SMB 1 Music Data Information

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Main - ROM Hacking - SMB 1 Music Data Information

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GameGenie81

Posted on 10-05-08 07:25 AM (rev. 2 of 10-05-08 08:18 AM)

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When I enter a cloud level in Super Mario Bros., the resulting syntaxes in the ROM code I discovered are:


ChkAreaType:
$9106: AC 4E 07 - LDY $074E = #$01
$9109: AD 43 07 - LDA $0743 = #$03
$910C: F0 02    - BEQ $9110
$910E: A0 04    - LDY #$04
StoreMusic:
$9110: B9 E7 90 - LDA $90E7,Y @ $90E7 = #$02
$9113: 85 FB    - STA $FB
ExitGetM:
$9115: 60       - RTS

Why does the RAM address that points to "CloudTypeOverride" have a result of #$03 that is stored in the A register; which follows the previous RAM instruction that points to "AreaType" which retains the then-current result that is #$01, or "GroundMusic," in the Y register?

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Dan

Posted on 10-05-08 11:44 AM

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Why don't you just create one thread with all your Super Mario Bros questions in it?

GameGenie81

Posted on 10-05-08 07:09 PM

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Posted by Dan
Why don't you just create one thread with all your Super Mario Bros questions in it?

That's a clever idea.

Now to copy my original post to that...

~Ben

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Kawa

Posted on 10-05-08 08:22 PM

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Why does this thread make me want to facepalm? What's stopping you from using just this thread? The name? Contact an admin to rename it.

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frantik

Posted on 10-06-08 02:12 AM

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Why does the RAM address that points to "CloudTypeOverride" have a result of #$03 that is stored in the A register

because there was a STA CloudTypeOverride when the accumulator was 4 somewhere else in the program? your question isn't very clear as to what you're trying to get at

the code checks to see if cloud type override is 0. if it's not, Y is set to a different value to cause the offset used in B9 E7 90 - LDA $90E7,Y @ $90E7 = #$02 to be different and load the different music

look at the smbdisassebly's comments for insight into the code it's very complete

GameGenie81

Posted on 10-06-08 03:55 AM

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Posted by frantik

Why does the RAM address that points to "CloudTypeOverride" have a result of #$03 that is stored in the A register

because there was a STA CloudTypeOverride when the accumulator was 4 somewhere else in the program? your question isn't very clear as to what you're trying to get at

the code checks to see if cloud type override is 0. if it's not, Y is set to a different value to cause the offset used in B9 E7 90 - LDA $90E7,Y @ $90E7 = #$02 to be different and load the different music

look at the smbdisassebly's comments for insight into the code it's very complete

The next two instructions after the CloudTypeOverride instruction are:
$910C: BEQ StoreMusic
$910E: LDY #$04 (CloudMusic)

If the level is not a cloud type, then skip to StoreMusic.

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frantik

Posted on 10-06-08 08:25 AM (rev. 2 of 10-06-08 08:26 AM)

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Red Koopa
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yes, and if the level is cloud type, set y to 4 before proceeding to store music...

here's some pseudo code of the asm, but it's not particularly tricky or anything

ChkAreaType:
Y = area type; - sets y to level type
A = Cloud type override; - checks to see if cloud level
if (A == 0) goto Storemusic: - if not cloud level, store music, else
Y = 4; - set y to 4
Storemusic:
A = valueAtMemoryLocation(0x90e7 + Y); - load music type number
$FB = A; - store in $FB which is used by music loading routine to determine song type)
return;

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