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Coin limit: Difference between revisions
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→Unbounded Coin Limit Glitch (Japanese version)
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A '''coin limit''' is the maximum number of coins that can be collected or saved in a given area. Some courses allow infinite coins to be collected. However, in the NTSC (American) version, the coin counter is programmed to stay at the maximum of 999. | A '''coin limit''' is the maximum number of coins that can be collected or saved in a given area. Some courses allow infinite coins to be collected. However, in the NTSC (American) version, the coin counter is programmed to stay at the maximum of 999. | ||
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==The 999 coin limit== | ==The 999 coin limit== | ||
The limit is intentionally put in by the programmers to prevent the game to count up coins greater than 999: | The limit is intentionally put in by the programmers to prevent the game to count up coins greater than 999: | ||
if (gMarioState->numCoins > 999) { | |||
if( | gMarioState->numCoins = 999; | ||
} | } | ||
When Mario reaches the 999 coin limit, the coins are no longer counted and collecting a coin only makes noise if the value of the global timer is odd. | |||
==The 255 coin limit== | ==The 255 coin limit== | ||
Separately, there is an unintentional coin limit involving the saved coin score. This value overflows and is set to 0 if the number of coins Mario collected in the course is a multiple of 256. (Not within the course, but when recording the saved coin score after Mario exits the course.) Thus, the easiest way to obtain the highest possible saved coin score in a level is to simply collect 255 coins. 511 and 767 also produce a saved coin score of 255, but collecting more than 255 coins is not as efficient as collecting a star when 255 coins have been collected. 1,023, 1,279, etc. also save as 255, but these coin scores cannot be obtained in the NTSC version. | Separately, there is an unintentional coin limit involving the saved coin score. This value overflows and is set to 0 if the number of coins Mario collected in the course is a multiple of 256. (Not within the course, but when recording the saved coin score after Mario exits the course.) Thus, the easiest way to obtain the highest possible saved coin score in a level is to simply collect 255 coins. 511 and 767 also produce a saved coin score of 255, but collecting more than 255 coins is not as efficient as collecting a star when 255 coins have been collected. 1,023, 1,279, etc. also save as 255, but these coin scores cannot be obtained in the NTSC version. | ||
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In the Japanese version, there is no coin limit within the courses. When the coin counter reaches a value of 1,000, the game runs a few lines of code wherein there is a typo: | In the Japanese version, there is no coin limit within the courses. When the coin counter reaches a value of 1,000, the game runs a few lines of code wherein there is a typo: | ||
if( | |||
if (gMarioState->numCoins > 999) { | |||
gMarioState->numLives = (s8) 999; //! Wrong variable | |||
} | } | ||
This should be the following: | This should be the following: | ||
if( | if (gMarioState->numCoins > 999) { | ||
gMarioState->numCoins = 999; | |||
} | } | ||
Because the lives counter is a signed short, the value of 999 overflows to -25. This is displayed in the HUD as "M25. | Because the lives counter is a signed short, the value of 999 overflows to -25. This is displayed in the HUD as "M25". (The "M" presumably means "minus".) | ||
After reaching a value of 32,767, the ''coin display'' remains at that value. After that, only the hidden ''coin count'' keeps incrementing. That is because the coin count is a signed short, so if the player collects more coins, the coin counter will overflow to -32,768. Since -32768 is not greater than 32,767, the coin display will not increment any further. If one were to collect a 65,636<sup>th</sup> coin (65,536 for the overflow and 100 for the star), a second 100 coin star would spawn. This was a part of a strategy that could have been applied to collect "To the Top of the Fortress" in 0x A presses<ref>https://youtu.be/GMOxYVtJhOI</ref> | After reaching a value of 32,767, the ''coin display'' remains at that value. After that, only the hidden ''coin count'' keeps incrementing. That is because the coin count is a signed short, so if the player collects more coins, the coin counter will overflow to -32,768. Since -32768 is not greater than 32,767, the coin display will not increment any further. If one were to collect a 65,636<sup>th</sup> coin (65,536 for the overflow and 100 for the star), a second 100 coin star would spawn. This was a part of a strategy that could have been applied to collect "To the Top of the Fortress" in 0x A presses,<ref>[https://youtu.be/GMOxYVtJhOI "WF Onto Tower 0x in Japanese Version" by UncommentatedPannen]</ref> but it wasn't because a faster 0xA strategy was discovered for that star.<ref>[https://youtu.be/M4M_OyUorRQ "SM64 - To the Top of the Fortress - 0x A Presses" by pannenkoek2012]</ref> | ||
==References== | ==References== | ||
<references/> | <references/> | ||
[[Category:Mechanics]] | |||