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Main - SMW Hacking - ASM to Hex New thread | New reply


boingboingsplat
Posted on 09-08-07 07:10 PM Link | Quote | ID: 65026


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I've just started learning ASM and I've coded a block that when touched will set the On/Off Flag to Off if one Dragon Coin has been collected. How do I convert it to hex for use with Block Tool?

Here is the code if it helps:
PHA
LDA $1422
CMP #$01
BEQ OnOffFlag
LDA #$01
STA $14AF
OnOffFlag:
PLA
RTS

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GreyMaria
Posted on 09-08-07 07:31 PM (rev. 2 of 09-08-07 07:35 PM) Link | Quote | ID: 65027

>implying even the Japanese understand the Japanese
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65816ref.hlp


That's all you'll need to convert 65816 ASM to hex and back.

No, I don't know where it is.

And don't you want BNE or BPL $#00 (Branch if Plus [Higher than 00]) instead of BEQ? As your current code stands, it would always set the switch to OFF unless you had exactly one dragon coin.

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blackhole89
Posted on 09-08-07 09:42 PM (rev. 2 of 09-08-07 09:42 PM) Link | Quote | ID: 65031


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I uploaded it for good measure.

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boingboingsplat
Posted on 09-08-07 10:05 PM Link | Quote | ID: 65032


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So I have to convert it by hand? I was hoping there'd be an easier way. But how do I convert labels to hex? Also, thanks for the tip about BEQ Grey Mario.

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Skreeny
Posted on 09-08-07 10:31 PM Link | Quote | ID: 65037


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Last view: 4844 days 		For BEQs, if I understand properly, you have to calculate how far it'd have to jump and put that in the instruction.

If you don't want to do that, it looks like they have some stuff in the Utilities section of Romhacking.net.

boingboingsplat
Posted on 09-08-07 10:49 PM Link | Quote | ID: 65038


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One of those is Xkas, which I already have. How can I use it to convert ASM to Hex?

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cory21391
Posted on 09-09-07 06:51 PM Link | Quote | ID: 65080


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Last view: 5130 days 		some assemblers output binary files (like TRASM). Addressing labels are affected when inserted into smw though...

ex.)
jsl label1
lda #$45
sta $2100
rtl
label1:
rtl

if compiled into a bin file, that would be:

0000: 22 0A 80 00 A9 45 8D 00 21 6B 6B

the code would jump to: 00 80 0A; which is more than likely NOT where your code is inserted into SMW.... you're best bet is to just bra and not jump (unless you add code in manually and know where you're going and stuff )

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smkdan
Posted on 09-10-07 11:14 AM (rev. 2 of 09-10-07 11:16 AM) Link | Quote | ID: 65145


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Last view: 4014 days 		in.asm contains: 

PHA
LDA $1422
CMP #$01
BEQ OnOffFlag
LDA #$01
STA $14AF
OnOffFlag:
PLA
RTS


Then to assemble, first parameter is source, second is output or ROM to patch. 

xkas in.asm out.bin


out.bin contains:

48 AD 22 14 C9 01 F0 05 A9 01 8D AF 14 68 60

The ASM file is pretty bare but it's all you need there.

Ailure
Posted on 09-10-07 11:57 AM Link | Quote | ID: 65147

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I'm having a rising urge to rename this thread to "ASM to Machine code". Since that would be the proper term...

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boingboingsplat
Posted on 09-10-07 01:44 PM Link | Quote | ID: 65150


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Well yeah, I've made the block and then I realized it would be more effecient as a generator. So I made it into one. At least I learned how to do this.

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