hi-byte.
- Games written by the Japanese software company Human seem to need special
SPC700 sound CPU timing, so the ROM load and reset routines now check the
software author company and adjust the CPU cycle length accordingly.
It gets Clock Tower, Super Fire Pro-wrestling Premium, etc working.
- Added ROM check sum calculation and testing code - Snes9x can now detect
pure, corrupt or hacked ROMs.
- Noticed a fast way to implement the SNES 4096 colour mode, so I implemented
it. Now the colours in ActRaiser 2 look correct.
- Corrected a noise frequency error thanks to information from Takehiro.
- Added a 'start in full screen mode' flag to the Linux port.
- While debugging the new graphics code I thought of a fast way to implement
the SNES direct colour mode, tried it out and now the colours in Actraiser 2
- Blast, forgot about the colour window and fixed colour effects. The separate
sub-screen is back again, but all the other graphics speed ups are there.
- Now I've got a z-buffer I keep finding other ways to optimise the SNES
graphics rendering - no need for a separate sub-screen, no need to clear
the sub-screen to the fixed colour, no need to waste CPU time on translucency
effects on hidden pixels, no need to completely clear the main-screen to the
back drop colour, etc., etc.
- Implemented a software z-buffer and changed the SNES graphics rendering to
use it (required change for future 3D card support). Finally fixes the
sprite-to-sprite priority bug that some games suffer from. Also a big speed
increasing for some games (10 fps+), others are slight losers.
- Added code to skip the rendering of completely transparent graphic tiles
rather than comparing each pixel to see if it is transparent; helps the
frame rate a bit on some games.
- Added a fixed for Tetris & Dr. Mario - the game didn't like a multi-player 5
adaptor plugged in to the real SNES when being played, so turned off the
adaptor emulation for this game.
- Added hack for Final Fantasy II - if sync sound isn't on, make attack rate of
1ms actually 0ms (old v1.16 behaviour). Causes a slight click but its better
than samples being cut short.
- Fixed a clip window area invert bug if the colour window was enabled on
on one window and the other window was being used to clip a background layer.
Fixes the finial (I hope) display problem with Gun Hazard.
- Added code to intersect the clip window areas if both a colour window and
a background layer clip window were enabled at the same time. Required by
- Forgot to mark graphic clip windows as needing recomputing when the master
colour window inside/outside/on/off/main-screen/sub-screen PPU register was
updated. Was causing display problems for Gun Hazard.
- Internal H-DMA execution accelerator pointer variables where not always
being recomputed when started H-DMA part way into a frame. Was causing
display problems for Gun Hazard.
- Made H-DMA continue for one extra scan-line to fix a disappearing monster
problem in Dragon Quest 5. Thanks to Alex Jackson for the bug report.
- Zoop seems to require volume envelope height reading by the sound CPU to
always return 0 when the channel is in gain mode.
- The sound code was ignoring updates to the ADSR volume envelope rates while
one was in progress. Fixed that and now the bird song at the start of
Chrono Trigger sounds correct.
- Had to disable the CPU shutdown code for loops reading the horizontal beam
position, it was causing problems for Star Fox. Still no polygons though.
- Oops, sound DSP noise output was broken - accidentally deleted an important
line while removing debug code ready for the last release.
- Added initial 3Dfx support to the Linux port - basically using the Voodoo
card as a bi-linear filtering, scaling blitter. Actually slightly slower than
TV mode, for non-scrolling images due to poor texture upload speeds to the
card, but the full-screen feature is nice and the speed doesn't drop as more
of the screen changes.
- Implemented a sync-sound mode where sound data gets generated in sync with
SPC700 instructions being executed. Finally the sound Williams Arcade
classics can be heard. Also helps slight sound timing problems in many other
games but doesn't fix Mortal Kombat 2 like I thought it would - its
sound routine programmers must have been on drugs or something!
- Added interpolated sound - gives low frequency sounds much more bass similar
to a real SNES especially with the playback rate ramped up to 44KHz.
- Added on-screen messages as various emulation options are toggled on and off
using the in-game keys.
- Fixed a PPU register read bug with the sprite register write position. Thanks
to Takehiro TOMINAGA for the bug report.
- Altered the auto-frame skip timing code to only wait and re-sync to the end
of frame when frames haven't been skipped. Again thanks to Takehiro.
- Speeded up the colour addition and subtraction code using ideas from
- Linux and UNIX sound code now driven directly from signal timer handler
rather than the timer handler just setting a flag which had to be polled in
the main emulation code. Slightly faster execution.
- Fixed the crash bug in the ZSNES Super FX asm code with Vortex - the game's
polygons still aren't visible though.
- Implemented bent-line increase and exponential decay and sustain volume
envelopes - they should match, or at least be very similar to the real SNES
sound DSP chip now.
- It would seem ROMs can key on sound channels even if the channel hasn't
been keyed-off, Pac-In-Time requires it. Changed code to allow it.
- Quick mod to ZSNES Super FX code to get Winter Gold working - it was already
working with the C Super FX code.
- Added emulation of the extra 1/2 scan-line per frame on PAL and NTSC -
should help improve music speed emulation.
- Worked around the click sound heard when ROMs use 0 volume envelope attack
- Removed the 'check for IRQ already happened' H-IRQ position register setting
code - it was causing problems for Ninja Warriors and was not required by
F1 Grand Prix.
- Fixed a bug in the new sound code - the sustain part of the
attack-decay-sustain-release volume envelope was being skipped if the
sustain level wasn't at 100%. The fix has helped some music notes from
being cut off early in a few games.
- Added fix to Pro Action Reply support (again). Thanks to Paul Shoener III for
the original fix and Gil Pedersen for reminding me to apply it!
- Finally fixed the Tales of Phantasia 'bum note' problem! The ROM set its
sample directory to the upper-most page and I forget to code for the hidden
64 bytes of RAM, that appear when the boot ROM is switched off, when fetching
- Adjusted the relative cycle length between the 65c816 and the SPC700 slightly
to get Terranigma working again.
