Article View: comp.sys.mac
Article #37123Re: Breaking Mediagenics' copy protection
From: Alexis Rosen
Date: Thu, 02 Feb 1989 07:38
Date: Thu, 02 Feb 1989 07:38
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I can't tell you how to defeat the copy protection on Shanghai (I'm sure it's not too difficult, though, I've seen deprotected versions). I can tell you how to defeat that horribly annoying shutdown at the end. Look in all of the CODE resources for a sequence of bytes like this: 3F3C 000x A895 where the x is either 1 or 2. This pushes a word onto the stack and calls the Shutdown trap. Replace this with: A9F4 4E71 4E71 which is an ExitToShell and two No-ops. Note: I have not tried this (I don't have shanghai). Since you need to do this on an original, make DAMN SURE you know what you're doing and can reverse the change if I've screwed up somewhere. Caveat Emptor. Alexis Rosen alexis@ccnysci.uucp
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!iuvax!rutgers!cmcl2!ccnysci!alexis From: alexis@ccnysci.UUCP (Alexis Rosen) Newsgroups: comp.sys.mac Subject: Re: Breaking Mediagenics' copy protection Keywords: copy protection, mediagenics, copy II mac Message-ID: <1215@ccnysci.UUCP> Date: 2 Feb 89 07:38:58 GMT References: <1226@xn.LL.MIT.EDU> <81044@felix.UUCP> Reply-To: alexis@ccnysci.UUCP (Alexis Rosen) Organization: City College of New York Lines: 20