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Jul - The Cutting Room Floor - A lot of debug modes New poll - New thread - New reply
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CaH4e3
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Posted on 03-08-11 02:37:11 PM (last edited by CaH4e3 at 03-09-11 02:39 AM) Link | Quote
just repost it here, probably someone could find something from there useful, just haven't so much time and patience to check that all myself, anyway, I have a lot of thing to do with NES after all

Results of my relative search tool in GBX romset for words "SOUND TEST", "BGM TEST", "DEBUG", "CHEAT". Some verified cheats and debug modes are at the end of file.
The same just for "DEBUG" string.
The same for "SOUND", "TEST", "MODE", "BANK", "MUSIC" words.
The same but for SMD romset and words "DEBUG" and "CHEAT".
Results from another tool, looking for particular byte sequences in NES files. Some of them might be working or disabled key-code sequences for still unknon cheats. All found sequences was checked for cross-refrences in file to that sequences by checking particular opcodes...

Many of that data just a random garbage or parts of used strings or data, but some of them might be real unknown unused debug and cheat stuff.
Rick
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Posted on 03-08-11 03:41:18 PM Link | Quote
I'd be interested, but with me being a total programming dummy, I'm not sure what to make of them.

87A5: AND $87A9,Y -> 000147B9: 01 02 04 08 10 20 [Bad News Baseball (U) [!].nes]

So I'm guessing that either the first set of digits (87A5) or the third (000147B9) is where the code is stored? And the 01 02 04 08 10 20 is what would correspond with the button presses you'd have to use to activate it?

If I can figure out how these work, I'd be really interested to jump head first into these.

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CaH4e3
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Posted on 03-08-11 05:10:55 PM (last edited by CaH4e3 at 03-08-11 02:23 PM) Link | Quote
first one - address in cpu address space
second one - ines file offset for the sequence

first of all we are looking for any sequence consists of bytes 01 02 04 08 10 20 40 either 80, when done, we have ines file offset, first 12 bits of it (minus 0x10) are the same as any of possible runtime addresses, assuming that opcode for reading that sequence is somewhere near, we look for any appropriate opcodes and check if it's arguments have the same 12 lower bits. so we have most possible real offset, and now know higher bits of address, just look for opcode offset, apply higher bits and gotcha!

As for Bad News Baseball, most probably it is not the cheat. mostly sequences like 01 02 04 08 10 20 40 or 80 40 10 08 04 02 01 is used in POW functions, calculating number of any non zero bits or test some bits by it's numbers.
Rick
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Posted on 03-08-11 05:23:52 PM Link | Quote
Would I be able to correspond certain digits to a button press? For instance, "01" being "Up, "02" being "Down", etc.?

I was thinking of just kind of trying button presses on random screens to see if that would do something.

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CaH4e3
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Posted on 03-08-11 05:27:38 PM (last edited by CaH4e3 at 03-09-11 04:16 PM) Link | Quote
Most frequently used A B Select Start Up Down Left Right for 80 40 20 10 08 04 02 01, but many of them using reverse order.

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lol
CaH4e3
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Posted on 03-08-11 05:32:29 PM Link | Quote
Originally posted by Rick
I was thinking of just kind of trying button presses on random screens to see if that would do something.

it's mostly unuseful. a lot of codes need to be enabled, or pressing particular button before entering code or just be disabled at all like Konami Code in Rampart, etc. On top of that there is a lot of cases when incorrect entering disables further attempts or works only after start is pressed lol...

so, for looking into that you need debugger for sure. at least to watch RAM for any counters changing while you press something... most valuable part of that log not actually sequence, but opcode offset...
Rick
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Posted on 03-08-11 05:38:55 PM Link | Quote
Damn, this is probably gonna be out of my knowledge range for a bit anyway. =/

Well, no time like the present to learn I suppose! I'll have to study up on this.

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andlabs
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Posted on 03-09-11 03:26:12 AM Link | Quote
I can look at SMD games, however keep in mind that SMD games do not always have to have their text as plain ASCII or Shift-JIS in the ROM — in fact, they don't even have to be text at all! But this list will help coordinate things to look at, thanks.
CaH4e3
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Posted on 03-09-11 05:32:35 AM Link | Quote
Originally posted by andlabs
I can look at SMD games, however keep in mind that SMD games do not always have to have their text as plain ASCII or Shift-JIS in the ROM — in fact, they don't even have to be text at all! But this list will help coordinate things to look at, thanks.

If you look at this carefully, there it not only aSCII strings, it's relative search tool results, but for sure I just wanted to find 1-byte encoding strings. Japanese texts and texts with scrambled character order is way too hard to automatic search. In fact, there is a lot of such cases and for the NES too lol, I didn't planned to cover all possible cases, as soon as current results is more than enough.

If you like, I can post results of some relserch for kanji strings lol

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Posted on 03-16-11 10:26:03 PM Link | Quote
Many of those games in your SMD document have had their button cheats or debug modes found. Gaming sites like GameFAQs and GameWinners house a lot of new and unknown codes (GameWinners.com especially). However, a lot of them are fake to an extent that the methods of activating them is wrong. I'm not the bragging type, but I found all of the button cheats for the Vectorman games and a couple others posted on tcrf.net (MediEvil and Crash Bandicoot, for example).

But as I was skimming through the document, something told me to check that Aaahh! Real Monsters game. I had a look at its entry on the wiki, and saw that picture of Jim Schuler and Dave Connelly. That picture was also used for a hidden scrapbook video on a Saturn game of theirs. I'll find the game and record a video of it.
CaH4e3
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Posted on 03-19-11 07:38:06 AM Link | Quote
So why I need someone who can check these lists and at least get rid of those entries which is already known...

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Posted on 03-20-11 03:15:04 AM Link | Quote
I had just skimmed through the list, but I'll check it out.
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Jul - The Cutting Room Floor - A lot of debug modes New poll - New thread - New reply


Rusted Logic
Acmlmboard - commit 47be4dc [2021-08-23]
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