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C64PP: Rapidlok [message #139802] Sat, 17 September 2005 01:57 Go to next message
Pete Rittwage is currently offline  Pete Rittwage
Messages: 444
Registered: March 2005
Karma: 0
Senior Member
I have some good news on the protection front...

I am starting to get Rapidlok-protected games imaged and booting in VICE
now! :)

They don't check for the bad GCR that exists at every sector as I
originally thought, but some games bump to halftracks at certain times
looking for a signature. The tracks are laid out synced together on an
original disk where a pattern of $7b bytes make up one "sector" of each
track. I believe it is bumping to the halftrack between them and
checking to see if it's in the same place on both tracks, and failing if
it isn't.

The biggest problem with these is the disks seem to go bad far more
often than others. I have about 10 of them and only a couple will boot
reliably from even the original disk on my systems. That makes it real
hard to get a good image.

-
Pete Rittwage
C64 Preservation Project
http://rittwage.com/c64pp
Re: C64PP: Rapidlok [message #139803 is a reply to message #139802] Sat, 17 September 2005 11:04 Go to previous messageGo to next message
James @ cbm264 is currently offline  James @ cbm264
Messages: 419
Registered: March 2012
Karma: 0
Senior Member
Pete,

Can you provide a list of what disks have Rapidlok on them? I have a
bunch here, I might be able to help you out.

James
www.cbm264.com
Re: C64PP: Rapidlok [message #139804 is a reply to message #139803] Sat, 17 September 2005 11:23 Go to previous message
Pete Rittwage is currently offline  Pete Rittwage
Messages: 444
Registered: March 2005
Karma: 0
Senior Member
James @ cbm264 wrote:
> Pete,
>
> Can you provide a list of what disks have Rapidlok on them? I have a
> bunch here, I might be able to help you out.
>
> James
> www.cbm264.com
>

Mostly all Accolade releases have it (80-90% of them). Also, many
Microprose-released games, such as Gunship, Silent Service, etc. use it.

Pete
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