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11-02-05 12:59 PM
Acmlm's Board - I2 Archive - - Posts by MathOnNapkins
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MathOnNapkins

Math n' Hacks
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Posted on 09-03-04 12:30 PM, in Lets Destroy Everything School Has Taught You! Link
I watched about 37 minutes of the (2 hr) seminar. It was pretty much what I expected. I don't respect the speaker, he appears to have a high school level background in science and yet he uses twisted, bizarre logic (and the Bible of course) to mock people who actually have a real education. That is just arrogant IMO.
MathOnNapkins

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Posted on 09-03-04 01:28 PM, in My CD player... Link
Why don't you ask the guy you bought it from?
MathOnNapkins

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Posted on 09-04-04 02:36 AM, in ...Ive got a cunning idea about the GBA Link
Originally posted by Smallhacker
My guess is that it's ported, not emulated, since an emulator would probably slow the game down a bit...


Probably not, the GBA's processor is quite fast.
MathOnNapkins

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Posted on 09-08-04 01:28 AM, in SWEDEN > AMERICA! Link
I'd normally vote Sweden because it's awesome, but I'm voting America b/c it also kicks ass and by the look of things people are expected to vote Sweden. I'm just a contrary mofo. :p
MathOnNapkins

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Posted on 09-08-04 02:57 AM, in Lets Destroy Everything School Has Taught You! Link
Originally posted by Nebetsu
I dont really want to prove Christianity here. What I want to do is make you Evolutionists out there admit that what you believe in is a religion.


Why should we? I'm not that into evolution, but a rational look at the world makes it seem somewhat plausible. Evolutionism has no relation to spirituality, apart from any spirituality externally applied to it by individuals. Same goes for the big bang. Nor are these metaphysical theories. It's just some scientists giving their best guesses about some areas of scientific study. Those happen to be fairly well popularized. Some string theorists have proposed that the world is composed of 11 dimensions. Does that conflict with the bible? (ONO 12 - 1 = 11, satan!).

Anyways, a lot of people seem to think that you can actually "prove" that something is physically true in a very real sense. In reality, science is empirical, and theories are based upon observations most of the time. Quantum mechanics tends to be a special case, where math weirdos spend hours coming up with theoretical models and then they go into the field to test them.

You see, the only type of enterprise where you can prove without a shred of doubt whether something is true is philosophy (same as mathematics). And the only reason that undeniable proof can be given in those systems is that they are built around statements that are by the initial construction, true. (aka axioms.) But that kind of proof is more or less useless in the real world b/c you don't know if the assumptions you picked are actually true for the real world.

So you could get people to agree that evolutionism, big bangism, and the like are BELIEF SYSTEMS, but never a religion. Primarily b/c they have nothing to do with spirituality.
MathOnNapkins

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Posted on 09-08-04 03:00 AM, in Happy 6th birthday to Google! Link
Originally posted by Jarukoth
*Plays Final Fantasy victory music*

Google: Making Porn Easier to Find Since 1998.


Is that free porn?

... or just porn?
MathOnNapkins

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Posted on 09-08-04 05:35 PM, in A flash about Bush and Kerry Link
I've never actually needed to watch this on my computer, because the news has played it like 800 times. And always in the context of the original author of "This Land is My Land" possibly taking legal action against the guys who made the flash. Think it was Arlo Guthrie.

But yeah, this is actually pretty old... I thought it was old 7 weeks ago.
MathOnNapkins

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Posted on 09-08-04 05:40 PM, in Im board od hacking pokemon......... Link
You're apparently also bored of spelling correctly.
MathOnNapkins

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Posted on 09-09-04 01:10 AM, in Important: giving rom-hackers self-confidence Link
What kind of idiot makes a rom hack for himself, knuck? OMG I'm going to spend all this time and frustration.... but only I can play it. On the other hand, we should be more supportive of people who finish and release their hacks. But it works both ways, if you want me to give you some props you ought to make your hack stand out in some way.
MathOnNapkins

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Posted on 09-10-04 02:00 AM, in ram to rom adressing Link
Some terminology:

Given a long cpu address $1F5046 we must split it up into two parts:

1F | 5046

The first number, #1F is called the bank. The portion on the right is called the absolute part of the address.

If you are looking at the address in a hex editor, then yes the bytes are written in reverse order.

For example: AD 05 F6 is machine code for LDA $F605

Ex 2: AF 00 90 06. This corresponds to LDA $069000.

