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A7800DS/readme.txt
wavemotion-dave a8326ba44f V3.3 - Database updated. Super Skateboardin' fixed.
2022-02-04 07:24:25 -05:00

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a7800DS
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a7800DS is an Atari ProSystem 7800 console emulator.
To use this emulator, you must use compatibles rom with a78/bin format.
Strongly recommend you use NTSC roms... PAL ones have more scanlines and will render
more slowly and since the sound core is tied to scanlines, the sound will be wrong.
All the debug on this port to the DS has been done with NTSC roms - seek them out!
Do not ask me about such files, I don't have them. A search with Google will certainly
help you.
Features :
----------
Most things you should expect from an emulator. Speed is excellent on the DSi and
not great on the older DS-LITE. For the DS-LITE you can expect full speed only on a
handful of games: Asteroids, Asteroids Deluxe, Astro Blaster, Joust, Robotron,
Food Fight, Astro Fighter, Centipede, Galaga, Moon Cresta, Pole Position II,
Space Duel, Space Invaders, Ms Pac-Man, Meteor Shower and Time Salvo. Pac-Man
Collection is close to full-speed as well.
Add highscore.rom for 7800 High Score saving. This can be in /roms/bios, /data/bios
or in the same directory as the emulator.
Philosophy :
----------
For this particular emulator, I'm not striving for emulation accuracy - the goal is to
get as many games as close to perfectly playable as possible. Nothing else matters if
the game won't run at near full speed with all the gameplay in-tact. Minor screen
glitches or minor sound issues are secondary to making sure the game will actually run.
If you're looking for a highly accurate emulator for the 7800 ProSystem, this isn't
it - try MAME/MESS. But if you're looking to enjoy some classic 7800 console goodness
on your DS/DSi then you've come to the right place!
Be warned, the emulation of the ProSystem is tricky as there are several CPU-like
elements that need to be emulated (6502, TIA, RIOT, Pokey Chip) and the DS-LITE
just doesn't have the horsepower to do it properly so only the smallest non-Pokey
games will run (Asteroids, Centipede, Joust, Meteor Shower, Moon Cresta, Ms Pac Man).
The DSi will run most games at near full speed or beyond - with much higher emulation
compatibility.
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History :
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V3.3 : 4-Feb-2022 by wavemotion-dave
* Squeezed out another frame of performance.
* Super Skateboardin' graphics fixed.
* DSi eliminates frameskip on 80% of the library.
* Updated 50 entries in the internal database - more new homebrews run.
V3.2 : 1-Feb-2022 by wavemotion-dave
* A 5-8% speedup across the board through a number of small optimizations in core areas.
V3.1 : 31-Jan-2022 by wavemotion-dave
* Now using more VRAM for bank swapping and partial DMA transfer to speed up large games.
* Reverted part of the sound core to improve sound quality.
* File selection cleanups to scroll less fast and be generally easier to see.
V3.0 : 06-Nov-2021 by wavemotion-dave
* Reworked sound output core so it's now zinger-free!
* Refresh of bottom screen - improved font and button debounce.
V2.9 : 03-Nov-2021 by wavemotion-dave
* Fixed loading of large SUPER CART roms.
V2.8 : 02-Nov-2021 by wavemotion-dave
* A bit of speed - enough to eliminate the old DS-LITE version.
* A few new homebrews added to the internal database.
* Optmized sound buffers for (very) slightly better performance.
* highscore.rom can now bin in /roms/bios or /data/bios
* Cleanup code as time permitted.
V2.7 : 02-Apr-2021 by wavemotion-dave
* New support for the latest homebrews: Galaxian final
* Added ability to swap screens using L+R+A
V2.6 : 02-Apr-2021 by wavemotion-dave
* Faster directory/file listing.
* Support for the latest homebrews: Galaxian and Popeye
* Improved scaling and offset handling using L/R + Arrow Keys to match other emulators.
V2.5 : 15-Jan-2021 by wavemotion-dave
* Added .A78 header naming search and as a backup filename search to help
properly identify the game being loaded so that the right settings can be applied.
V2.4 : 8-Jan-2021 by wavemotion-dave
* Improvement in bank switching allowing most games to run 60FPS.
V2.3 : 6-Jan-2021 by wavemotion-dave
* Fixed large cart support so 512kb games run fine.
* Fixed voice in Frenzy/Berzerk.
* Fixed graphical glitches in Alien Brigade.
