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DOSBox Static Addresses

Posted: Thu Jun 21, 2018 10:33 pm
by erfg12


DOSBox 0.74-2 32bit's vmem base pointer is 0x01D1ABFC

DOSBox 0.74 32bit's vmem base pointer is 0x01D3A1A0

DOSBox 0.73 32bit's vmem base pointer is 0x01D3FD40

DOSBox r4132 32bit's vmem base pointer is 0x01F7942C



Add Address Manually > [X] Pointer > (type in) 0x01D3A1A0 > (press) OK.



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You should see in the Address column "P->(ADDRESS)". That is your temporary vmem base address.



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Use cheat engine and find some values. This will give you a temporary address for the value.



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Open Windows 10 calculator in Programmer mode and press Hex. Or, find a hex calculator website.



Put in your temporary address for the value you found and minus the vmem base address. This will be your offset.



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DOSBox Static Addresses

Posted: Fri Jun 22, 2018 7:56 am
by SunBeam
Do specify that on a different DOSBox version this will not work as indicated (as the static pointer to the allocation will be different).

DOSBox Static Addresses

Posted: Sat Jun 23, 2018 8:13 pm
by erfg12
Both in the title and the post I stated this is for version 0.74. Would they assume it works for other versions?

DOSBox Static Addresses

Posted: Sat Jun 23, 2018 9:30 pm
by SunBeam
Trust me, people do this shit. They overlook the version and post "it doesn't work for my DOSBox"; then when you ask them which version, you can tell why :D

DOSBox Static Addresses

Posted: Sun Jun 24, 2018 2:36 pm
by jonasbeckman
DOSBox hasn't been updated in a while now but they still do regular daily builds. (Since 2012 I think when the last current release was made.)

This looks like it could be useful though, although I myself update the binaries on a weekly basis. (6+ years of multiple daily builds means a lot of accumulated fixes and improvements and one day perhaps they'll have a new official release up, maybe.)



EDIT: Just have to check and yep these are still called 0.74.0 it seems.

DOSBox Static Addresses

Posted: Tue Jun 26, 2018 2:44 pm
by gir489
I miss the old days of PEEK and POKE cheats on the C64. Static memory made things so much easier. Nice work detailing how to work with DOSBox, though. I've always wondered how they try to handle static memory on a dynamic memory platform.

DOSBox Static Addresses

Posted: Thu Jul 05, 2018 9:04 pm
by erfg12
I noticed some GOG games use DOSBox 0.73 so here is the base pointer for that: 0x01D3fD40



Update 7/24/2018: Added r4132 base pointer: 0x01F7942C



I'll be releasing a video in a few days to show how you can find the base pointer for any version of dosbox easily.

DOSBox Static Addresses

Posted: Thu Jul 26, 2018 4:36 pm
by erfg12
I added a video to help locate the base address of DosBox on every version.

DOSBox Static Addresses

Posted: Sun Aug 05, 2018 6:08 am
by koderkrazy
Do you have similar stuff(or anything) on PS3 and Wii emulators?

Re: DOSBox Static Addresses

Posted: Fri Aug 31, 2018 10:59 am
by SunBeam
I have something similar for CEMU; but in general: the application executable will store pointers to emulator page allocations. It's all a matter of determining the start of the allocation to then just mem-search for a pointer to it ;)

Re: DOSBox Static Addresses

Posted: Wed Oct 31, 2018 6:14 pm
by ohvince
Thanks for your very useful tutorial @erfg12!

I dont know if you have already tried it with DosBox 0.74-2 (release from August 30th, 2018)

I've found the DosBox 0.74-2 base pointer address at: 0x01D1ABFC
But I have some strange things...
1/ Using CE to find data addresses (like score, lifes etc...) addresses are BEFORE than the DosBox 0.74-2 address
IE: at the base pointer address 0x01D1ABFC -> value is 0ADB9020 but the address for a data like the game score is at 09DDFA10 so the offset is 0ADB9020 - FD9610
2/ But if I launch the DosBox emulator, for the same game, the offset still negative but different!

I dont know if I'm doing something wrong or if there is something special with this version...


Thanks,
vince

Re: DOSBox Static Addresses

Posted: Sun Dec 09, 2018 9:01 am
by Dread_Pony_Roberts
If anyone wants to know, the static address for the DOSBox Daum SVN build (http://ykhwong.x-y.net/) is

0x27944CC

Re: DOSBox Static Addresses

Posted: Sun Jan 06, 2019 8:50 pm
by erfg12
There is another solution. If you compile DOSBox yourself, there will be a .PDB file that generates a different virtual memory base address that makes it easier to find between versions. Here's a little video about it.


Re: DOSBox Static Addresses

Posted: Wed Feb 27, 2019 8:11 am
by Eric
To make things 'easier', just add the base pointer
Then when adding entries make them children of the base pointer and use address notations like

Code: Select all

+xxxx
it will end up with the address of the pointer+xxxx

Re: DOSBox Static Addresses

Posted: Sun Apr 07, 2019 10:34 am
by daninthemix
Anyone have the base address for DosBox 0.74.2.1?

(used in Rayman Forever, amongst others)

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