![]() However, I didn’t know what debugging was in the first place, so that’s a bummer. So technically, I could have done remote debugging back then. There is an interesting article about doing that with DosBox, but it’s very slow.įun Fact 2: Back in the days, most folks could probably only dream about remote debugging … like owning two PCs? How rich do you have to be? … but back then my father was so annoyed that I was always using his 386, that I got my own computer (a used 286). execute the program on one PC (graphically, as it would normally run) and the use a null-modem connection and run Turbo Debugger on another machine. You can of course do remote debugging, i.e. Now during this whole process I have to say that looking back, USE MODERN TOOLS.įun Fact: With Turbo Debugger you can of course not easily break in between a graphical program, so this makes things difficult. You can either go the classic route via Turbo Debugger or … even (?), or simply use the DosBox debugger. As mentioned, can be done by either UPC or UNP.ĭebug the unpacked INSTALL.EXE. Or I didn’t actually crack the game but there is some nifty hidden catch, like a boss-fight deep in the game where you can’t win anymore… but at least right now it seems as if you break the disk check during installation, you’re done. So maybe there were some additional run-time checks back then. And we were young but not stupid back then. Now this all doesn’t make any sense at all as a copy protection mechanism, because you can simply installed Jurassic Park once, and then zip (or arj or rar) the game directory manually and give it to someone else. I confirmed this by copying a successful installation from Dosbox to a FreeDos VirtualBox instance, and the game would still boot up. So the step where I stumbled upon last time – disk check during installation – seems to be the actually copy protection mechanism, and after managing the installation, we should be done. copy protection: „can only be installed from original disks“. But looking at this review from the German magazine PC Player, the review says w.r.t. In my memories, you had to have Disk#1 in the drive to start up the game. ![]() Next thing is the copy protection mechanism itself. This one works as well, and seems to be the gold-standard of DOS unpacking. In the meantime I’ve also found UNP, a universal DOS unpacker that supports dozens of formats. I’ve also written that I was able to unpack the INSTALL.EXE binary with Universal Program Cracker. I’ve already written in a previous blog post on how I unsuccessfully attempted to crack the copy protection mechanism, namely Rob Northen’s ProPack (sometimes abbreviated RNC). So this is how to remove the copy protection from Jurassic Park (DOS) from Ocean Software. Another issue I have is, that I simply can’t let things go.
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