Carrier Command: fuel opcodes..?

Thrash911 · 18 May 2007, 12:21

Hello Amiga People,

I'm using an A500 with kick 1.3 and an Action Replay III module. I love finding the memory addresses for lives, energy, etc. in games, and NOP out the opcodes. I feel very creative when I do that..

But I have a problem with Carrier Command, and the fuel gauges. For example, the fuel for the Manta 1 (aircraft 1), is located at 490 and 491 (in my version of the game) with a maximum value of respectively 7F and FF - that is when the tank is full. But I can NOT find anything that messes with those addresses. I tried finding it with the FA command on addresses 48E, 48F, 490 an 491 - it finds nothing. I have also tried to insert breakpoints on the same addresses, but they do not trigger, even if I alter the amount of fuel manually in the game. The values change on those addresses when I do that, so why doesn't it trigger the breakpoints?

And why the h*ll are there no opcodes??

Please help me understand what I do wrong..

-Brian

musashi5150 · 18 May 2007, 12:24

When you said using "breakpoints" on the address - you meant "memory watchpoints" didn't you?

If you set a watchpoint on the fuel address it should trigger near the instruction that changes it.

Thrash911 · 18 May 2007, 12:37

Damn.. Yes, it triggers with the watchpoints! My bad. So.. When it freezes due to the watchpoint, and I use D command (disassemble), it starts at the exact point where execution stopped, right?

musashi5150 · 18 May 2007, 13:44

No.. it's not exact. It may be a few instructions after. But it's pretty near.

Makes the machine run shit slow too while it's turned on

Thrash911 · 27 May 2007, 19:02

Can someone with a brilliant mind help me find the address(es) to NOP out, or otherwise change? How can I find it, when the FA command gives me nothing at all?

-Brian

BippyM · 27 May 2007, 22:07

there is probably a sub command subtracting the fuel..

us the f command to search for sub (opcode is probably $0479)

Code:

f 04 79

and then see if any returned results are subtracting from $490

Thrash911 · 27 May 2007, 22:21

Thank you for helping.

Oh, those values can represent assembler commands? That's neat. But that's a no go. It returns no results at all.. So.. What can be done now?

BippyM · 27 May 2007, 22:44

i'll have a look, my offsets sem diff tho, and i can't be bothered searching soooooo what's your config for winuae?

Thrash911 · 27 May 2007, 22:59

Hmm.. I was using a regular A500.

But I have fired up WinUAE now. I have the complete TOSEC collection (including original disks), so maybe u can tell me what version you are using, and I can quickly find the correct address. I think..

BippyM · 27 May 2007, 23:07

pick one.. i have complete tosec and some..

Thrash911 · 27 May 2007, 23:14

Oki.

Carrier Command (1988)(Rainbird)[cr Defjam - CCS]

On this version Manta 1 fuel is at 4AE and 4AF. When game starts they should be 7F and FF (max).

BippyM · 27 May 2007, 23:16

you could search for the address $04 $ae

fa 04ae

Thrash911 · 27 May 2007, 23:26

Hmm.. In WinUAE, it gives this:

044780 CMP.L 000004AE.S,D7

But on my regular Amiga, it gives me nothing (when done on 0490, of course).. Why? hmm..

Well, what is CMP? Compare?

BippyM · 27 May 2007, 23:27

it's comparing the contents at that address with whatever value is in d7

what are the next few commands, one will be a branch

Thrash911 · 27 May 2007, 23:34

Ok:

044784 LINEA
044786 CMP.B D6,D6
044788 LINEA
04478A LINEA
04478C LINEA
04478E BCLR D2,-425F(A0)
044792 LINEA

A lot of LINEA's, whatever that is..

BippyM · 27 May 2007, 23:36

that looks like crap data

Thrash911 · 27 May 2007, 23:39

Do you have something different? But it all seems weird, because if it finds something with FA here, it should also find something with the other version of the game, right? I mean It's the same code in memory, just a little different offset? Or am I not thinking right?

BippyM · 27 May 2007, 23:57

how do i play this bloody game?

I need to move

Thrash911 · 27 May 2007, 23:58

Just make the little plane fly? Or do u want to move the whole carrier?

BippyM · 27 May 2007, 23:59

i dunno how to do anything..

18 May 2007, 12:21	#1
Thrash911 Registered User Join Date: May 2007 Location: Denmark Age: 48 Posts: 29	Carrier Command: fuel opcodes..? Hello Amiga People, I'm using an A500 with kick 1.3 and an Action Replay III module. I love finding the memory addresses for lives, energy, etc. in games, and NOP out the opcodes. I feel very creative when I do that.. But I have a problem with Carrier Command, and the fuel gauges. For example, the fuel for the Manta 1 (aircraft 1), is located at 490 and 491 (in my version of the game) with a maximum value of respectively 7F and FF - that is when the tank is full. But I can NOT find anything that messes with those addresses. I tried finding it with the FA command on addresses 48E, 48F, 490 an 491 - it finds nothing. I have also tried to insert breakpoints on the same addresses, but they do not trigger, even if I alter the amount of fuel manually in the game. The values change on those addresses when I do that, so why doesn't it trigger the breakpoints? And why the hll are there no opcodes?? Please help me understand what I do wrong.. -Brian Last edited by Thrash911; 18 May 2007 at 12:21. Reason: just minor error, edited 1 minute after posting..*

27 May 2007, 22:07	#6
BippyM Global Moderator Join Date: Nov 2001 Location: Derby, UK Age: 48 Posts: 9,355	there is probably a sub command subtracting the fuel.. us the f command to search for sub (opcode is probably $0479) Code: f 04 79 and then see if any returned results are subtracting from $490

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18 May 2007, 12:24	#2
musashi5150 move.w #$4489,$dff07e Join Date: Sep 2005 Location: Norfolk, UK Age: 42 Posts: 2,351	When you said using "breakpoints" on the address - you meant "memory watchpoints" didn't you? If you set a watchpoint on the fuel address it should trigger near the instruction that changes it.

