Galahad 2018!
…Download the Crack source and PDF below

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scenex
scenex
6 years ago

Any insights on how the breakpoint detection mechanism works in this game?

Galahad
Reply to  scenex
5 years ago

I didn’t bother to look in all honesty, but detecting breakpoints in Action Replay is very easy.

whenever you use breakpoints in AR, it ALWAYS leaves code at address $40, developers obviously forgot to restore that address afterwards.

Simply clearing the byte at $40 when you takeover the system and then checking to see if anything gets put back in that address is all you need to do.

scenex
scenex
6 years ago

Very interesting read about the (in)famous RC3 dongle protection affair, thanks!

Mr.Q
Mr.Q
6 years ago

Thanks alot for your time and effort to do this.

sachy
sachy
6 years ago

Gr8 stuff, thanks!

Ed209
Ed209
6 years ago

Do you mean IPF 805, instead of IPF 803, Can only find 805 version of RC3, IPF 803 seems to be a game called Whizz. Still cant wait to read this 🙂

Galahad
Reply to  Ed209
6 years ago

Good spot, it is IPF 805. I’ve redone the PDF to include that detail and i’ve fixed part of the formatting 🙂 Will be live when Musashi gets around to it.

WayneK
6 years ago

Excellent, nice to see a tutorial from you – I had to laugh when you got fed up explaining the same thing repeatedly, this is a recurring problem writing Amiga cracking tutorials 🙂 Maybe a little appendix about how the files were encrypted would have been interesting (but as you pointed out, not required for the crack)?

Galahad
Reply to  WayneK
6 years ago

My main problem is that the repuation of the protection just didnt require the level of technical insight a tutorial would normally demand, it was just a really badly implemented protection, and just checking for two variables is enough to crack it, so I handled this one differently in that I provided the necessary information to crack it, without me having to do a 100 page opus on something I just dont rate AT ALL.

Jurassic Park was better protected than this and that used Copylock and PDOS ffs!!

ABG
ABG
6 years ago

Well done ! Thank you for the explanations.

Galahad
6 years ago

Will resubmit another PDF later, its hasnt processed properly with some pictures missing or in the wrong order….sigh

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