First of all, just delete the 200 byte rom header. Removing it affects nothing, and subtracting #200 all the time gets tedious.

$069000 is a CPU address, so to convert that to a rom address, you look at the bank number. In this case, it is #06. Here's how I do it. If the bank number is even, as in this case, the corresponding digits in the rom address will be half of that. So the rom address at this point looks like $03????. Since the bank is even, we have to subtract #8000 from the absolute portion of the address (#9000). Thus we get #9000-#8000 = #1000 = #????. The finalized rom address is therefore $031000.

On the other hand, say we have an odd bank. Ex. 3: BF 05 A5 1B

This corresponds to LDA $1BA505, X. The (, X) part is not important for this explanation.

To find the highest two digits for the rom address we still divide the bank (#1B) by two, except we discard the remainder. So #1B/2 = #D remainder 1 -> #D b/c we discard the remainder. What that 1 really represents is #8000 bytes but don't worry too much about that at this point. To simplify things, I just remember not to subtract those #8000 bytes in the case that the bank is odd. Therefore, we just write the rom address as $0DA505.

Summary: even bank - halve the bank and take that as your highest two digits. subtract #8000 bytes from the absolute address.
odd bank - halve the bank and discard the remainder. Don't subtract #8000 from the absolute address.

You can get programs that will do this for you but when I'm working I don't have time to plug numbers into a program so I've gotten good at calculating them mentally. To derive a cpu address from a rom address is very similar.

Suppose we are given $030000 as a rom address. Look at the absolute portion, #0000. It is less than #8000, so we need to double the "bank" (not really a bank but the top two digits) and get #6. Then add #8000 to the absolute address. Result: $068000.

If we are given $038700 as a rom address, then we need to realize that this came from an odd bank (the last rom address obviously came from an even bank). In case you haven't caught on yet, note that the the absolute portion is at least #8000. That tells us it came from an odd bank. Thus, we need to double the bank to get #6 but we need to add back that remainder of 1 that was thrown away in calculating a rom address. So the bank will actually be #7. Since this came from an odd-banked cpu address, #8000 was never subtracted from it, so we again leave the absolute portion alone. Result: $078700.

While this may seem complicated, that is the extent of the Lo-Rom addressing scheme in terms of conversion.

Most of the confusion over Lo-Rom addressing is the fact that its banks are #8000 bytes long. Technically they are 64K long, but code is only mapped into half of that. The lower #8000 bytes are used as memory. However, the SNES doesn't have enough memory to fill up all those banks, the lower #8000 bytes of each bank are actually identical to the values of the lower #8000 bytes of bank $7E, which is a full bank in the sense that it is a full 64K instead of the 32K banks. $7F is the same way, and these make up the 128K of memory that the snes has. Lastly, $70 is a special bank where you can write to the save game memory (SRAM). Most people have heard this called battery backup. Other than $7E, $7F, and $70, there are no other special banks to read and write memory in. Everything else is read only (i.e. code).

Finally going back to the actual content of your question, if you write LDA $0FFF you should generally assume that this means load A from $7E0FFF. There are times when the Data Bank register is changed to $7F or $70 and in those cases the same instruction would correspond to $7F0FFF or $700FFF.

I'm not very swift. You'd laugh if you knew how long it took me to figure all this out.


(edited by MathOnNapkins on 09-09-04 05:08 PM)
(edited by MathOnNapkins on 09-09-04 05:10 PM)
MathOnNapkins

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Posted on 09-10-04 02:14 AM, in Im board od hacking pokemon......... Link
While it is listed as an FF game, Final Fantasy Adventure is in reality Seiken Densetsu I. (Secret of Mana 0) That might be worth taking a look at in terms of hacking.
MathOnNapkins

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Posted on 09-10-04 02:22 AM, in SWEDEN > AMERICA! Link
Originally posted by Simon
Guess what I voted for

Anyway, Sweden has a much lower crime rate than the US, probably mostly because not any one can buy or carry weapons as they please here.


Heh, I have a friend in Sweden, and that is exactly why he hates Sweden so much. He wants to come here (US) and open a gun/ explosive store.
MathOnNapkins

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Posted on 09-10-04 02:29 AM, in Lets Destroy Everything School Has Taught You! Link
Ok so logic doesn't exists. I'll admit it.
MathOnNapkins

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Posted on 09-10-04 03:51 AM, in Lets Destroy Everything School Has Taught You! Link
I think I already pointed out that physical existence proofs are impossible. But if logic is a given, then proofs based on definitions and other rules are possible.

