Sega Mega CD ISO Hacks & Editors

[Tony H]

ok thanks though i will tell ya how it works

I was reading my post and just wanted to clarify something: When I said to "do this to every occurrence of 66xx and 67xx, no matter what number the "xx" is", I mean every occurrence after a "0C39007F00FF0F20".

[nighthawk]

ok thanks though i will tell ya how it works

[nighthawk]

because i reather do it on a sega cd machien plus the sega cd i try the par sometimes it works sometimes it dont exept the wii gens plus but i reathere do the sega that is why i bought it and also i bought a sega 32x and a mega everdrive as well dont want to wast the money eh

[Tony H]

Before I start, let me say that I haven't tested this at all, so use this info at your own risk. I'm just going by the raw assembly that I see in the iso file.

Open up your Sonic CD iso file with any hex editor (I use Hex Workshop).

Search for every occurrence of: 0C39007F00FF0F20

If there is a 66xx right after that, then change the 66xx to 4E71. If there is a 67xx right after it, then change the 67xx to 60xx.

Examples: if you see 0C39007F00FF0F20 6610, then you would change it to 0C39007F00FF0F20 4E71. (I put the space right after the FF0F20 to make it easier to read.)

If you see 0C39007F00FF0F20 671E, then change it to 0C39007F00FF0F20 601E.

Just remember to do this to every occurrence of 66xx and 67xx, no matter what number the "xx" is.

There will be lots of matches you'll have to change. Make sure you save the changes when you exit the hex editor.

That's it.

One question... why don't you use an emulator and just enter a single PAR code? That would save you a LOT of time messing around with the hex editor. I think there are a few good emulators that support "FF" type RAM/PAR codes with Sega CD.

[nighthawk]

well i did a little bit of it in sega 32x but the iso i couldnt figer out yet but if you can i will try work isnt the problem dont mind if i can figer out how to do it most of the stuff is not to hard till i got to figering out the iso ones hex just click on goto in the pulldown to the offset is the way i did sega 32x but as for iso it didnt work

[Tony H]

nighthawk, do you know how to use a hex editor? If so, I can throw together a quick post on how to get the desired affect (have all 7 stones/Good futures). There will be some work involved on your part (several offsets to change in the iso file).

[nighthawk]

any one have any luck yet at this code getting it in the sonic cd iso
Have All 7 Time Stones/Good Futures
FF0F20:7F00

it comes from this page
http://gamehacking.org/?game=85279
thanks

[jadekitten]

Courtesy Of Rimsky82

Snatcher (USA) Sega CD
----------------------
Infinite Health
Offset:7411B12 6002
Offset:7411AEA 6004

[Tony H]

I'm working on other codes right now, so check with Rimsky82 and see if he can help with your request. If not, let me know and I'll take a look at it in the near future.

[jadekitten]

well so far i can only make it work in MESS, but MESS' sega cd emulation is kind of crummy, so ii wanted to hex it in, but i don't know what to search for

[Tony H]

If the PAR code modifies a RAM address, then you can't use it to directly edit the iso file. You can use the RAM address to help you figure out how to modify the iso, but it takes some work.

[jadekitten]

hey tony rimsky82 made a par code for snatcher, can you help me hex edit my iso?

[Tony H]

one more quition how do you find thease hex acorses because i used gens plus hacked version to find the pars it dont have hex locations

I think you're asking how I found the addresses in the ISO file? With Sonic CD it's much easier than most other games because you can use the other Sonic games for Genesis to help you figure out what ISO addresses to change. Sonic CD uses the same assembly language as Genesis.

[nighthawk]

one more quition how do you find thease hex acorses because i used gens plus hacked version to find the pars it dont have hex locations

[nighthawk]

well will take a look i do have a hex editor workshop i did figer out how to use it with ps3 game saves but iso i have never figered out see the par codes work on the wii but i just bought a sega cd and got all the patches from https://sites.google.com/site/segamegacdpatches/ to work on it and burned it and it worked on the sega cd
so when you get time i would love the one code i will let you know if i get it to work on the iso of the ones you told me about thanks