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Re: Copy protection removal software for DOS games

Posted on 2019-09-21, 17:47

in DOS
Yeah that was also a big problem, multiple versions, 5.25, 3.5 and cd-rom, not to mention regional differences. US version of the game, ahh too bad, thats what bit action replay/game shark too. The above games however had multiple checks put in deliberately by the programmers. So they'd crack only …

Re: Copy protection removal software for DOS games

Posted on 2019-09-18, 10:26

in DOS
Before Rawcopy, Locksmith and Nevlock I used DAP and Crock. Good times. Some of them contain real bad cracks, you start playing and half-way get hit by a nice dos-prompt, or you fall through floors, that happened to me while playing flashback. Wizardry 7 helps you with zero damage in melee battles, …

Re: Blues Brother character select *VERY* slow

Posted on 2019-09-18, 10:16

There is now past self :D A nice patch for running in DOSBOX tested at 3000 cycles: filename: VGA.EXE sha256sum: 3d1d585e58f8e1f79b49ad3228b9179cde93e25612ce9b31d64f98bb01ec74ea original < 00ccc0 08 74 fb eb 0c 90[a0 c6 77 8a 26 c6 77 3a c4 74 < 00ccd0 f8]5d 07 1f 5e 5f 5a 59 5b 58 cb 50 53 51 52 57 …

Re: Some confusion over versions of Starflight

Posted on 2019-08-21, 10:09

in DOS
create a dosbox.conf file in the game directory: Copy code to clipboard 1 [dosbox] 2 machine=tandy 3 memsize=31 4 5 [cpu] 6 core=dynamic 7 cycles=5000 8 cycleup=500 9 cycledown=500 10 11 [mixer] 12 nosound=false 13 rate=44100 14 blocksize=2048 15 prebuffer=10 16 17 [sblaster] 18 type=none 19 20 [ …

Re: Windows 2000 installation loop

Posted on 2019-08-16, 17:36

derSammler wrote: Make sure it does not boot from CD over and over again. 😉 Yeah that can bite you sometimes, was it xp that came with the press any key to boot from cd ? cant really remember. whatever he's installing from, he needs to disconnect it after the first reboot iirc.

Re: Writing a patch in ASM

Posted on 2019-08-10, 12:02

Hmm...its kinda working, but with a couple of issues. 1. It only works on my machine in dosbox, because its patching absolute, not relative ? 2. Its not stable, if I exit the game, the OS becomes unstable, it hangs second time around ? 3. I understand 80% of what I pieced together ? If anyone can …

Re: Writing a patch in ASM

Posted on 2019-08-08, 18:47

A generic approach for in-memory patching is, if you tell DOS to load-but-do-not-execute the file , it is in memory and you get the segment address of the program's PSP; from there you can write to whatever locations you want within the program code. Of course, it's a good idea to test your planned …

Re: Writing a patch in ASM

Posted on 2019-08-08, 09:02

That is extremely helpful, thank you sir. What I got so far writing my first ASM program, is a simple 'Hello world'. 1. I need to figure out how to patch in-memory 2. When to patch, the executable needs to decompress itself first, otherwise whats the point. 3. I would probably have to wait for the …

Re: Writing a patch in ASM

Posted on 2019-08-08, 07:25

You provide little information on what you're trying to do (or why a copy of the EXE won't do), but I'm inferring that you'd like to patch the game in-memory and then run it? If so, a good start might be DOS function 4Bh/AL=1 (load but do not execute). My bad, I wasn't too clear about what I wanted …

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