Proving stuff like "I exist" or "logic exists" to me is trivial because I participate in both everyday. I don't care whether they exist or not, they seem to get the job done so I can go on with my life. Most philosophers I know of do not focus on the question of whether we exist, but rather if what we experience differs from the way the world actually is. (appeances, perception, impression vs. reality)
MathOnNapkins

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Posted on 09-10-04 08:45 AM, in ram to rom adressing Link
Go Fu.

Yeah I knew that the area around $2000 and above was hardware, and there are memory maps out there if you google it, but I wasn't too sure about the usage of those since I never had to mess with those regions.

That is, other than the hardware registers that handle DMA, HDMA, and other screen settings, I don't remember the memory mapping for the higher regions.


(edited by MathOnNapkins on 09-10-04 12:10 AM)
MathOnNapkins

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Posted on 09-10-04 09:59 AM, in Ever had one of -those- days? Link
There have been some semesters of college where I would be determined to go to class no matter what. So I'd end up going on three hours of sleep per day for days on end. Now that is fine if you have nothing but physical work to do, but it doesn't mix well with school. Nowadays I just make myself crash at like 9pm or 10pm many nights. Of course that is not always feasible, b/c I'll be hanging out with people and I would never crash that early around them. But life is so much more bearable when you're rested. If you can't sleep, then do what it takes to get to sleep and on a normal schedule. NyQuil is good to get started, but not to be used as a sleep aid on a regular basis.

In any case, it's much easier to deal with being behind in your work when you're well rested. Staying up and worrying do you no good. I remember my freshman year I was so worried about a diff eqs test I had to take that I ended up staying up the whole night. I actually aced the test but that doesn't always happen. When I took my Calc three final I went with no sleep and actually fell asleep during the test. Woke up with an hour left and had to bust ass to get most of the problems done.

Changing your lifestyle can make a big difference in your attitude towards your responsibilities. Saying "fuck it" all the time is a route I've taken, and it's cost me in grades before. If I had only gotten more sleep and wasted less time on the internet I might have handled it differently. Self discipline is hard but it's really invaluable.
MathOnNapkins

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Posted on 09-11-04 04:01 AM, in Coin Quest Update (no demo) Link
All I have to say is:

Spoiler:

Jesus Christ.
MathOnNapkins

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Posted on 09-11-04 05:26 AM, in Waluigi's Adventure (100% Complete) Link
Originally posted by Smallhacker
Originally posted by Surlent
what I'm wondering is that reversed "L" on the top of the screen


It's Waluigi's Adventure. The upside down L can be found on Waluigi's cap. (Wario's cap have got Mario's "M" upside down, which becomes "W". Waluigi have got Luigi's "L" upside down.)


(Edit: I'm not 100% about the "war" + "mario" = "wario" thing, but it makes more sense than it coming from "warui, b/c the stem is "waru", to the best of my knowledge.)

I hadn't heard of a Waluigi until a while ago. I find it kind of odd that Mario's evil counterpart is Wario, which is a blend of the english "war" and Mario, whereas Waluigi is a blend of "warui" = bad, evil in japanese and Luigi.

With that upside down L on his hat, I want to call him Guigi, since that's the upper case greek gamma symbol. Strangely enough that sounds pretty close to Googie. Is this a conspiracy?


(edited by MathOnNapkins on 09-10-04 08:29 PM)
MathOnNapkins

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Posted on 09-12-04 12:52 AM, in Ever had one of -those- days? Link
Originally posted by Ailura

And in my experince, I don't get that sleepy when I skip a night. However I try to listen on alot of music and I try not taking a small nap. A small nap easily turns into hours for me.


I don't know about y'all, but passing out at my computer keyboard for about 5-30 minutes does wonders. I feel incredibly refreshed. I remember one particular time when I was playing FF tactics for like 20 hours. I was so fucking tired and then I did that and passed out. Woke up and went on to play another 10 hours, like it was nothing.

Now if you get me into a bed, it's a far different story. I won't wake up for probably 5 hours at least.
MathOnNapkins

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Posted on 09-12-04 01:03 AM, in Happy September 11th! ^_^ Link
Incidentally I already had a BBQ today. The one thing that sucks about the terrorist attacks on this date is that it's my grandmother's birthday, who happens to be my favorite relative of the family. Makes it hard to celebrate.
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