- Oops, the emulated joypads 3 and 4 via the emulated Multi-player 5 interface
weren't working. Thanks to Steffen Schwenke for the bug report.
- Optimised the echo sound code - by-passed the the FIR filter code if only
a pass-through FIR filter was defined by the ROM.
- Modified V and H-IRQ register changing code to trigger an IRQ immediately if
V-IRQ is enabled and the scan-lines match and either H-IRQ is not enabled or
the electron beam position has already gone past the trigger point. Fixes
the screen flicker in F1 Grand Prix.
- Modified the priority-per-pixel mode 7 code to use BG#1's clipping data if
the top bit of the mode 7 pixel is set. Fixes initial track drive-through
display in F1 Grand Prix.
- Modified the sprite priority levels for the priority-per-pixel mode 7
display. Now the car can be seen in F1 Grand Prix.
- Wrote a sound DSP register recording scheme which 'plays back' the register
changes in sync with the sound generation code. I'm bit disappointed, it
only improves the sound in a very few games... Scrapped the code, it actually
causes more problems than it fixes. Oh, well, another 3 weeks work wasted...
- Fixed a SPC700 wake up problem for Lufia I - made the SPC700 also wake up
when the 65c816 read from one of the four comm ports.
- Included lots of sound code speed ups and sound quality improvements
from Takehiro TOMINAGA - many thanks go to him.
- Fixed a case where the -forcelorom option didn't work - the case was
required for Formation Soccer which claims in its ROM header to use the
same memory map as Super FX ROM, it doesn't.
- Pulled apart a real SNES using a crowbar (great fun), just to look at what
speed the SPC700 is actually clocked at for more accurate relative emulation
- Implemented SPC700 cycle counting in the hope the improved timing would fix
Tales'; no such luck but at least the -ratio option is obsolete now.
- Implemented executing SPC700 instructions during DMA, fixes BSZelda and
Goal lock up at start and music pausing briefly when ROMs do lots of DMA,
usually between game screens.
- Scrapped the i386 asm SPC700 code - it was the cause of the music not
restarting after a battle in Chrono Trigger and FF3 and I didn't realise
because the bug had already occurred in the test freeze-file I had.
Thanks to John Stiles for pointing out that the Mac port didn't have the
missing music problem.
- Fixed RGB subtraction bug on displays with only 5 bits for green, e.g. RGB555
displays. The GREEN_HI_BIT variable was always set to a value for 6 bit
- Added the SA-1 memory map, still a long way to go before any SA-1 game will
- Jumped versions to keep in sync with the DOS port release.
- Improved 8-bit sound generation slightly, but it still sounds very poor
compared to 16-bit sound.
- Implemented the Tales of Phantasia memory map using the information supplied
by zsKnight. Had to also implement a de-interleave routine to work around
a ROM feature and Snes9x CPU instruction fetching implementation detail.
- Added a frames-per-second on-screen display option.
- Fixed the final glitch bug with the Mario Kart track display - the byte code
for the termination of the DSP1 raster command wasn't been recognised.
- Disabled a NMI/DMA hack for Rise of the Robots, was causing problems for
Mario Kart and 'Robots wasn't working correctly anyway.
- Optimised the mode 7 rendering a little.
- Changed tile rendering code to use offsets into screen buffer rather than
direct pointers ready for z-buffer implementation.
- Changed V-blank NMI to occur immediately after a WAI instruction, Toy Story
- Fixed reading of H-DMA line counter register, Top Gear 3000 needed this.
- Ripped off large parts of ZSNES's DSP1 code (with _Demo_'s and zsKnight's
approval). Now Mario Kart works almost 100%.
- Added a check to see if a vertical scanline IRQ register change will cause
a H-IRQ later on the current scanline. Pilot Wings needed this.
- Fixed possible crash bug in clip window code when both windows had two
spans. Could actually cause Chrono Trigger to crash the emulator.
- Fixed a lock-up problem with the C Super FX code, Star Fox and executing
a few 'FX instructions per scan-line (required for Winter Gold).
- Partially fixed the DOS netplay server - the server timer is running too
slowly and it doesn't deal with disconnects correctly yet.
- Corrected the sound echo delay - it was varying with the sound playback
rate chosen by the user - it shouldn't have been.
- Implemented DOS netplay code - DOS server code still not working though.
- Removed all floating point calculations from the sound generation code.
- Fiddled with the pitch modulation code - my guess is the output of a
channel that is used to modulate the frequency of another channel is
automatically muted by the SPC700 chip. Just a guess, but the wind from
FF3 sounds 'better' but far from perfect.
- Optimised the tile palette index calculation.
- Optimised the planar to chunky tile conversion code.
- Fixed X11 port to always scale SNES image if hi-res. only (no interpolation)
support is enabled.
- Added zipped ROM image support using Gilles Vollant unzip code and
some code that Ivar (Lestat) sent me a long time ago.
- 65c816 asm RTI instruction was destroying the program bank in emulation mode,
the C code was already correct. Caused C64E to break.
- Finished NetPlay v1 - allows up to five networked machines to play
multi-player SNES games, one player on each machine.
- Switchable full-screen mode added to Linux X11 port, some code and ideas
nicked from Maciej Babinski's original Snes9x XFree86 DGA Linux port, the
UAE Amiga emulator, plus lots of my own code.
- Bug fixes to C Super FX emulation - now Winter Gold works correctly again.
- More DSP1 work. Mario Kart is now playable! The character projection code
is still broken so the opponents and obstacles aren't always positioned
correctly on screen and you keep bumping into them, but I can still keep
- Started work on NetPlay support.
- Decreased sound card DMA buffer size on DOS port to improve sound generation
and sound CPU synchronisation in some games.
- Included Linux joystick driver patches from Vojtech Pavlik so the port can
use the new v1.x joystick drivers, again written by Vojtech Pavlik. Allows
use of Micro$oft Sidewinder pads, NES and SNES pads, PlayStation pads,
Gamepad Pros, etc.
- Added halve-the-result colour subtraction.
- Extended code to allow support for multiple 16-bit screen formats,
switchable at run-time, rather just supporting one, selectable at compile
- Added XFree86 DGA Linux port - code from Maciej Babinski.
- More fixes to the X11 image format conversion and setup code.
- The asm SetByte routine wasn't wrapping writes to S-RAM correctly, allowing
some ROMs to think they were running on a copier and put up an error
screen. Thanks to Nu of #rom for the report.
- Added 'TV-Mode' support (interpolation and scan-lines) to the DOS and
UNIX ports from code based on John Stiles work.
- Added v-sync option to the DOS port.
- Added fix to Pro Action Reply support, thanks to Paul Shoener III.
- Added ggi support (untested) to Linux port using patches from
Alexander Larsson (email@example.com).
- Added 16 to 24/32 bit image conversion routines to the UNIX X11 code.
- The SPC700 OR1 instruction was broken. Thanks to Pyrgopolinices for the
- DOS port was having trouble splitting and joining path names - caused
problems when specifying the full path name of a ROM when the ROM image
was on another drive.
- If a ROM reset the sound DSP and then turned on echo effects but kept
the same echo delay setting, then the echo effects could not be heard.
Thanks to firstname.lastname@example.org for the bug report and freeze file that made it
easy to find the problem.
- DOS port was always using stereo sound setting, if sound card
supported it, regardless of the user preference.
- Linux port X11 port could crash if window was resized while transparency
effects were enabled.
- The colour subtraction accelerator look-up table was slightly wrong, causing
one bit of red, green blue values to 'spill' into the next field.
- Allowed colour window to cut a hole in the main-screen and show the sub-
screen underneath. The effect is used by Illusion of Gaia.
- Added support for colour subtraction, with the halve-the-result flag
- Included DSP1 code from _Demo_. Now you can see the track in Mario Kart and
the ground in Pilot Wings - still can't play the games though due to other
- Added an NMI hack to work around a code bug in Battle Toads: BATTLEMANIACS,
its only by chance that the game works on a real SNES - And disabled it
again because it causes problems for Chrono Trigger.
- A frame skip of zero was actually still skipping one frame. Thanks to
Marius Fodor for the info.
- And yet more X-OR window bug fixes - now the effects during some of the more
'posh' spells look correct in Chrono Trigger.
- Yet another window area inversion bug - off by one pixel on right-hand edge.
- Forgot to put dummy start and end points for XOR window combination modes -
now Uniracers looks correct and Sailor Moon looks like it does on a real
- Window clip code was using wrong index into a 2-dimensional array when
the whole of the main or sub-screens were clipped.
- The master volume disable code was looking that the wrong variable!
- Fixed crash bug in newer sound code if a ROM tried to start a sample
playing who's data went past the end of SPC700 memory. (Cannon Fodder)
- Fixed DSP1 ROM header detection bug.
- More DSP1 work; still nothing works, although I know the multiply command
is correct because I've compared the results against a real DSP1.
- Oops, the multi-player 5 disable code change broke the multi-player 5 being
the default controller.
- Implemented the colour window on the main screen - now Zelda's oval zoom
window displays correctly and Krusty's Super Fun House clips the left-most
8 pixels as it does on the real SNES.
- TERRANIGMA didn't like me returning a random value when it attempted to
read a channel's the current sample byte.
- Hacked in initial support for mode 7 priority-per-pixel - the priority bit
doesn't actually change the priority of the pixel but the two games that I
know of that use the feature look OK. (Winter Extreme Skiing and the
intro of Tiny Toons Adventures).
- Colour addition/subtraction code now uses RGB565 rather than RGB555
calculations - helps a little with the loss of the bottom bit of SNES
- DSP1 emulation started - nothing works yet.
- Switched to adding back drop colour rather than fixed colour when
sub-screen addition is enabled but there's nothing on the sub-screen.
Uniracers seems to need it. - DISABLED it again. Causes problems for
other ROMs and Uniracers itself on later screens.
- Fixed XOR window logic combination mode and area inversion code, now
Uniracers works correctly.
- Oops, if colour window and half colour addition/subtraction were both
switched on, area outside colour window was still being halved, it shouldn't.
Hacky fix at the moment until I implement the correct fix.
- Fixed several bugs with the mosaic effect and 16x16 tiles and a few
possible background scroll offset bugs and the mosaic effect.
- Optimised the sound sample generation code for cases when the SNES
sample playback frequency was higher than the sound card playback rate.
- Fixed possible click sound when a sample was first started to be played.
- Corrected scanline count for PAL games - should be 312 lines verses 262 for
NTSC. Was causing slow music on PAL games.
- Added error correction code to the SPC700 timer update code - the
SPC700 timers are updated using the emulated h-blank handler which is
called every emulated 63.6 microseconds (15.720KHz) but the SPC700 timers
need to be updated at multiples of 8KHz, hence the error. Was causing
music to be played slightly too fast.
- Switched back to using C SPC700 code - the old SPC700 asm code was lacking
several optimisations that the C version had. It also had multiple
speed hack cycle skipping bugs. Plus I hadn't even finished optimising
all the code from the last time I converted the C compiler output.
- Optimised SPC700 memory access routines a little.
- Disabled code that prevented ROMs updating SPC700 timer values while the
timer was running - it seems like it is allowed, even though docs on the
'net I've seen say its not.
- Fixed SuperScope support.
- Added hi-res. option to my DOS port.
- Fixed 4, 6, and 8 button standard PC joystick support.
- Changed some types the source code was using BYTE -> uint8, WORD -> uint16,
DWORD -> uint32 and BOOL -> bool8, types were clashing Windows typedefs
but sizes didn't always match.
