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Starfox
Registered: Jul 2014
Posts: 45 |
ROM areas that are 100% identical across all versions??
Hello
The other day I was wondering if there was any areas of any of the ROMs that are 100% identical across all known versions and revisions of those ROMs? For instance, the Japanese ROMs are probably changed a bit (Charset etc.)
Let's say you wanted to make some weird routine that reads the data of those ROMs and uses the values in some way, where they must be exactly the same each time else the program will crash.
I know this is a weird question 😊 |
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wacek
Registered: Nov 2007
Posts: 526 |
The idea of using ROM data is used for some sample compression in my productions done together with Mojzesh few years back, fe. "Let's Get Brute'al" 4k. |
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Starfox
Registered: Jul 2014
Posts: 45 |
Quote: The idea of using ROM data is used for some sample compression in my productions done together with Mojzesh few years back, fe. "Let's Get Brute'al" 4k.
Interesting 😎
I'll definetely check that demo 👍EDIT: just did, that's fuckin' insane! 🤯🤯🤯
I guess I could write a small prog to compare the roms. |
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chatGPZ
Registered: Dec 2001
Posts: 11500 |
Damn, you have already done it? Doing that has been on my todo list for a long time also :)
I wouldn't bother much to compare a lot of ROMs for this - C64 Demo platform has the stock kernal - and differences between the revisions are minimal (and well known) |
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Gordian
Registered: May 2022
Posts: 91 |
I used data from Basic area in Neverending RESTORE-y [64b] |
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wacek
Registered: Nov 2007
Posts: 526 |
Quoting chatGPZDamn, you have already done it? Doing that has been on my todo list for a long time also :)
Yeah, there is a whole writeup about it with the release.
We added a lot of "modifiers" to have even more variation based on the ROM data, for example EORing the sequence with a byte etc. It was fun :)
Also tested it for gfx data, but the results were much worse. |
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Starfox
Registered: Jul 2014
Posts: 45 |
Quoting chatGPZDamn, you have already done it? Doing that has been on my todo list for a long time also :)
I wouldn't bother much to compare a lot of ROMs for this - C64 Demo platform has the stock kernal - and differences between the revisions are minimal (and well known)
I see, thanks :)
Quoting GordianI used data from Basic area in https://csdb.dk/release/?id=250197[/quote]
Pretty cool! :) |
