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+--- Thread: Using Mem81 to Auto-Clear Data for ASM Codes (MKWii only) (/showthread.php?tid=1107)
Using Mem81 to Auto-Clear Data for ASM Codes (MKWii only) - Vega - 03-18-2019
Using Mem81 to Auto-Clear Data for ASM Codes (MKWii only)
NOTE: This is an MKWii specific 'feature', this most likely won't work for other Wii games.
NOTE: For beginner ASM Coders that have already been utilizing the Exception Vector Area in previous codes.
Let's say you have an ASM code that originally stores data/values to the Exception Vector Area. You wanted these values to clear after every race. So you write another ASM code (that occurs only in between races) to zero/null out all the values.
Seems pretty silly to write another whole ASM code just to clear values. Instead of storing your data/values to the Exception Vector Area, you store them to Mem81. Mem81 auto-clears after every race/battle. The only time is doesn't auto clear is pressing restart in TT mode. I don't know the entire exact allowable region of Mem81 but here is a LARGE chunk used many various codes over time and I have seen no issues with any of those codes' functionality.
0x81400000 thru 0x81701000
As you can see this is a very large region of memory to have at your expense. And there you go, a great place to store values that need to be cleared per race. Happy coding!
RE: Using Mem81 to Auto-Clear Data for ASM Codes (MKWii only) - Zeraora - 07-11-2023
Hey! Not to bump an old thread for no reason but, just to provide some bit of knowledge.
If you are using an LE-CODE distro, LE-CODE does use a portion of Mem81 (the exact size I don't know but, it seems to be between 0x81400000 - 0x814D0000) which can cause information to get written over your existing codes.
It seems to be written around the start of a race (right when objs are loading). You might be able to write mid race for certain conditions but, I highly recommend finding a portion that isn't being used.