- 8-bit double height and/or width tile rendering was missing every other
group of 4 pixels - screen pointer advance count was wrong.
- Asm SPC700 emulation was ignoring the Shutdown flag - the result is its
not possible to turn off cycle skipping for the SPC700 emulation.
- CPU to ROM address decoding code rewritten - used by Game Genie cheat codes,
orginal code might have been the cause of some Game Genie codes not working.
- Started to remove printf calls and replace them with calls to S9xMessage,
port code can then dicide what to do with message.
- Re-enabled decompressed sample caching, still has a possible click problem
but the sound code is a lot faster with it enabled. Added command line option
to disable it if required.
- Added '7' key support to rotate through available controller options, in
the order multi-player5, mouse on #1, mouse on #2, superscope,
standard controller and then back to multi-player5.
- Hi-res. (512x448) support fixed.
- Mouse support completed - Lemmings 2 and Mario Paint working a treat.
- More colour window fixes.
- Fixed freeze game problem when ZSNES SuperFX code is being used -
ZSNES 'FX state was not being saved and restored.
- ZSNES SuperFX asm emulation code plugged in to Snes9x.
- Looks like if the colour window is not enabled at all and the colour
window selector is defined to only allow colour effects inside the colour
window, then no effects should be visible.
- Offset-per-tile rendering code didn't support width 64 screen size, which
Chrono Trigger used on its title screen.
- Contra 3 seems to prove that defining the clip window area to be 'outside'
a window that covers the whole screen is not an area with no range.
- No it doesn't. It proves that I shouldn't have initialised the right
window edges to 255! Contra 3 enables clipping windows without first
defining their range.
- Debug frame advance feature was being prevented from forcing the next
frame to be rendered by SyncSpeed which was being called after the
debugger returned to the main loop.
- H-DMA code was allowing ROMs to manually start H-DMA during the v-blank
period, ROMs shouldn't be allowed to do this.
- Asm code would not push the correct CPU status onto the emulated stack if
returning from an NMI immediately triggered an IRQ - fixes Mortal Kombat 1
and War of the Gems.
- 'd' dump memory debug command was not preserving the CYCLES count.
- C versions of SNES memory access code had same problem as asm code on the DOS
port except it didn't cause a crash just ROMs failed to work correctly.
- Asm i386 code was using signed compares to check for special case memory
areas - it was causing crash problems on the DOS port which was sometimes
returning valid address values with the top bit set - i.e. they seemed
like negative values!
- Changed event reschedule code to always allow h-blank start events, used to
disable them during v-blank period.
- Added code to HDMA when end of visible lines reached.
- Changed register 4212 code not to always return h-blank when in v-blank.
- Clipping fixed colour addition to background area was off by one pixel on
the right-hand edge.
- HDMA: Finially worked out how the real SNES operates when ROMs manual
start H-DMA during the frame - ROMs must set up the H-DMA line count
and address values before H-DMA is started.
- Fixed the asm code to remove all hard-wired structure offsets - one offset
into the IPPU structure was wrong in the code because the structure had
- Added colour window support and allowed graphic window settings to be
different on the main screen and sub screen, just like a real SNES.
- SuperFX LJMP instruction had bank and address values swapped.
- Fixed possible memory overwrite problem because OBJList array was one
element too short.
- Added AND multi-graphic window combo support.
- ROM image memory allocation allocates an extra 32K of RAM, then moves the
pointer forward by that amount - stops the SuperFX emulation from accessing
unallocated memory, possibly causing a crash.
- SuperFX emulation now stores sign and zero flags in separate variables so
the MERGE instruction can set flags correctly.
- Added 65c816 instruction skipping to i386 asm code when 65c816 waiting in
a simple loop for some 'event' to happen e.g. end of frame NMI.
- Finally fixed the APU instruction skipping problem with the i386 asm
code when the WAI instruction is used - caused slow music on some ROMs.
- Offset-per-tile modes don't seem to support screen size - Mario All Stars
Super Mario 2 requires this on title screen. Doesn't seem to effect
Tetris Attack or Puzzle Bobble.
- Changed SNES select and start keys from shift and control to space and
enter - allows shift-fn key to save game positions without the SNES ROM
also getting a select joypad button press.
- Multiplayer5 support for controllers 3+ was broken for ROMs that used
automatic hardware joypad reading rather than reading joypads serially.
- ResetPPU was not clearing tile caches and marking OBJ as need recomputing.
- Cached OBJ positions and sizes were not being recomputed if ROM changed
global OBJ sizes during frame.
- Fixed brightness multiplication problem on 16-bit code for green.
- SPC700 emulation now uses one variable to store ZERO and NEGATIVE flags.
- SPC700 emulation now only increments PC once at end of instruction.
- New ROM type and interleaved detection code.
- Reading sound DSP register ENDX also clears the value. The docs on the
'net said that only writing to the register cleared its value. Fixes
sound in Zoop.
- Fixed mode 4 colour palette problem on background #2 in tile-based graphics
- Fixed graphics mode 4, offset-per-tile support. Only one set of offset data
that is switchable between horizontal and vertical, unlike modes 2 and 6
which allow separate horizontal and vertical offsets per tile.
- Modified the APU timer code again, if the timer is enabled, a write to the
timer target register is only allowed if a value hasn't been written yet.
Fixed Donkey Kong Country 1 and Earth Worm Jim 1 & 2.
- Attack rate of 0ms changed from 1ms back to 0ms because of a group of ROMs
that change from attack mode to decay mode in real-time. Will change back
when I've added better SPC700 CPU and sound generation sync code.
- Added support for ROMs set a new sound timer value while the timer is
enabled (EWJ 1 & 2).
- Added support for ROMs that read the sound envelope height (MK1, MK2, etc).
- ROMs writing to the H-DMA enable register during visible scan-lines were
restarting H-DMA for that frame causing random screen effect corruption.
- Echo feedback seems to be after the FIR filter, not before as a diagram I've
- Sound pitch modulation added.
