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d0c
Registered: Apr 2006
Posts: 186 |
Activision Portal game need to be cracked!
portal from activision is still a uncracked games from 1986. as it is now it is only playable with an emulator, this is a shame because it is a mind blowing game that should be enjoyed on the real thing. and that by more than only the few people that own the original game. playing c64 games with winvice don't feel right...
so are anyone up for the challenge? who will be the first? now is your chance to prov your skills and make the introlinking worthy of your crack...
you find the uncracked game here in g64 format with the protection and all...
http://www.gamebase64.com/game.php?id=5836&d=18&h=0
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d0c
Registered: Apr 2006
Posts: 186 |
that zipcode thing is odd and rarely used, i didn't know of it before now... but cracked is best so there aren't any damn protection... :) |
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Fungus
Registered: Sep 2002
Posts: 680 |
zipcode was EXTREMELY common... geezuz. This is how multifilers were spread mostly.
A 1541 cannot, and never will be able to reproduce rapidlok, so just forget that idea.
Not only the key track, and track-to-track sync, but the size of the tail gap and the bytes in it. Rapidlok is not GCR encoded, it uses a custom encoding scheme which can be converted on the fly.
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Oswald
Registered: Apr 2002
Posts: 5086 |
Quote: zipcode was EXTREMELY common... geezuz. This is how multifilers were spread mostly.
A 1541 cannot, and never will be able to reproduce rapidlok, so just forget that idea.
Not only the key track, and track-to-track sync, but the size of the tail gap and the bytes in it. Rapidlok is not GCR encoded, it uses a custom encoding scheme which can be converted on the fly.
true for the bbs/importer scene, but not true for most of the other parts I guess, atleast I havent seen zipcode till like '96... |
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doynax
Account closed
Registered: Oct 2004
Posts: 212 |
Quote: zipcode was EXTREMELY common... geezuz. This is how multifilers were spread mostly.
A 1541 cannot, and never will be able to reproduce rapidlok, so just forget that idea.
Not only the key track, and track-to-track sync, but the size of the tail gap and the bytes in it. Rapidlok is not GCR encoded, it uses a custom encoding scheme which can be converted on the fly.
Out of curiosity.. What stops the 1541 from duplicating it exactly?
I mean if it where just the GCR/sector encoding you'd think it'd be possible just to copy the raw data stream without bothering to decode it.
Well, I guess it could do something nasty like changing the bit rates mid-track.. |
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tlr
Registered: Sep 2003
Posts: 1787 |
There are lots of tricks that can be done.
Here's an explanation of rapidlok.
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doynax
Account closed
Registered: Oct 2004
Posts: 212 |
Quote: There are lots of tricks that can be done.
Here's an explanation of rapidlok.
Interesting..
Inventing/cracking a copy protection scheme seems like a fun challenge, too bad I'm not writing a commercial game ;) |
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tlr
Registered: Sep 2003
Posts: 1787 |
You can do a protection challenge anyway, just for fun!
Try to protect some code, and see how long it takes for people to extract it... :)
There are a lot of games that are fairly easy to copy, but a bit harder to do a clean dump of due to obfuscation and/or encryption.
Take a look at Zeppelin for instance.
It implements a 16-bit virtual machine which runs a program implementing another interpreter.
In the disk version it is that code that does the actual protection check.
Note that, as usual there are holes in the mechanism enabling one to trap the code after the protection check.
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