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Forums > Requests > Onefile-demo with protection?!
2017-01-24 17:30
bugjam

Registered: Apr 2003
Posts: 2466
Onefile-demo with protection?!

Hi all,

here is a tricky one. A friend of mine tried to analyze a one-file-demo back in the late 80s, because he was impressed with the effects; it could have been a crack intro as well.
Unfortunately the only thing he remembers is that the program formatted the disk, after he had changed something in the code (he tried to run it block-wise, to see what each part was doing), so apparently it had some sort of very nifty protection against nosy rippers. :-)
Anyone ever encountered something like this?
2017-01-24 17:59
Angel of Death

Registered: Apr 2008
Posts: 210
Can't recall a demo or intro with a disk-formatter.
I remember the old German Cracking Service didn't start the game if it found anything wrong.
And TMC's trained version of Wizball which screwed up the disk if tampered with was quite notorious in the day.
2017-01-24 18:18
tlr

Registered: Sep 2003
Posts: 1698
There were several protector-programs that put a checksum on the a program and formatted the disc if it failed.
Those were more 85-86ish though. Presumably made for the purpose of hampering a rampant surge of recracks.
2017-01-24 18:19
Zyron

Registered: Jan 2002
Posts: 2381
There were protectors causing that kind of behaviour, Checksum Protector V1.0 f ex. I remember getting a disk wiped by it because the file, loaded from tape, got a load error. Very annoying.
2017-01-24 18:21
Zyron

Registered: Jan 2002
Posts: 2381
Smurf :D
2017-01-24 19:34
Count Zero

Registered: Jan 2003
Posts: 1809
I remember I had a version of Charset Mixer V1.0 on one of my disks and someday it killed that tool disk. Apparently since I loaded the program with a different speeder than usual. (FC3 vs AR5 or smthg)
Never really cared to investigate. Maybe someone else cares to check :)
2017-01-25 06:54
bugjam

Registered: Apr 2003
Posts: 2466
Ah, so this was actually quite common - thanks a lot for the info, I had never heard of that protection mechanism before. Cheers!
2017-01-25 07:06
j0x

Registered: Mar 2004
Posts: 215
I got a demo disk from Noise in the late eighties. Ran the first demo, pressed run/stop-restore in the last part, which caused the demo to do a format. I never got to see the rest of the demos on that disk...
2017-01-25 13:01
Danzig

Registered: Jun 2002
Posts: 428
AFAIR this Fresh Intro had a "format-disk-protection", if one might call it so.
2017-01-25 17:29
Smasher

Registered: Feb 2003
Posts: 510
we in Fresh protected our prgs so CFA could not recrack them, haha! :)
2017-01-25 20:36
TheRyk

Registered: Mar 2009
Posts: 2030
Just write "THOU SHALT NOT STEAL" in memory at $0810 :D
 
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