18 May 2007, 12:37	#3
Thrash911 Registered User Join Date: May 2007 Location: Denmark Age: 48 Posts: 29	Damn.. Yes, it triggers with the watchpoints! My bad. So.. When it freezes due to the watchpoint, and I use D command (disassemble), it starts at the exact point where execution stopped, right?

18 May 2007, 13:44	#4
musashi5150 move.w #$4489,$dff07e Join Date: Sep 2005 Location: Norfolk, UK Age: 42 Posts: 2,351	No.. it's not exact. It may be a few instructions after. But it's pretty near. Makes the machine run shit slow too while it's turned on

27 May 2007, 19:02	#5
Thrash911 Registered User Join Date: May 2007 Location: Denmark Age: 48 Posts: 29	Can someone with a brilliant mind help me find the address(es) to NOP out, or otherwise change? How can I find it, when the FA command gives me nothing at all? -Brian

27 May 2007, 22:21	#7
Thrash911 Registered User Join Date: May 2007 Location: Denmark Age: 48 Posts: 29	Thank you for helping. Oh, those values can represent assembler commands? That's neat. But that's a no go. It returns no results at all.. So.. What can be done now?

27 May 2007, 22:44	#8
BippyM Global Moderator Join Date: Nov 2001 Location: Derby, UK Age: 48 Posts: 9,355	i'll have a look, my offsets sem diff tho, and i can't be bothered searching soooooo what's your config for winuae?

27 May 2007, 22:59	#9
Thrash911 Registered User Join Date: May 2007 Location: Denmark Age: 48 Posts: 29	Hmm.. I was using a regular A500. But I have fired up WinUAE now. I have the complete TOSEC collection (including original disks), so maybe u can tell me what version you are using, and I can quickly find the correct address. I think..

27 May 2007, 23:07	#10
BippyM Global Moderator Join Date: Nov 2001 Location: Derby, UK Age: 48 Posts: 9,355	pick one.. i have complete tosec and some..

27 May 2007, 23:14	#11
Thrash911 Registered User Join Date: May 2007 Location: Denmark Age: 48 Posts: 29	Oki. Carrier Command (1988)(Rainbird)[cr Defjam - CCS] On this version Manta 1 fuel is at 4AE and 4AF. When game starts they should be 7F and FF (max).

27 May 2007, 23:16	#12
BippyM Global Moderator Join Date: Nov 2001 Location: Derby, UK Age: 48 Posts: 9,355	you could search for the address $04 $ae fa 04ae

27 May 2007, 23:26	#13
Thrash911 Registered User Join Date: May 2007 Location: Denmark Age: 48 Posts: 29	Hmm.. In WinUAE, it gives this: 044780 CMP.L 000004AE.S,D7 But on my regular Amiga, it gives me nothing (when done on 0490, of course).. Why? hmm.. Well, what is CMP? Compare?

27 May 2007, 23:27	#14
BippyM Global Moderator Join Date: Nov 2001 Location: Derby, UK Age: 48 Posts: 9,355	it's comparing the contents at that address with whatever value is in d7 what are the next few commands, one will be a branch

27 May 2007, 23:34	#15
Thrash911 Registered User Join Date: May 2007 Location: Denmark Age: 48 Posts: 29	Ok: 044784 LINEA 044786 CMP.B D6,D6 044788 LINEA 04478A LINEA 04478C LINEA 04478E BCLR D2,-425F(A0) 044792 LINEA A lot of LINEA's, whatever that is..

27 May 2007, 23:36	#16
BippyM Global Moderator Join Date: Nov 2001 Location: Derby, UK Age: 48 Posts: 9,355	that looks like crap data

27 May 2007, 23:39	#17
Thrash911 Registered User Join Date: May 2007 Location: Denmark Age: 48 Posts: 29	Do you have something different? But it all seems weird, because if it finds something with FA here, it should also find something with the other version of the game, right? I mean It's the same code in memory, just a little different offset? Or am I not thinking right?

27 May 2007, 23:57	#18
BippyM Global Moderator Join Date: Nov 2001 Location: Derby, UK Age: 48 Posts: 9,355	how do i play this bloody game? I need to move

27 May 2007, 23:58	#19
Thrash911 Registered User Join Date: May 2007 Location: Denmark Age: 48 Posts: 29	Just make the little plane fly? Or do u want to move the whole carrier?

27 May 2007, 23:59	#20
BippyM Global Moderator Join Date: Nov 2001 Location: Derby, UK Age: 48 Posts: 9,355	i dunno how to do anything..

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