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1 user currently in Super Mario World hacking:  labmaster |
| Acmlm's Board - I2 Archive - Super Mario World hacking - Learning SMW ASM [ASM howto] |
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HyperLamer <||bass> and this was the soloution i thought of that was guarinteed to piss off the greatest amount of people Sesshomaru Tamaranian Level: 118 Posts: 5311/8210 EXP: 18171887 For next: 211027 Since: 03-15-04 From: Canada, w00t! LOL FAD Since last post: 2 hours Last activity: 2 hours |
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If you tell them it will teach them ASM, they will come.  |
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mikepjr Ninji Level: 26  Posts: 165/242 EXP: 92006 For next: 10269 Since: 03-15-04 From: houston texas Since last post: 4 days Last activity: 1 hour |
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| Question time!!!! Ok, im trying to disable the time all togethor. Ok, here is my problem. What is this thing about BNE and BRA? 52F1: ASM that handles the 'TIME UP!' message. You can change the 'BNE' opcode to a 'BRA' to disable it. Not sure what that means. I do need to know thogh because i want to disable time in my hack. Oh, and im useing Hex Workshop. |
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Sukasa Boomboom Error 349857348734534: The system experienced an error. Level: 57  Posts: 1025/1981 EXP: 1446921 For next: 39007 Since: 02-06-05 From: *Shrug* Since last post: 6 days Last activity: 1 day |
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| Mike, just change 0x103F to 50 to disable the timer. | |||
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mikepjr Ninji Level: 26 Posts: 166/242 EXP: 92006 For next: 10269 Since: 03-15-04 From: houston texas Since last post: 4 days Last activity: 1 hour |
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| Ok, will that also get rid of the TIME UP? | |||
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Sukasa Boomboom Error 349857348734534: The system experienced an error. Level: 57 Posts: 1028/1981 EXP: 1446921 For next: 39007 Since: 02-06-05 From: *Shrug* Since last post: 6 days Last activity: 1 day |
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| No, but the time will not count downwards. | |||
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mikepjr Ninji Level: 26 Posts: 167/242 EXP: 92006 For next: 10269 Since: 03-15-04 From: houston texas Since last post: 4 days Last activity: 1 hour |
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| Well, i was asking because i already did that, and i just checked it and it still shows it, unles i give it time in the game. And then the blasted thing still wants to add up the time to the score at the end. These are the things i am trying to get rid of. Timer and TIME UP message. The score tallying at the end of every level. That blasted fadeing at the end of every level. My hack will be pure exploration. The only thing to give you score are the monsters and what not. I also would like to get rid of the star thing that come from toching the tape. And that is it. (edited by mikepjr on 06-27-05 09:09 PM) |
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Glyph Phoenix Level: 39  Posts: 316/745 EXP: 385876 For next: 18895 Since: 11-07-04 Since last post: 2 hours Last activity: 2 hours |
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| The BRA opcode has a hexadecimal equivalent of 80. During the tutorial I skipped the three letter opcodes completely. I find the hex numbers and their equivalents far easier to manage. If you're using an assembler or disassembler three letter opcodes are necessary, but they just get in the way if you're editing with hex. |
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mikepjr Ninji Level: 26 Posts: 169/242 EXP: 92006 For next: 10269 Since: 03-15-04 From: houston texas Since last post: 4 days Last activity: 1 hour |
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| Hmmmmmmmmm, is what i would say if i understood that. lol Ummm, well then what is BNE if BRA is 80. I mean why even explane it that way if no one really looks at it that way? I ask because that is what it says a few threads down. But since i have been useing Hex Workshop i have been unable to type in BNE or anything like that, but i guess that would explane it. Sooooo now im stuck. I have to know what BNE is in order to change it, goodness this is a stumper. It gets confusing, dosn't it? -EDIT- Ok, i figured it out, all i had to do was change D0 to 80. (edited by mikepjr on 06-28-05 12:10 AM) |
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Glyph Phoenix Level: 39 Posts: 357/745 EXP: 385876 For next: 18895 Since: 11-07-04 Since last post: 2 hours Last activity: 2 hours |
