Zak McKracken. Played it with friends together; it took us probably 2 month each day after school to finally sovle. Felt like an incredible achievement. Was also the first game I ever bought as an original; quite af hefty price for a student back then, but well worth the money. Centurion: Dender of …

Thanks so much K1n9_Duk3! Currently I'm super busy, but I'll look into this later. This is really helpful. I've seen messing around with Int3 and Int1 to make debugging harder in several games (DosBox debugger doesn't care about software interrupts though), but I was thinking Int21 w/ AH = 25h and …

Unfortunately the CGA version is more difficult. It uses a custom packer; the main game content/logic seems to be in FILECODE.SQZ; and LOADER.EXE unpacks the actual EXE in memory. Since packers are quite difficult -- at least for me :-) -- I gave up on this. md5 for FILECODE.SQZ is …

After messing around with Knight Force (i.e. debugging the copy protection) I _think_ the protection can be removed by simply going to File Offset C11A hex and patching the byte there from 50 hex to CB hex. Found this thread after googling afterwards. The result is that the protection function …