* Optmized bank switching so more big games run smoothly.
* Added default difficulty switches for the few games that need them.
* Lots of cleanups as time permitted.
V2.2 : 5-Jan-2021 by wavemotion-dave
* More memory tweaks - faster processing of memory for another 5% speedup.
V2.1 : 3-Jan-2021 by wavemotion-dave
* Now using DTCM and VRAM for some key memory areas to speed up the emulator almost 10%
V2.0 : 1-Jan-2021 by wavemotion-dave
* Pokey and TIA sound core reworked to provide sound that is worth listening to.
* Please run on a DSi, DSi-XL/LL or 3DS. You won't be happy with the performance on a DS-LITE/PHAT.
V1.9 : 31-Dec-2020 by wavemotion-dave
* Robotron now works with with Twin-Sticks!
* Minor cleanup and polish to end the year...
V1.8 : 23-Dec-2020 by wavemotion-dave
* Major improvements to CPU core to get about 10% speed boost across the board.
More games playable at full speed on DSi and above. Special DS-LITE build
included that supports only the smallest and most basic games (but at near
full speed).
V1.7a : 21-Dec-2020 by wavemotion-dave
* Full Pokey Support at both 450 and 4000. XM RAM mapping at 4000 so games
like Serpentine will run properly now. Undocumented opcodes for the Sally
processor now implemented so games like Popeye will run fine.
V1.7 : 20-Dec-2020 by wavemotion-dave
* After much thought and debug, I've ditched Kangaroo mode. As near as I can
tell it's used on only a couple of games and not for gameplay - and it costs
more DS-CPU time than it's worth. There is no harm other than a potential
graphical glitch which I've not noticed and that CPU time is precious.
V1.6b : 19-Dec-2020 by wavemotion-dave
* Fixed bug causing black rectangles on some games - thanks to Wii-7800!
V1.6 : 17-Dec-2020 by wavemotion-dave
* Minor cleanup. Rebranding to PHOENIX EDITION.
V1.5 : 15-Dec-2020 by wavemotion-dave
* Overhaul of scaling and X/Y offsets so that more games look pixel perfect.
* More homebrews run... compatibility table added to the back end of this doc.
* More robust handling of High Score Cart and saving of files.
V1.4 : 13-Dec-2020 by wavemotion-dave
* Implemented Hiscore Saving per the HSC cart. Put the 4k highscore.rom (don't ask)
where your ROMs live. If found, it will enable saving of high scores
on all 9 original games (Asteroids, Joust, Centipede, Xevious, Dig Dug, Galaga,
Food Fight, Ms Pac-Man and Robotron) as well as most of the newer homebrews.
V1.3 : 12-Dec-2020 by wavemotion-dave
* Backported some fixes and emulation timing improvments from Prosystem 1.3g
plus the Wii version. Renders a few more games playable.
* Fixed region for Froggie and Beef Drop - they now look right and play
at full speed.
* Minor other improvements as time permitted.
V1.2 : 10-Dec-2020 by wavemotion-dave
* More speed improvements. Fixed some 320 pixel games. Improved sound.
V1.1 : 09-Dec-2020 by wavemotion-dave
* Brought back to life... cleanup and about a 50% speed improvement, better
screen rendering/scaling and slightly improved UI features.
V1.0 : 24/05/2011
* Initial release based on my a320 version (which is based on Prosystem 1.0.3)
* Compiled with last version of Devkitpro/libnds, so DSi compatible \o/
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How tu use a7800DS :
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Place .NDS on your SD card and launch with Twilight Menu++ or Unlaunch.
If you want to run on a flash cart, it might work... recommend HBMENU to launch.
Strongly recommend you run on a DSi or 3DS to get full speed. DS-LITE/PHAT is slow.
When the emulator starts, click on the cartridge slot to choose a file. Use Up/Down
to select a file, then use A to load it.
Controls :
* Direction pad : the joystick ...
* A : Fire button 1
* B : Fire button 2
* SELECT : SELECT Button
* START : PAUSE Button
* X : FPS Display
* Y : Fire Button 1 (for those that prefer not using A)
* L/R + DPAD : Used to Shift Offsets and Scale Screen to desired ratio
Use stylus on buttons for other actions on bottom screen.
High Score Saving works if you have highscore.rom (exact name and case) in your
roms directory where you load your games... also, you MUST press the HSC button
if you want to snap the Saved Scores out to the flash card. It's not something
I want to do as the game runs... so you must do it... the high scores will also
auto-save if you quit the emulator or select a new game.