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| I'd like to extend my knowledge of this so I can extend this tutorial, but 65c816 has annoyingly few resources. I need to know how Direct Page accessing works and the syntax of jmp and jsl statements. | |||
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Hackwiz Newcomer Level: 1 Posts: 1/1 EXP: 9 For next: 2 Since: 07-28-05 Since last post: 96 days Last activity: 54 days |
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| Hi Y'all, Something that has proven very useful for me in hacking Game Genie codes, is the W65C816S data sheet available from the manufacturer "Western Design." You can dl it in .pdf http://www.westerndesigncenter.com/wdc/ It has very good explainations for the different addressing modes/opcodes and other assorted goodies. For learning basic asm for the SNES/NES, I highly suggest: "Apple Machine Language" by Don Inman & Kurt Inman You can find it on amazon.com for a few dollars. Although it is based on the 6502 (NES) microprocessor, all of the opcodes are present in the 65C816 (SNES) micro opcode list. The book does a great job of teaching everything from hexidecimal to writing small routines.  (edited by Hackwiz on 07-28-05 12:07 PM) |
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Sukasa Boomboom Error 349857348734534: The system experienced an error. Level: 57 Posts: 1431/1981 EXP: 1446921 For next: 39007 Since: 02-06-05 From: *Shrug* Since last post: 6 days Last activity: 1 day |
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| JMP and JSL? The first tells the processor to move to a new section of code, instead of simply increment a byte. JML is the 24-bit equivalent of JMP, wheras JMP is only 16-bit. JSR and JSL are the same as their respective counterparts, but they also push the current program counter to the stack (again, 16-bit and 24-bit addresses respectively), before jumping to the desired offset. RTS and RTL are the same as the JMP and JML commands, but instead of getting the destination address from code, they get their destinations addresses from the stack. | |||
PaD Micro-Goomba Level: 5 Posts: 7/11 EXP: 361 For next: 168 Since: 07-27-05 From: Datteln, Germany Since last post: 86 days Last activity: 5 days |
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| Does anybody know a disassembler for 65816 (SNES) assembly (NOT running DOS-based)? I'd like to get into hacking myself, but reading opcodes is a pain in the ass and will result in total confusion. I need something readable... an assembler isn't necessary, I prefer writing assembly code directly in OpCode. (edited by PaD on 07-28-05 06:13 PM) |
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Sukasa Boomboom Error 349857348734534: The system experienced an error. Level: 57 Posts: 1455/1981 EXP: 1446921 For next: 39007 Since: 02-06-05 From: *Shrug* Since last post: 6 days Last activity: 1 day |
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| Well, I can't help you with a disassembler, but this may help: 65816REF.HLP. | |||
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Glyph Phoenix Level: 39 Posts: 408/745 EXP: 385876 For next: 18895 Since: 11-07-04 Since last post: 2 hours Last activity: 2 hours |
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| Thanks, DF, I'll add that into the tutorial when I get to those two... but I really need to know how to write a JMP or JML address. Are we talking byte flipping like with the ram addresses or anything like that? Or is this a Lunar Address thing? Not knowing how to change the regular address you use to find an offset from the kind you use in JMP or JML statements is really what's throwing me here. | |||
mikeyk Koopa Level: 18 Posts: 97/110 EXP: 25086 For next: 4811 Since: 07-17-04 Since last post: 45 days Last activity: 44 days |
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| GP: Lets say you have write some custom code at PC 0x0A9254 that you want to run. This address corresponds to SNES $159054, so to get to your code, all you have to do is get to it with a JML $159054 statement, 5C 54 90 15 in hex. The hardest part is finding a place to put your jump statement. I find it easiest to replace a JSL statement in the original code with your JML statement, and then just call the subroutine from your custom code. | |||
Dark Ludwig Red Paratroopa Level: 21  Posts: 53/172 EXP: 45740 For next: 4203 Since: 09-17-04 From: Georgia Since last post: 9 days Last activity: 2 days |
