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 Post subject: N64 Gameshark fun
PostPosted: Sun Nov 23, 2008 3:17 am 
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Komrade
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Joined: Tue Mar 27, 2007 6:23 pm
Posts: 1354
Location: Mario Raceway, 1509.831, 217.198, -564.429
Title: Mario Kart 64 Hacker
I had a crazy idea, but it's not working out as well as I'd hoped. If you ever played around in the memory editor, especially after hacking it to view all 8MB, you might have noticed copies of your code list left in RAM, if the game hadn't cleared that area out, with the names and hex of the codes. If you could know consistently where the hex for a certain code would end up left in RAM, you could do like newer devices allow you do, and have a code like this:
81123458 080C
8112345A 8400
3C1B8034 2484
00640804 8D18
AF64B21D 0000
...you see where I'm going with this. Jumping right into that data left in memory. :D

Unfortunately when I tried this I didn't find any of my code list left in Mario Kart (and couldn't be arsed to try another game). I did, however, find some interesting leftover text that surprisingly I hadn't seen before. ROM flasher, checksum, etc. Also, the default code list the device ships with, even though I deleted most of it. I've found diagnostic screens in a few other devices by holding buttons at startup; I wonder if this had one to recover a corrupt firmware?

I could have been wrong about having seen my own code lists, rather than the default ones, left in memory, but it wouldn't make a lot of sense for it to clear out only that before booting. More likely the game just wiped out that area. Mario64 seems like a good candidate for this sort of buggery, but mine doesn't seem to want to start. :(

The ROM dump I have doesn't run in Mupen64. It hangs on all sorts of infinite loops waiting for some I/O registers to read certain values or something. Patching these eventually just crashed the emulator, but it did eventually get far enough to decompress/decrypt this text into RAM. If anyone's interested, I could send the save state file or RAM dump and maybe they could look for references to it.

Also, I noticed something that I don't remember ever actually working before. The reset button will restart the boot sequence, or go straight to the game without applying any patches if pressed in the menu. O_o

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 Post subject: Re: N64 Gameshark fun
PostPosted: Sun Jan 11, 2009 6:45 pm 
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Krew (Admin)
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Joined: Sun Oct 01, 2006 9:26 pm
Posts: 3765
Title: All in a day's work.
At one time I had the GS Pro ROM running in Nemu. It wasn't anything exciting. The one thing I did get out of it though was dumping the decompressed code, where I was able to find some of the additional code type infos that made it into EnHacklopedia. But of course, I ended up deleting it all and that was that. The only remainder of the project is already in the doc...

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 Post subject: Re: N64 Gameshark fun
PostPosted: Tue Apr 13, 2010 10:15 am 
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Kommunist
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Joined: Fri Oct 27, 2006 8:58 am
Posts: 19
Location: The glorious fishbowl of souls
You probably tacked on a bootstrap, altered a few ROM addresses, skipped all the PC comms stuff...

Oh, and since I know somebody will want this, here's decompressed copies of the five compressed files in a GS33 ROM. LZSS arithmetic. Try "shell.bin" first.
http://two.xthost.info/zoinkity/Datel/G ... amples.zip

I'm going through annotating a disassembly of both to work out exactly how it probes and handles it's hardware. 1EE00000 is used internally to write its own ROM, for instance.


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 Post subject: Re: N64 Gameshark fun
PostPosted: Sun Jun 06, 2010 10:44 am 
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Komrade
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Joined: Tue Mar 27, 2007 6:23 pm
Posts: 1354
Location: Mario Raceway, 1509.831, 217.198, -564.429
Title: Mario Kart 64 Hacker
Yes, there was a patched copy that would boot in Nemu or PJ64 IIRC, but they don't like to work under Wine.

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