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by Vitor Vilela Version 1.40
The SA-1 Pack is a package of patches for activating and optimizing the SA-1 system for the SMW ROM, with emphasis on eliminating slowdown, game limitations and accelerating the engine to the maximum possible.
SA-1 is a co-processor used on some special SNES games, made to work together with the Super NES CPU and enhance its processing speed, graphics and memory.
With its base 10.74 MHz clock, the SA-1 CPU is four times faster than the normal SNES CPU processing. The SA-1 CPU and SNES CPU also runs simultaneously, which can result in five times faster processing over game with a standard cart setup. With that much power, the Super Accelerator System (SAS) can be used to handle the SMW engine much faster than the normal, allowing more sprites to be processed at once, more in-game effects, faster level loading and much more.
The CPU also benefits from a better memory map controller, so it's does not get paused by WRAM refreshes and by HDMA updates, making the effective speed up to 7x faster than normal.
SA-1 Pack not just activates the co-processor, but also modifies a good part of the game engine to use and explore the chip features, which gives an extreme boost to the overall performance of the game.
SA-1 Pack is the most complex patch ever made to Super Mario World. It modifies pretty much the entire game, because the patch moves most of the game logic memory to another region which the SA-1 system can access and modify. In addition to that, a lot of the game routines are slight edited to call the SA-1 CPU during the most heavy operations and even make some of the routines run in parallel (SNES and SA-1 executing code at the same time, in parallel). Together that, some of the game enhancements involves some more deep modifying of the game engine, for example, the More Sprites enhancement, which expands the maximum number of sprites to 22 or the level limits expander, which makes it possible to have up to 255 sprites on a single level and much more...
Fortunately, that does not mean there will be game bugs. Although the patch is extremely complex, extensive tests and verifications have been done and the patch is stable and completely functional. In addition to that, when bugs are found they can be easily fixed without requiring making a new ROM port and updates are warranted to come quickly, as soon as possible when one finds a certain bug in most of the games.
The main implications when using the SA-1 patches are resource and emulator incompatibilities.
Any patch or tool made for editing Super Mario World must be designed to detect the presence of the SA-1 Pack and behave properly when the system is present on the ROM. The resource is responsible for using the correct memory mapping, RAM remapping and for calling the SA-1 CPU on its code, without having to the user manually modify it.
Tools made for editing graphics and music are exempt from this, unless if they edit the ROM directly as well.
Sprites and blocks must be converted for SA-1 compatibility as well, but you can download the SA-1 Convert Tool which allows converting them automatically for you.
Overall, the most important is checking for patch and tool compatibility. On
SMW Central, you can verify if a certain
resource is compatible or not with SA-1 by checking for thesa-1tag in the
submission information.
Lunar Magic has native SA-1 support since version 2.20.
For more information about converting a certain resource to SA-1 compatibility manually, check the docs folder and the technical files included, specially the Memory Map Summary.
SA-1 is an enhancement chip used on many SNES games. Although quite popular, unfortunately the SA-1 chip lacks proper emulation support for some of the known emulators available to download. Older emulators may not have some of the chip features implemented or may have unstable, slow emulation which can make the game slower, unstable or even completely unplayable. It's extremely important to use an accurate and updated emulator when playing not just regular SA-1 games, but any SMW hack with SA-1 Pack applied. Currently it's strongly recommended to play SA-1 games with Snes9x 1.56 or newer and bsnes/higan/ares. Older or different emulators may not work properly.
ZSNES in particular, while an extremely popular emulator (specially on the last decade), it lacks many SA-1 features and support, which makes it strongly not recommended to play games with. Although I still make (many) efforts for keeping reasonable compatibility with ZSNES, there's absolutely no warranty of performance and stability when playing SMW SA-1 games with it.
SA-1 Pack is fully compatible with real hardware. It works on both hacked SA-1 carts and sd2snes, with a good performance.
For more information about emulator and hardware compatibility, check out the Known Issues document.
As far working with SA-1 can be tedious at start (specially checking for resource compatibility), with the current development and available compatible resources, it's already doable to pretty much anyone who got a fair experience with SMW Hacking to use it.
In order to get started, grab a new clean ROM. Japanese or European versions will not work. If you already edited your ROM with Lunar Magic it won't work either.
Apply the sa1.asm patxh using Asar. You don't need to expand your ROM manually, the tool automatically does that for you.
Then feel free to test it with your preferred emulator. If it works properly, somewhere in your emulator it should display SA-1, e.g. ROM+RAM+BAT+SA-1 in Snes9x. If you're unsure, try editing level 106, change sprite header memory to 0x08 and insert 20 naked koopas in the level. If all of them display correctly, SA-1 Pack was successfully inserted.
Now you can apply all other patches/tools that should run before Lunar Magic. Remember that they should have SA-1 compatibility or else they will likely corrupt your ROM.
After it, you can now use Lunar Magic on your ROM. Remember to use at least version 2.20+.
To enable the double (22 sprites) system, don't forget to change your sprite header memory to 0x08, except in vanilla boss battles, they won't work correctly because of the new sprite memory system.
IMPORTANT: Since version 1.31 the sprite header index for activing the 22 sprites mode is now 0x08 and not 0x10 as it used to be.
In addition, if you change the GFX decompression option on Lunar Magic, you must reapply sa1.asm to your ROM so the proper fast GFX decompression routine is used. This is important for fast level decompression and compatibility with certain advanced resources.
SA-1 Pack wouldn't be that awesome without help from these people:
Special thanks also for all my patrons that supports my work, specially:
There's more documents and information available in the docs sub-folder:
Programming is a full guide about the wonderland SA-1 Pack programming and many special features you can use in your ROM hack. Additionally, how to convert any incompatible resource to SA-1 Pack compatible resource.
Notable Changes is a list of notable changes between a normal, SlowROM SMW ROM and a SA-1 Pack SMW ROM.
Known Issues is a list of currently known SA-1 Pack issues for each known SNES emulator and hardware. Issues varies between emulator bugs and SA-1 Pack bugs, which are properly marked for each case.
Memory Map Summary contains a summary about all memory changes between the normal SMW ROM and the SA-1 SMW ROM, either because of the SA-1 ROM mapping or SA-1 Pack memory remaps. Worth reading for who is interested in converting resources to SA-1 format or is interested in understanding how the patch works.
BW-RAM contains the map of all BW-RAM related addresses and information about its mapping capabilities.
I-RAM contains the map of all I-RAM related addresses and information about its mapping capabilities.
W-RAM contains the map of all SNES WRAM related addresses, focused in the differences between normal SMW WRAM map and SA-1 Pack WRAM map.
Sprite Remap is a summary about all the sprite table remaps made by More Sprites patch.
MaxTile contains the complete documentation how to use and explore the MaxTile system to the maximum power. It also contains explanation on how it works behind scenes.
remap.asm contains an .asm macro containing all SA-1 Pack related remaps for using in patches, blocks and sprites.
Useful documents for understanding SA-1:
You can contact make though the following links: