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Forums > Requests > Onefile-demo with protection?!
2017-01-24 18:30
bugjam

Registered: Apr 2003
Posts: 1228
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?
 
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2017-01-24 19:21
Zyron

Registered: Jan 2002
Posts: 2035
Smurf :D
2017-01-24 20:34
Count Zero

Registered: Jan 2003
Posts: 769
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 07:54
bugjam

Registered: Apr 2003
Posts: 1228
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 08:06
j0x

Registered: Mar 2004
Posts: 207
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 14:01
Danzig

Registered: Jun 2002
Posts: 368
AFAIR this Fresh Intro had a "format-disk-protection", if one might call it so.
2017-01-25 18:29
ZeSmasher

Registered: Feb 2003
Posts: 204
we in Fresh protected our prgs so CFA could not recrack them, haha! :)
2017-01-25 21:36
TheRyk

Registered: Mar 2009
Posts: 392
Just write "THOU SHALT NOT STEAL" in memory at $0810 :D
2017-01-27 13:44
Danzig

Registered: Jun 2002
Posts: 368
Quote: we in Fresh protected our prgs so CFA could not recrack them, haha! :)

Fresh on Top
2017-01-30 03:55
Graham

Registered: Dec 2002
Posts: 990
Quote: 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 :)


Yeah, I had the same experience with the same tooldisk. It was Magic Disk 64, Sonderausgabe 3:

Magic Disk 64, Sonderausgabe 3 Cover

It wasn't the FC3 fastloader which "killed" the disk though. But if you had a load error, it would quick-format the disk because of the wrong end-addy in the zeropage.
2017-01-31 23:32
Count Zero

Registered: Jan 2003
Posts: 769
Thx for clearing that up, Graham!
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