- Memory access routines changed to pass a single 24-bit address rather than
the previous separate 8-bit bank and 16-bit address parameters.
- Updates to A-Bus address during a frame must not update H-DMA address.
Fixes Actraiser 2 and Pacman 2.
- Removed sound volume mangling - with echo support enabled it doesn't seem to
- Attack rate of 0ms changed to 1ms to help prevent click sound with sudden
start of a sample playing.
- Sample caching of samples that looped using part of the original sample
created a click on the sound output. Caching disabled for the moment. Would
require 512K of cache RAM to fix sample caching.
- Colour addition/subtraction support added - but still a little buggy in
places and very slow.
- 16-bit colour support added.
- Sustain sound volume was not being set if a sample using ADSR was started
with both the attack rate and decay rate set to zero - resulted in missing
sound samples on with some games.
- Sound echo support added.
- Sound channel mixing code was not completely clearing a channel's sound
buffer when a channel finished playing a sample.
- Sound mixing code rewritten to use one buffer, rather than writing each
channel into a separate buffer then combining them into one buffer.
- Memory access routines rewritten to use an 8K block lookup table rather than
dedicated code for each ROM memory map - it was getting difficult to support
the new types of SNES ROM memory maps becoming apparent.
- Sound sample decoding wasn't decoding sound samples correctly if a
previously cached sample was only partially overwritten by the ROM as
opposed to being completely replaced.
- Sound sample decoding wasn't clipping generated sample values correctly.
- Changed H-DMA to start in the current frame only if enable register is
written to during v-blank, h-blank or while the screen is blanked.
- The SPC700 seems to start executing instructions before the 65c816 -
shorter reset pulse? (NO - forgot the SPC700 executes instructions while DMA
is taking place).
- ROMs that reset the H-IRQ position so another IRQ would be triggered on the
same scan-line where not supported - Super Off-Road: The Baj needs it.
- $4212 bit 7 needs to go high at the end of h-blank at line 224 not at the
start of h-blank - Bubsy needs it.
- Sample decoding routine could write to memory outside sample cache area if
address of block to decode was greater than $0x10000 - 9.
- Walking mario can be seen on map screen of MarioWorld - needed sprite
priority rotation working. ROM sets bit 7 of $2103 then sets rotation in
$2102. Reset rotation at start of v-blank not at end.
- Fixed reading of DMA register values - now Ms Pacman works.
- Saved sprite memory address being restored on the wrong scan-line - caused
corrupt sprites on at least one game (GANBARE GOEMON 2).
- Screen colour palette not being updated if ROM only wrote to low byte of
- Possible memory corruption fixed if a ROM tried to write to an invalid
sprite address via PPU registers.
- X11 port support quick load and save by pressing function keys to load or
shift + function keys to save.
- Added option to disable graphic window effects - T2: The Arcade Game doesn't
seem to like them.
- Mode 7 "outside screen area" register interpretation fixed - now the
Actraiser map screen looks a lot better.
- Old DMA code hack for Battle Toads: Double Dragon removed as it was no
longer required and it was causing problems for Ys III.
- Lowered max volume level of 16-bit sound mixing code to help with sound
clipping problems is lots of SNES sound channels are playing.
- Crash bug fixed in mode 7 graphics windows code
- Fixed a noise channel volume bug - noise waveform was getting clipped.
- Fixed 24bit X Window System server support on the Solaris port.
- Sprites in priority level 1 on mode 7 were being drawn incorrectly behind
- BG 3 priority 1 tiles sometimes not drawn dependent on the $2105 bit 3
- Added graphic window support the tile redraw code.
- Added mosaic support to tile redraw code.
- Tile redraw code was drawing one line too many on screen-splits.
- Tile-based redraw code made more intelligent about when a background should
be displayed or not.
- Added wrap within bank support to large DMAs just to support Rock 'n' Roll
- DMA routines added lots of special cases and removed most calls to GetByte,
using a pointer instead.
- Multiple using PPU registers is now only computed when first byte of result
is actually read.
- Sound enabled by default if compiled without DEBUGGER defined.
- Tile redraw method made the default.
- Fixed CPU_SHUTDOWN so SPC700 continues to execute even if main CPU is
"skipping" cycles waiting for an event to happen.
- More command line options added.
- Default cycles-per-scan-line to execute lowered to 90% from 100%.
- +/- keys now work even if auto-frame rate adjust was enabled.
- SPC700 emulation partially rewritten in assembler.
- Asm 65c816 code change to use same speed up techniques as the C++ code.
- Minor speed tweaks to the sound decoding and mixing code.
- C++ SPC700 emulation changed to use same method as 65c816 emulation for
computing and storing emulated CPU flags.
- Mode 7 code rewritten and several scrolling offset bugs fixed.
- Lo-ROM S-RAM memory map bug fixed - now Uniracers works.
- Multiple speed ups and changes to the tile and line-based redraw code.
- Tile and line redraw code changed to cache converted tiles between frames.
- Variable cycle length timing made compile-tile switchable.
- C++ 65c816 emulation changed to use several opcode jump tables to avoid
a register size comparison test on most emulated instructions.
- C++ 65c816 emulation changed how is computes and stores emulated CPU flags.
- Fixed high frequency sound playback bug - the sample rate calculation was
blowing the range of an unsigned long.
- Fixed V-RAM reading so DKC3, Addams Family, Aladdin and Pacman all work.
- Fixed sound code so ROMs can change from ADSR mode to decrease mode - fixes
lots of ROMs.
- Added dynamic speed regulation.
- TCALL vector calculation change from n to 15 - n.
- Fixed crash bug if ROM writes to sound DSP register numbers greater than
- Fixed DOS memory locked for interrupt code.
- Added long name versions of command line switches.
- Added command line switch for SPC700_SHUTDOWN code and WAI cycle skipping
- All DOS memory is now locked from being swapped.