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| I figured out how the pointer of a branch instruction works. (excluding BRL) If it is going to branch, then it should work kinda like this below. Glyph, why don't you put this in the tutorial? If the branch's pointer byte was 00, it would branch to the byte immediately following that pointer. If it was 01, it would skip 1 byte after the pointer. If it was 05, it would skip 5 bytes. If it was 0C, it would skip C bytes, and so forth and so forth until you get to 7F, which is the farthest you can branch forward. Now, here is if you want to branch backward. If the pointer is FF, it will branch to itself, which is quite a dumb idea, unless a big crash is otherwise a good thing to your hack. If it's FE, it will branch backward one byte, which would of course also be dumb since that's the branch opcode. Then you just keep subtracting one at a time from the branch's pointer and move back one at a time from where it's branching, until you reach 80, which if the farthest it can branch backward. For a little demonstration, assume that the "O" is the branch's pointer byte, and that the vertical dashes are the bytes before and after the branch. Then, assume that the numbers above the dashes and "O" are above the byte that the branch would point to if it's pointer was that number. |---------------------------------------| |etc. FB FC FD FE FF 00 01 02 03 04 etc.| |--|--|--|--|--|--O--|--|--|--|--|--|--|| |---------------------------------------| Seriously, this thread is barely getting any attention. I had several questions, and I already figured out all but one on my own since it has been taking so long for an answer. How does a BRL work? Like, how do the two pointer bytes following it's opcode affect where it branches to? That's my only question as of now. Thank you so much for all the help you guys have given to all of us who want to learn this, I finally have a grasp on how to at least do simple custom ASM codes in SMW. Edit: Ok, I went ahead and erased all the answered questions, because this post was getting a bit jumbled. (edited by dark ludwig on 07-31-05 08:16 PM) (edited by dark ludwig on 08-01-05 02:37 AM) (edited by dark ludwig on 08-01-05 04:01 PM) (edited by dark ludwig on 08-02-05 12:20 AM) (edited by dark ludwig on 08-09-05 02:46 PM) (edited by dark ludwig on 08-09-05 02:47 PM) (edited by dark ludwig on 08-09-05 02:48 PM) |
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Tweaker Red Paragoomba Level: 12 Posts: 39/57 EXP: 6490 For next: 1431 Since: 03-20-05 From: Rochester, NY Since last post: 25 days Last activity: 13 days |
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| I really like this. It's a good SNES ASM tutorial in case I ever decide to major in SMW hacking (Or any SNES hacking for that matter).. I like how you explained the branching routines. I know a fair bit of Motorola 68000 ASM, and it works in the same way... Example: My_Routine: cmp.w #$0E10, FFE0 -- Check if the current word at RAM address FFE0 is 0E10 bne.s @Other_Routine -- If condition is false, branch to Other_Routine move.b #0B FE10 -- Move 0B to fE10 in RAM Other_Routine etc... But yeah, great work. From a ASM tutorial I saw for the SNES before, the instructions are fairly similar, with the exception of the SNES being a little endian processor based system. At least I'll be at a good start. =P |
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d4s Panser Level: 29  Posts: 273/325 EXP: 142151 For next: 5734 Since: 03-23-04 Since last post: 13 days Last activity: 1 day |
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| Glyph Phoenix: while some people still believe that coding in hex is easier and/or more l33t than using assemblers, its actually totally stupid and a waste of time. although you may be able to code some simple 2 or 3 opcode routine in hex, you'll very soon hit a dead end once your skill level increases and you start to work on more sophisticated stuff. trying to help out newbies is always a good idea, but you should make sure you have the appropriate knowledge base to do so, first. |
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Sukasa Boomboom Error 349857348734534: The system experienced an error. Level: 57 Posts: 1607/1981 EXP: 1446921 For next: 39007 Since: 02-06-05 From: *Shrug* Since last post: 6 days Last activity: 1 day |
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| d4s: Wrong. Coding in hex is easier for me, because when I attempted to use a compiler for a simle store 1/ store 0 block, the compiler assembled it with 16-bit accumulator settings in mind. While I agree that cometimes a compiler is useful, in many cases, I find that Hex editing SNES code can be easier and ultimately, more productive because it does not crash as often. | |||
Smallhacker Green Birdo SMW Hacking Moderator Level: 68  Posts: 1965/2273 EXP: 2647223 For next: 81577 Since: 03-15-04 From: Söderhamn, Sweden Since last post: 10 hours Last activity: 9 hours |
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| I'm coding ASM in hex, since I don't trust assemblers. Sure, it's messier to code and a hell to look for problems, but the code is like I want it to be, not like the assembler's programmer want it to be. |
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| Acmlm's Board - I2 Archive - Super Mario World hacking - Learning SMW ASM [ASM howto] |
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