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Credits:
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Thanks Wintermute for devkitpro and libnds (http://www.devkitpro.org).
Greg Stanton for ProSystem source code (https://home.comcast.net/~gscottstanton/)
an Atari 7800 emulator.
zx81 (http://zx81.zx81.free.fr/serendipity_fr/) for PSP A7800 version (that helped
me a lot to understand ProSystem).
raz0red (http://www.twitchasylum.com/forum/viewtopic.php?t=519) for WII7800 (that
helped me a lot to fix some timing problem).
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Original Author:
Alekmaul
alekmaul@portabledev.com
http://www.portabledev.com
Updates by wavemotion-dave: https://github.com/wavemotion-dave/A7800DS
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Compatibility Table (on the faster DSi)
GAME MD5SUM HSC FPS NOTES
========================================================================================================================
Ace Of Aces 0be996d25144966d5541c9eb4919b289 NO 60 Minor graphical glitches. Very playable.
Alien Brigade 877dcc97a775ed55081864b2dbf5f1e2 NO 56 A bit slow but playable
Arkanoid Demo 212ee2a6e66d8bb7fbf26f343cc8dc19 NO 60 Playable though paddles would be nice.
Asteroids 07342c78619ba6ffcc61c10e907e3b50 YES 60 Near perfect
Asteroids Deluxe a65f79ad4a0bbdecd59d5f7eb3623fd7 YES 60 Near perfect
Astro Blaster 3d38281ed8a8d8c7cd457a18c92c8604 YES 60 Near perfect
Astro Fighter a51e5df28a0fe8c52e9d28fb5f8e44a6 YES 60 Near perfect
Baby Pac Man 7cdfbe37634e7dcd4dc67db7edbcd3ba NO 60 Near perfect
Ballblazer 8fc3a695eaea3984912d98ed4a543376 NO 60 Near perfect
Barnyard Blaster 42682415906c21c6af80e4198403ffda NO 60 Needs Lightgun Support (not implemented)
Basketbrawl f5f6b69c5eb4b55fc163158d1a6b423e NO 60 Minor glitches. Mostly playable.
Beef Drop (Final) 78b1061d651ef806becac1dd3fda29a0 YES 60 Near perfect.
BonQ (Final) 9fa7743a016c9b7015ee1d386326f88e YES 60 Graphical glitches on title screen. Play is near perfect.
Centipede 5a09946e57dbe30408a8f253a28d07db YES 60 Near perfect
Choplifter 93e4387864b014c155d7c17877990d1e NO 60 Near perfect
Commando 2e8e28f6ad8b9b9267d518d880c73ebb NO 60 Near perfect
Crack'ed db691469128d9a4217ec7e315930b646 NO 60 Would be better with lightgun support.
Crossbow a94e4560b6ad053a1c24e096f1262ebf NO 60 Would be better with lightgun support.
Dark Chambers 179b76ff729d4849b8f66a502398acae NO 60 Near perfect
Desert Falcon 95ac811c7d27af0032ba090f28c107bd NO 60 Near perfect
Dig Dug 731879ea82fc0ca245e39e036fe293e6 YES 60 Near perfect
Donkey Kong 19f1ee292a23636bd57d408b62de79c7 NO 60 Near perfect
Donkey Kong Jr 5e332fbfc1e0fc74223d2e73271ce650 NO 60 Near perfect
Donkey Kong XM Demo c3107d3e3e17d67e3a11d47a5946a4f3 NO 60 Near perfect
Double Dragon 543484c00ba233736bcaba2da20eeea9 NO 60 Glitchy top graphics... but playable.
Dragon's Descent 94009ccfdcd4f55d24033ca06269ba6a NO 60 Near perfect
Drakers Quest I fab1290f9a4c4f2b4d831c8a57f969f5 NO 60 Near perfect
Drakers Quest II a9f29004412621f20ad9f5c51cc11486 NO 60 Near perfect
Dungeon Stalker b3143adbbb7d7d189e918e5b29d55a72 YES 60 Near perfect
E.X.O Alpha 12 faea27017447dd8bae677d91125a8135 YES 60 Near perfect
F-18 Hornet 2251a6a0f3aec84cc0aff66fc9fa91e8 NO 60 A few small graphical glitches but playable.