- Fixed DOS port keyboard polling code - could get confused if a keyboard
interrupt happened while keys were being checked.
- SPC700 ADC instruction never cleared Overflow or Carry flags!
- Changed selection of playback speeds for Solaris port.
- Sample caching code was broken - cached samples were never used.
- Added code speed ups for ROMs that use a lot of DMA to VRAM.
- More cpu code asm speed up.
- Fixed 16x16 size tiles on tile-based redraw code.
- Fixed sound gain-mode increase and decrease volume envelopes.
- Added code to support ROMs that reuse sprites in the same frame.
- Fixed processing of negative volume levels.
- Fixed SPC700 EOR1 instruction.
- Added SPC700 shutdown code to stop executing SPC700 instructions if in
a tight loop waiting for a timer or for the 65C816 to respond.
- DOS playback rate was being forced to 16KHz by Allegro - fixed.
- Fixed bug in SPC700 MOV1 C,bit, address.
- Fixed a off-by-one loop sample pointer bug in MixSamples.
- Added command line flags for cached-tile based drawing and sub-screen
background layers priority swapping.
- NOPE, got encoding of the OR1/EOR1,AND1 range of correct originally -
got duff information from an "SPC700" programmer.
- More SPC700 fixes: got the encoding of the OR1/EOR1,AND1 range of
instructions wrong - I guessed wrong originally.
- Sample looping bug fix on mono sound mixing code.
- Sound pitch value no-longer clipped to 14 bits - apparently FF3 needs this.
- Followed Paradox's suggestion and changed graphics code to place sub-screen
background layers below main-screen background layers. Helps lots of games
that use sub-screen addition/subtraction - now you don't have to toggle
background layers on and off so often just to see hidden text, characters,
or maps, etc. Made it switchable.
Acts as a good intermediate solution until sub-screen addition/subtraction
is actually implemented.
- Modified sound skipper code to return random values when ROM is stuck
waiting for the SPC700 CPU to respond - helps several ROMs that previously
don't work with the currently selection of APU skippers.
- Improved sound mixing code so volume is not attenuated so much, giving
better results on 8bit sound cards.
- Changed the frequency at which the joystick polling routine is called - now
called every-other frame rather than every 3rd frame.
- Recompiled Linux and DOS ports with the Pentium optimising version of gcc -
gives a few percent speed increase.
- Changed V-RAM increment count from 64 to 128 - apparently Final Fantasy 3
needs this as well.
- Fixed sprite priority bug with Mode 7 - apparently Final Fantasy 3 needs
- Fixed a screen clipping problem with the S-VGA mode.
- Fixed bug that had crept in with -m 2 S-VGA mode (Linux version).
- Fixed S-VGA Linux version with sound enabled.
- The SPC700 ADC (X),(Y) instruction was broken - with all these SPC700 fixes
now many more ROMs work with sound enabled.
- The SPC700 Pop PSW instruction was not resetting the direct page location.
- The SPC700 instruction MOV A,[DP+X] was incorrectly doing a MOV A,DP+X.
- Got the SPC700 SETx and CLRx instruction encoding swapped around.
- Fixed #define problem that was stopping DOS snapshot saving from working.
- Fixed the DOS filename handling - old Unix code was screwing up with ROM
filenames that contained backslashes (\) - the ROM would load but S-RAM
loading and saving would fail and the default filename for snapshots
- This time really fixed Allegro library keyboard handling (DOS port); it
was missing key some presses/releases (was stopping Chrono Trigger
Left + Right + A button combo from working).
- Added code to automatically remove headers off S-RAM save files with
512 byte headers.
- 32Mbit ROMs in interleaved format are now automatically detected and
- Added -ss 3 sound skip method support to the asm version - now NBA Live '96
- Added support for multi-part ROM images.
- Made libgz.so statically linked (again) on Linux port - sorry.
- Made writing to $4200 also clear any pending IRQs. This finially allows
Battle Toads: Double Dragon, Spawn and Sieken 3 all the work with the same
IRQ logic (but Sieken 3 still gets stuck in sound download code).
- Fixed a H-DMA wobble bug - some frames could randomly miss a line of
H-DMA causing the F-Zero screen to wobble, and slight text character
corruption on games like DKC3.
- Interleaved format ROM images are now swapped in-place, without the need
for a temp 4Mb buffer (saves lots of disk swapping on a 16Mb Windows 95
- Fixed Allegro library keyboard handling (DOS port); it was missing key
- DOS port had a different MAX_PATH value which moved the location of the
SRAM size variable when using the asm CPU emulation core. This, in turn,
caused the SRAM emulation to fail on the DOS port. Donkey Kong County 2 & 3
were reporting a ROM copier was connected to the SNES and refused to run.
- Fixed assembler version of XCE - it was always leaving the carry flag
clear - caused Killer Instinct and Super Punchout to think a ROM
copier was fitted to the SNES and they all refused to run.
- Fixed assembler versions of MVN/MVP - they weren't setting the data bank
register to the destination bank of the instruction.
- Fixed joystick detection on MS-DOS port - a single 2 or 4 button joystick in
port 1 was being ignored if a second joystick was not present in port 2.
- Fixed an uninitialized variable in graphics code - was causing random
missing scan lines on Mode 7 screens.
- Joysticks now scanned every 3rd frame (joystick scanning is slow in the PC).
- Double-whoops, Metriod 3 had stopped working in v0.6 - fixed it
(memory map bug).
- Made bit 6 of $4211 set if v-counter == v-timer-position.
- Made reading of $4200 read $4212 instead.
- Adjusted DMA timing to always access ROM memory at slow speed - this seems
to fix Battle Toads.
- Added code to automatically clear pending IRQs when the horizontal line
is no longer equal to the horizontal timer line - this fixes Seiken 3, it
now just gets stuck in the sound CPU wait code - oh well.
- Moved NMI back to its original pre-0.65 behaviour, now Puzzle Bobble works.
