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 LSDJ RAM Dump stuff
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roger
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« on: June 30, 2015, 06:21:25 PM »

LSDJ is a tracker for the Gameboy that allows players to create their own chiptunes with it. I've done quite a bit of music with this nifty piece of software and I can say it's pretty dang awesome. Unfortunately, being a Gameboy game, it's completely inaccessible outside of memorization. So I may be writing a specific GB emulator that will allow blind musicians to explore this pretty awesome tool.

I may just make it so that you can write your own files and then just load it into VBA but whatever, I found these, so have fun.

Anyways, I'm dumping my findings here, so hopefully someone else finds it useful.

LSDJ Memory Values:

0xB290-0xB68F

On the SONG screen, these values include the values of the various Chains.

These values do NOT reflect the actual values on any other screen. This should only be referenced when SONG is the active screen.

Each 4 bytes indicates a row of Chains. For example, the first byte in a set of 4 is PU1, then PU2, then WAV, then NOISE. Then it repeats until reaching FF.

These values seem to be stored elsewhere when not on the SONG screen, but I can't find them.

Idea: Extract these values when SONG is first loaded and place them in an array for quick access while on this screen, and flush the array when the screen changes.

0xA080-0xA87F

On the CHAIN screen, these values include references to various phrases.

These values do not reflect the actual values on any other screen. This should only be references when CHAIN is the active screen.

Each 16 bytes reflects a single chain. Chain 00 starts at A080, chain 01 starts at A090 ect.

These values are stored elsewhere but I can't find them.

Idea: Extract these values when CHAIN is first loaded and place them in an array for quick access while on this screen, and flush the array when the screen changes. Only reference the CURRENTLY SELECTED CHAIN.

0xA880-0xB07F

On the CHAIN screen, these values are the pitch offset for each individual phrase.

Similar to the references to the phrases, each 16 bytes corresponds with each chain. So A880 is chain 00, A890 is chain 1 ect.

0xA000-0xAFEF

On the PHRASE screen, represents the various notes. C3 (the lowest note) is represented with 01 while the highest note, B8, is represented by 48.

This has a weird update format. When deleting a note, it completely erases all the notes. This also occurs if you insert the same note. Adding the same instrument clears the memory as well. The list is resorted when you change the current note.

Each 16 bytes represents a single phrase. A000 is Phrase 00, A010 is phrase 01, ect.

0xC0AD

Current screen. Values correspond to:

01 - PHRASE screen
02 - GROOVE screen
03 - CHAIN screen
04 - SONG screen
05 - TABLE screen
06 - INSTRUMENT Screen
08 - FRAME screen
09 - PROJECT screen
0A - BANK screen

I might be missing a few, it's always tricky to go and figure this one out. lol

0xC1EF

5 character string representing currently selected instrument's name. Only applicable on INSTRUMENT screen.

The following are values that monitor the cursor. They stay the same when switching screens unless otherwise specified.

0xC1CC

PHRASE screen:

Horizontal cursor position. Starts at 1. 1 is note, 2 is instrument, 3 is type of modulation and 4 is modulation modifier.

0xC1CD

PHRASE screen:

Vertical cursor position.

0xC1D2

CHAIN screen:

Horizontal cursor position. 0 is chain, 1 is transpose.

0xC1D3

CHAIN screen:

Vertical cursor position.

0xC1D7

SONG screen:

Horizontal cursor position.

0xC1D8

SONG screen:

Vertical cursor position.
« Last Edit: June 30, 2015, 07:23:15 PM by Seto Kaiba » Logged

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Cbox
July 18, 2018, 10:49:52 PM
roger: I can post but it goes to an error page when I submit.
July 18, 2018, 05:24:12 PM
zman9000: Site is back WOO!
May 09, 2018, 12:35:37 AM
KyleRunner: The "Start In" field is not editable... I'll try making new shortcuts
May 08, 2018, 09:51:08 PM
Fox: If all else fails, you canmake new Shortcuts to do the same thing.
May 08, 2018, 09:49:53 PM
Fox: Export Properties > Shortcut (Tab) > Target / Start In ; Target (for Export) should be: (filename) 0 , and for Import: (filename) 1
May 08, 2018, 08:52:00 PM
KyleRunner: I can't change the path in properties menu...
May 08, 2018, 01:27:19 AM
Fox: You may need to edit something in properties, though... so it uses the exe file in the same directory.
May 08, 2018, 01:24:59 AM
Fox: It is suppose to be a shortcut, yes.
May 03, 2018, 11:48:05 PM
KyleRunner: Fox, the "export" function in your text editor is just a shortcut... Could you please fix it?
May 02, 2018, 09:53:45 PM
KyleRunner: I come here everyday. I'm working on a Portuguese translation, and the people here help me a lot.
May 02, 2018, 08:56:07 AM
Drake baku: My feel as well, I posted a little as well since my return, but silence was all that followed... At least the forum is a great source for data when hacking GS/ GS2, currently looking for something I have read a long time ago cause my PP recovery psy is not working
May 01, 2018, 09:58:04 AM
Fox: I am thinking a lot of this might be because of Discord?
May 01, 2018, 09:56:08 AM
Fox: Yeah, this forum is more dead than ever before.  February and April have 0 new topics. (All other months prior have more.) And March has lowest number of new posts. (It'd be dumb to count the very first month this site was created.)
April 25, 2018, 09:02:13 PM
Fox: Yes. The best tool is a hex editor. Well.... VBA, VBA-SDL-H, no$gba Debugger, GBATEK, and my documentation.... to use these to learn how the code/data works. Best method because it maximizes your editing ability... and then there is my program gsmagic that I was working on. Still in its early stages, though. (Even after year(s).)
April 25, 2018, 04:21:58 PM
Xendrox D: *exept tla editor.
April 25, 2018, 04:21:29 PM
Xendrox D: is there any other tool for hacking gs?
April 23, 2018, 09:26:27 PM
Atrius: Rarely, but not never.
April 23, 2018, 08:01:48 AM
Drake baku: Can it be, the god who created the editor, atrius. I heard you never came back online here anymore
April 20, 2018, 02:46:36 PM
KyleRunner: Atrius!!
April 19, 2018, 11:29:46 PM
Atrius: @Fox, I tried, but for some reason Mario Golf won't boot, and Mario Tennis crashes when you patch out the text compression, and I'm not sure why...  The normal text loading functions in them are basically the same as the ones in the Golden Sun games.

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