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11-02-05 12:59 PM
1 user currently in Rom Hacking: hukka | 2 guests
Acmlm's Board - I2 Archive - Rom Hacking - Excuse me if this has been asked already but.. | |
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kuja killer

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Since: 09-22-05
From: Lake Havasu City, Arizona

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Posted on 10-07-05 11:14 PM Link | Quote
Are there any in-depth tutorials for using the 6502 debugger with FCEUXD ? ...I can't find any exactly...i've found only just 1 link to some website...but it was broken.

...just trying to ask for a little reference if that's not too much to ask for....


(edited by kuja killer on 10-07-05 02:15 PM)
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(edited by kuja killer on 10-07-05 04:35 PM)
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(edited by kuja killer on 10-08-05 10:35 AM)
NetSplit

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Posted on 10-08-05 07:18 AM Link | Quote
The three FCEUd tutorials on DESnet's documents page might help you out. Good luck.
AP

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Posted on 10-08-05 07:33 AM Link | Quote
There are also two more FCEUd tutorials here and here. (FCEUXD is similar to FCEUd, so you shouldn't have any problems when following these tutorials with FCEUXD.)


(edited by AP on 10-07-05 10:35 PM)
kuja killer

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Posted on 10-08-05 09:45 AM Link | Quote
Omg, thanks...i feel so embarrassed that I wasn't able to find any documents myself earlier today. Sorry.

EDIT: okay so i've been reading them and wanted to try out the infinite lives thing from http://www.geocities.com/bjb138/rockmanXasm/asm1.html ..since it talks about doing it on super mario brothers...i wanted to try it out on Megaman 4 and I'm getting the hang of it now. ...but i'm just curious to find out exactly to REALLY make sure if i've been doing it right cause some odd things have happened in the process...

So on megaman 4 ...the number of lives you start off with is 2 (just like in super mario bros) ...i open the cheat search ...click reset...enter "02" in known value box and click known value...comes to 19 possibilities ....i go die...hit it again and comes down to like 6 possibilities or something.. one of them that caught my attention was "$00A1" ..i think that's the one that controls the number of lives cause i set it to the cheat list...go die and my lives never go down. ...

Now the complicated part which I'm hoping i'm understanding correctly. ..
I find it in the debugger by setting a a write breakpoint to 00A1 ..die...it snaps at the following:
$C833:C6 A1 DEC $A1 = #$02
and a 2 lines below it ...
$C835:A9 00 LDA #$00
$C837:85 9A STA $9A = #$00

It said on the site that if i wanted the lives to never go down ..i would change the C6 part to "AD" in the hex editor ..within these few values:
C6 A1 A9 85 9A .....am i right ? ....so i did it to test it out...reset the game ..play...die...and lives never go down ..

BUT ...sometimes the game will actually just crash...sometimes it won't....that's what I don't understand.. ..umm ?? ...
And about setting the default number of lives to whatever I want...well i couldn't find any "02" around the area in the hex editor.. 0x07C843 and the guide said how I should NOT touch the address which in this case would be the "00" and "A1" ... ...or is it safe to do so ? ..like changing either one of those to say ... 05 for example...am i getting my facts straight here ? .
I change the value number with the cheat search to any number i want on 00A1 ...like i put 04...update..i have 4 lives...6...6 lives..but when i go look at the lines in the debugger..i don't see any information changed at all except for the "=#$04 or whatever part ...so i don't get exactly what numbers changed it to make it so 04 ..im a little confused.



(edited by kuja killer on 10-08-05 03:16 AM)
(edited by kuja killer on 10-08-05 03:36 AM)
(edited by kuja killer on 10-08-05 03:51 AM)
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