- More graphics speed ups - the code to render background tiles with their
priority bits set is only called if there are actual priority-bit tiles.
- Changed default frame skip rate from 1 to 2 - its seems most people don't
bother to read the docs, so I thought I'll help them out a bit!
- Speeded up Mode 7 graphics on games like F-Zero that rewrite the matrix
registers on each scan line using H-DMA.
- Reorganised the graphics code and did a slight speed up - graphics code
will be the next thing to rewrite in assembler.
- Rewrote CPU core in assembler for Intel platforms - gives a very noticeable
- Fixed several problems with the APU sound CPU emulation - its now getting
stable enough to try and implement sound.
- Fixed bug that caused 1 byte of S-RAM to be emulated when ROM didn't
expect any - it was enough to stop Street Fighter 2 and others from
working - thanks Lord ESNES.
- The TXS and TCS instructions shouldn't set the Z and N flags.
- Looks like MVP/MVN instructions should ignore accumulator size - change
code to always use all 16 bits and exit with accumulator set to 0xffff.
- Whoops, accidently left some test code in which was causing the V-BLANK
flag, bit 8 in register $4212, to be miss-calculated.
- Fixed palette in mode 0.
- Speeded up graphics drawing a little by skipping groups of 4 pixels that
were all transparent.
- S-VGA and MS-DOS ports now have a VGA mode command line flag.
- Improved the fading code - should be much more smooth now.
- Fixed second joy-pad support and re-mapped keys and joysticks to actually
make a match between what my docs said and a real SNES (SNES docs I'd
seen were wrong!).
- Fixed a bug in Relative Long CPU addressing mode.
- Ported Snes96 to MS-DOS.
- Snapshot loading and saving no longer uses external gzip binary.
- Added support for registers at $21c2 and $21c3.
- Made reading the software latch for the horizontal and vertical counters also
clear any pending IRQ.
- Added sprite priority rotation.
- Rewrote parts of the graphics routines to fix a sprite-to-sprite priority
- NMI flag changed again - now back to being reset by reading $4210 but
actual NMI is delayed.
- Made mode 7 background colour 0 transparent - this fixed several sprite
priority problems a few games where having.
- Finally worked out how sprite "Object Name Select" works and emulated it -
this fixes many (if not all) of the corrupted sprites some games
- Delayed NMI activation for one instruction to give time for loops that
wait for bit 7 of $4210 to go high.
- Special-cased line count of 128 on H-DMA to mean repeat previous data with
a line count of 128 and not just terminate H-DMA on that channel.
- APU sound CPU emulation added - just need to debug the thing.
- Fixed Overflow flag setting in ADC and SBC instructions - it was never
- Rewrote how CPU instructions are fetched and how values are pushed and pulled
from the stack - it gave a very large increase in emulation speed.
- H-DMA was being started one scan-line too late.
- Added CG-RAM reading support.
- Added "Full Graphic" V-RAM reading.
- Speeded up C version of CPU emulation quite a bit - could speed it up a
little more before rewriting in assembler.
- Fixed bugs in 16x16 tile drawing on 2bit and 8bit deep screens.
- Speeded up 16x16 tile background rendering by removing a temp tile buffer
it was using. The speed up also fixed a vertical scroll bug.
- Fixed slight window clipping on 16x16 tile backgrounds.
- Added automatic PAL/NTSC mode switching.
- Fixed background and sprites so only visible if on main-screen or
on sub-screen under correct circumstance.
- Fixed lockup bug in DMA.
- Stopped NMI flag from being reset by reading $4210 - was causing a couple
of games to get stuck.
- Whoops, got horizontal and vertical Mode 7 flip bits around the wrong way!
- Fixed MIT shared memory pixmap support for X11 version (it was always turned
- Fixed minor bug - first sprite in priority group was drawn twice. Didn't
cause any visual bugs, it just slowed down redrawing a little.
- Fixed DMA bug - transfer byte count should be 0 after DMA has finished.
- Fixed a scaling bug if width < height.
- Interleaved ROM image support added.
- 16bit and 24bit X11 server support added - with scaling.
- Added window scaling on X11 version.
- Partial clip windows added - the only window overlap option implemented at
the moment is OR, it seems it good enough for all the ROMs I've tested
- Partial Mosaic effect added (pixels only growing vertically).
- Missing Mode 7 "outside screen area" option added.
- Fixed mode 7 screen wrap "outside screen area" option.
- Used new event processing to finally fix H-IRQ so it triggers at the
correct position on the scan line.
- New event processing added.
- Linux version now statically links libgz.so (sorry).
- Linux S-VGA version changed from using a 320x240 ModeX screen (slow) to a
256x256 chunky screen (faster) - thanks to Phillip Ezolt (email@example.com)
for information on how to do this.
- Mode 7 screen flipping added.
- Included Snes97's CPU emulation code into Snes96. Didn't fix any bugs but
slowed down the emulation some what and I couldn't compile it optimised
because it was so large - so I removed it again.
- Added a few extra features available via the keyboard.
- Fixed a H-DMA transfer mode - bad documentation.
- Fixed H-DMA indirect addressing (it was using the wrong CPU memory bank).
- The Linux slow down bug is my crappy laptop enabling battery saving features !
- Changed graphics code to perform true line-by-line screen updates.
- Fixed sprite drawing bugs.
- Ported Snes97's graphics code to Snes96.
- Fixed memory map for HiROM save RAM area.
- Fixed HiROM memory map - now Killer Instinct and Donkey Kong County work !
- OK the slow down bug is just actually my laptop trying to save battery
power by slowing the CPU clock!
- The Linux slow down bug shows itself on DOS emulators running under DOSEMU
so it must be a kernel problem (or feature).
- Fixed H-DMA (again) to be complete emulation - all I need now is line-by-line
- Fixed DMA to not copy too many bytes if byte count was not a multiple of
the transfer mode quantity (caused corruption on Super Mario World map screen).
