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Acmlm's Board - I2 Archive - General Emulation - ZST file format?

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Smallhacker

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Posted on 03-31-05 04:33 PM

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I've searched a bit, but I can't find it.
Does anyone know the ZSNES savestate file format?

creaothceann

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Posted on 03-31-05 08:58 PM

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http://oregonstate.edu/~robinsfr/docs.html

db = byte, dw = word, dd = double word.

The following data is part of "tempdat":

KeyOnStA	db 0
KeyOnStB	db 0

SDD1BankA	db 0
SDD1BankB	db 0
SDD1BankC	db 0
SDD1BankD	db 0
vramread2	db 0	; previous character for vram read
nosprincr	db 0
poamaddrs	dw 0
ioportval	db 0
iohvlatch	db 0
ppustatus	db 0

Smallhacker

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Posted on 03-31-05 09:31 PM

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Thanks, but since that document is next to unreadable to me, can anyone tell me at what address the RAM memory starts?

(edited by Smallhacker on 03-31-05 11:31 AM)

creaothceann

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Posted on 03-31-05 11:30 PM

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This should be at offset 0090F1EF.

Smallhacker

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Posted on 04-01-05 01:34 AM

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Thanks again.

HyperLamer
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Sesshomaru
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Posted on 04-01-05 05:33 AM

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Start addresses are easy to find. Use AR/GS codes to modify the first address to something easily-recognizable.

Smallhacker

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Posted on 04-01-05 10:08 AM

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Guh... Why didn't I think about that?

creaothceann

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Posted on 04-01-05 07:20 PM

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Originally posted by creaothceann
This should be at offset 0090F1EF.

Sorry, that's wrong.

The correct one is offset 0C13 (hex) or 3091 (decimal).

I need to check my tools...

Gideon Zhi

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Posted on 04-02-05 09:11 PM

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That's basically correct. The first C13 bytes contain header information appended to the file by ZSNES itself.

What follows is 128 kilobytes of WRAM. $C13-$10C12 contains WRAM bank $7E $10C13-$20C12 contains WRAM bank $7F. If you're looking for (for example) statistical data in an RPG, it'll be somewhere in that range, but it'll change drastically between games as you are probably aware.

The 32 kilobytes following ($20C13-$28C12) are where VRAM is stored. This is mainly picture data, but there's tilemap stuff in there too - could be useful if you're trying to find layout data in a ROM. The rest of it I'm not sure about - some of it contains the graphical data for the preview, and I'm not sure where the sprite tables get stored. That'd probably be something useful for me to learn at some point...

creaothceann

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Posted on 04-04-05 04:31 PM

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Originally posted by Gideon Zhi
The 32 kilobytes following ($20C13-$28C12) are where VRAM is stored. This is mainly picture data, but there's tilemap stuff in there too - could be useful if you're trying to find layout data in a ROM. The rest of it I'm not sure about - some of it contains the graphical data for the preview, and I'm not sure where the sprite tables get stored. That'd probably be something useful for me to learn at some point...

The size of VRAM is 64 KB, and the sprite data is in OAM. Tilemap addresses are in bg?ptr and tile addresses in bg?objptr.
The preview data (64x56 16-bit pixel) is in the last 7168 bytes, or may be missing...

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