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| Acmlm's Board - I3 Archive - SMW Hacking - SNES assemblery: I cannot read from or write to 7EC100, 7EC101 or 7EC800. Wha? |
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Glyphodon                 Since: 11-18-05 Last post: 6369 days Last view: 6349 days |
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| I first wrote something like A9 01 8D 00 C1 in my SMW hack. For those of you less hexadecimally inclined, that's:
LDA #$01 STA 7EC100 I even opened up Geiger's Debugger and put in a write breakpoint for 7EC100. Nothing. I put in an exec. breakpoint for where those two opcodes were, and they popped up quick so I know my code's being read -- it's just not being interpreted. I tried using 7EC101 and I was similarly screwed. I recalled that I had the same problem when I tried to access 7EC800, which is in the general 7ECxxx area, so I figured I might be having the same problem there. Am I trying to access RAM I can't, or what? I post it here in SMW hacking first because the problem is in my SMW hack. I don't know if that was such a great idea since this would seem to be a more general SNES processor problem. |
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Cirvania Cyball I guess this is as close as Xkeeper will get to spell it right. :<   Since: 11-17-05 From: The Island of Puerto Rico. Last post: 6330 days Last view: 6328 days |
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Hmm.. weird. I actually had the same problem once. I decided to leave that section of RAM alone. But have you tried [A9 01 8F 00 C1 7E]? I know the game reads the 7E bank as default, but it could still work...
Of course, this is coming from a guy with little ASM experience, so meh  |
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C:/xkas bio.asm Compiled ASM code  Since: 11-17-05 Last post: 6328 days Last view: 6327 days |
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| I think the problem is because you end up trying to write to ROM because you are using absolute adressing, example your 8D 00 C1 try to write to Snes 00:C100 wich is the ROM, use long adressing mode insted (edited by Bio on 05-30-06 09:39 PM) (edited by Bio on 05-30-06 09:42 PM) |
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Cirvania Cyball I guess this is as close as Xkeeper will get to spell it right. :< Since: 11-17-05 From: The Island of Puerto Rico. Last post: 6330 days Last view: 6328 days |
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| Um.. That's kinda what I told him, Bio.
Replace 8D(STA abs) with 8F(STA long). |
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C:/xkas bio.asm Compiled ASM code Since: 11-17-05 Last post: 6328 days Last view: 6327 days |
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| that because you posted while I was making my post |
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Glyphodon Since: 11-18-05 Last post: 6369 days Last view: 6349 days |
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| I'd rather not try that unless I were pretty sure that was the problem because I'd have to rewrite much of my reading code to match. It involves putting things in Y and Y only has an absolute mode, not a long one.
I don't think that that'd solve the problem anyway because where my code is now there used to be "A9 04 8D FC 1D". It STA'd 4 into 7E1DFC to make the spin jump sound without incident, which wouldn't be possible if it were writing to ROM, right? (edited by Glyph Phoenix on 05-30-06 10:05 PM) |
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C:/xkas bio.asm Compiled ASM code Since: 11-17-05 Last post: 6328 days Last view: 6327 days |
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please, learn about ROM bank:
Originally posted by BMF98567 See, SNES adress XX:0000 to XX:1FFF is 7E0000 to 7E1FFF in RAM, meaning that they are the only one you can acess with absolute adressing (edited by Bio on 05-30-06 10:14 PM) (edited by Bio on 05-30-06 10:17 PM) |
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HyperHacker Star Mario Finally being paid to code in VB! If only I still enjoyed that. <_< Wii #7182 6487 4198 1828 Since: 11-18-05 From: Canada, w00t! My computer's specs, if anyone gives a damn. STOP TRUNCATING THIS >8^( Last post: 6328 days Last view: 6328 days |
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Originally posted by Glyph Phoenix You basically answered your own question. Looking at this memory map, 00:8000-00:FFFF is ROM, and SMW usually has the data bank register (or whatever the hell it's called) at zero, so that certainly does appear to be the problem: You're writing to 00:C100, not 7E:C100. 00:0000-00:1FFF is mapped to 7E:0000-7E:1FFF, which is why the same code works with 7E1DFC. [edit] Posted at the same time as Bio. That's the second time someone's done that in this thread.  (edited by HyperMackerel on 05-30-06 10:15 PM) |
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Glyphodon Since: 11-18-05 Last post: 6369 days Last view: 6349 days |
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| Good to know. I'll just assume that long addressing would fix the problem and thank you guys now because I'm tired.
Edit: Yeah, that worked perfectly. Thanks all. (edited by Glyph Phoenix on 05-30-06 10:52 PM) (edited by Glyph Phoenix on 05-30-06 10:53 PM) (edited by Glyph Phoenix on 05-31-06 02:08 PM) |
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| Acmlm's Board - I3 Archive - SMW Hacking - SNES assemblery: I cannot read from or write to 7EC100, 7EC101 or 7EC800. Wha? |
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