- Changed mapping of keyboard to joy-pad buttons and added additional
direction keys for joy-pad one so player one's right hand doesn't have to
obscure player two's keyboard joy-pad buttons.
- Changed joystick button layout to match SNES if using a 6 button joy-pad.
- Changed snapshot format so I can easily use libgz on Linux.
- Added few speed up tweaks that will be lost again when I add line-by-line
- First visible scan-line changed from 8 to 1 to match with new docs.
- New SNES information source found; fixed partial H-DMA emulation to include
indirect addressing support.
- Snapshot files are now compressed.
- Compressed ROM images now supported on Linux.
- Snapshot loading and saving added.
- Joystick support for Linux added. One 2, 4 or 6 button joystick, or two 2
button joysticks supported (PC hardware limitation).
- SVGA full screen support added for Linux. Still has the X11 slow down bug so
can't blame the X11 server any more! Must be a kernel bug or a very odd
- Added emulation of two joy-pads on the PC/Sun keyboard.
- Removed -i command line flag as it is no longer used. -h value range has also
changed: now 1 - 100 (percentage).
- Actuate cycle counting rather than instruction counting now added including
fast and slow ROM timing - should give much better timing information when
line-by-line screen update added.
- Bug fixed old-style joy-pad access used by some ROMs - Mario All Stars still
gives problems if enabled and I don't know why; but at least Super Bomberman
now works !
- Looks like if both horizontal and vertical IRQ are enabled then IRQ should
only be triggered once per frame and not once per scan line - looking at the
IRQ handler of a couple of ROMs seems to confirm this.
- Added initial cycle counting - not accurate enough for some ROMs though.
- Finally worked out how the odd VRAM address increments should work but only
found one ROM, so far, that actually uses it.
- Debugged the odd slow down problem with the Linux port - it seems to be a
bug in the X Window System server - starve the X server of keyboard presses
or mouse clicks or movement and the X server slows down, slowing down the
emulator with it !
- Fixed sprite vertical clipping at top of screen.
- No need to invert the Mode 7 transformation matrix before use - the
ROM coder already had to!
- Fixed Mode 7 scrolling offset when using special effects.
- Added Mode 7 rotation, enlargement and reduction emulation.
- DMA shouldn't zero the byte count value after a DMA has completed.
- Added DMA reading (Addams Family was using it)
- Fixed V-RAM read function - returned data should lag behind the V-RAM
address by one byte/word.
- Added mode 7 graphics only.
- Speeded up the main CPU loop a bit.
- Add more command line options:
-f <frame skip> (default 1)
-i <no instructions between polling X> (default 32768)
-h <number instructions per scan line> (default 45, some games allow a lower
setting resulting in a increased
emulated frame rate)
-t enable CPU tracing
-ss <sound CPU skip wait method> (default 0, more methods to be added)
-H disable H-DMA emulation
-F Force Hi-ROM memory map
- Modified planar to chunky conversion to use look up tables.
- But now Mario All Stars won't start. Made emulation of $4016 optional with
-o command line switch.
- Thanks to Carlos (calb) of ESNES fame, I've added correct $4016 & $4017
joy-pad register processing - now several more ROMs will start once a
button is pressed and can be controlled.
- DMA wasn't updating DMA registers with the final CPU address used after the
DMA had completed (caused sprite and background corruption with some ROMs).
Still suspect another DMA side effect isn't being emulated correctly though.
- Fixed setting of CPU overflow flag in ADC and SBC instructions in decimal
- Fixed MVP/MVN CPU instructions to leave X and Y values correct at end of
loop - several more ROMs now work. Still don't know if MVP/MVN instructions
should ignore the accumulator size flag or not.
- Rewrote background drawing code - gives a large increase in speed.
- Flag to only update X Windows colour palette when necessary was missing a
case - caused some ROMs to start with a black screen.
- Code to only update background tiles when changed wasn't working so I
- CPU WAI instruction needed to trigger on hardware IRQ even when interrupt
enable flag was false.
- DMA was not transferring 65536 bytes when byte count was 0.
- Fixed matrix 16bit x 8bit multiplication (old debug code was causing junk
value to be returned).
- Fixed Makefile so version.h header file change recompiles file that shows
version number in window title.
- Added more reporting of used but unimplemented missing hardware features to
- New ROM loading code from Jerremy included, can now cope with ROM images
with no 512 byte header.
- Speeded up emulated memory access a little bit.
- Added matrix 16bit x 8bit multiplication for Super Off-Road Racer.
- Added initial H-DMA emulation - visual effects using it will not be seen
correctly until screen is updated line-by-line rather than the whole screen
- Fixed horizontal sprite clipping (vertical clipping still has a problem).
- Integrated large sprite bug fixes and new background drawing code from
- Fixed large size per-sprite flag; always stayed true after sprite size was
changed to large.
- Rewrote the planar to chunky pixel conversion routines (still need more
- Made registers $4016 & $4017 always return $ff - lots of ROMs that previously
wouldn't go beyond the title screen thought old-style joy-pads were
connected and were waiting for the user to press a button on them.
- Frame skip rate now set to 1 instead of 5 on my P166 laptop!
- Fixed NMI v-blank flag being incorrect set, caused some ROMs to lock.
- X keyboard autorepeat now switched off when emulator has keyboard focus.
- Added number key options to toggle backgrounds 1 to 4 and objs (sprites) on
- Fixed sprite clipping problems at edge of left hand side of screen.
- Corrected Hi-ROM memory map (I think) (no I didn't)
- Fixed most of the sprite-to-sprite priority problems.
- Added sprite debug command, 'S'.
- Added a debug command to show what missing hardware features a ROM was using.
- Added horizontal and vertical beam position IRQ - horizontal always triggers
at start of line at the moment.
- Fixed SBC instruction to set carry flag the correct way around.
Initial release 0.1
- Ported Windows 95 version of Snes96 to Linux on a PC and Solaris on a
- Corrected work RAM memory map.