Failsafe (homebrew) 6287727ab36391a62f728bbdee88675c YES 60 Near perfect
Fatal Run d25d5d19188e9f149977c49eb0367cd1 NO 60 Near perfect
Food Fight cf76b00244105b8e03cdc37677ec1073 YES 60 Near perfect
Frenzy (with Berzerk) e7d89669a7f92ec2cc99d9663a28671c YES 60 Near perfect (voice slightly wrong pitch)
Froggie 6053233cb59c0b4ca633623fd76c4576 YES 60 Near perfect
Galaga fb8d803b328b2e442548f7799cfa9a4a YES 60 Near perfect
Hat Trick fd9e78e201b6baafddfd3e1fbfe6ba31 NO 60 Near perfect
Ikari Warriors c3672482ca93f70eafd9134b936c3feb NO 60 Near perfect
Impossible Mission baebc9246c087e893dfa489632157180 NO 60 Near perfect
Jinks 045fd12050b7f2b842d5970f2414e912 NO 60 Near perfect
Joust f18b3b897a25ab3885b43b4bd141b396 YES 60 Near perfect
Jr. Pac-Man e54edc299e72d22d0ba05d16f3393e8c YES 60 Near perfect
Klax 17b3b764d33eae9b5260f01df7bb9d2f NO 60 Near perfect
Karateka c3a5a8692a423d43d9d28dd5b7d109d9 NO 60 Minor glitches. What's the point of this game?!
Kung Fu Master f57d0af323d4e173fb49ed447f0563d7 NO 60 Near perfect
Mario Bros. 431ca060201ee1f9eb49d44962874049 NO 60 Near perfect
Meteor Shower c3f6201d6a9388e860328c963a3301cc YES 60 Near perfect - my favorite homebrew!
Midnight Mutants bc1e905db1008493a9632aa83ab4682b NO 60 Near perfect
Moon Cresta 9ff38ea62004201d870caa8bd9463525 YES 60 Near perfect
Ms. Pac-Man fc0ea52a9fac557251b65ee680d951e5 YES 60 Near perfect
Ninja Golf 220121f771fc4b98cef97dc040e8d378 NO 60 Near perfect
One On One 74569571a208f8b0b1ccfb22d7c914e1 NO 60 Near perfect
Pac-Man Collection 5013b69cb05b21a1194ce48517df7bfc YES 60 Near perfect
Pac-Man Collection 40th 044657294450c869c45e7ef61f4870de YES 60 Near perfect
Planet Smashers 33aea1e2b6634a1dec8c7006d9afda22 NO 60 Near perfect
Plutos 86546808dc60961cdb1b20e761c50ab1 NO 60 Near perfect
Pole Position II 584582bb09ee8122e7fc09dc7d1ed813 NO 60 Near perfect
Popeye Demo 2.9 640c7827fe63082efbaffc13f7983744 YES 60 Near perfect.
Spire of the Ancients 19844117863cd38d4e1e4cbc867ae599 NO 60 Near perfect
Rampage ac03806cef2558fc795a7d5d8dba7bc0 NO 60 Near perfect
Realsports Baseball bfad016d6e77eaccec74c0340aded8b9 NO 53 A bit slow but playable
Robotron 66ecaafe1b82ae68ffc96267aaf7a4d7 YES 60 Near perfect
Scramble a3a85e507d6f718972b1464ce1aaf8a4 YES 60 Near perfect
Scrapyard Dog 980c35ae9625773a450aa7ef51751c04 NO 60 Near perfect
Serpentine 9bd70c06d3386f76f8162881699a777a YES 60 Near perfect
Space Duel 771cb4609347657f63e6f0eb26036e35 YES 60 Near perfect
Space Invaders 6adf79558a3d7f5beca1bb8d34337417 YES 60 Near perfect
Summer Games cbb0746192540a13b4c7775c7ce2021f NO 60 Plays fine - font hard to read on small screen.
Super Skatebordin 59b5793bece1c80f77b55d60fb39cb94 NO 60 Near perfect.
Super Circus Atariage 81cee326b99d6831de10a566e338bd25 YES 60 Near perfect
Time Salvo a60e4b608505d1fb201703b266f754a7 YES 60 Near perfect
Winter Games 3799d72f78dda2ee87b0ef8bf7b91186 NO 60 Plays fine - font hard to read on small screen.
Xenophobe 05fb699db9eef564e2fe45c568746dbc NO 60 Near perfect
Xevious d7dc17379aa25e5ae3c14b9e780c6f6d YES 60 Near perfect
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