Sorry, Dungeon Master again :)

Supamax · 17 March 2009, 01:37

I read somewhere on the board that DM's protection (and Chaos Strikes Back's too) is based on weak bits.

I was wondering... is there a SPS game with weak bits protection on the same track as DM (Track 0 Side 1) ?

EDIT: I admit I don't have a clue about how it is possible to make a protection which causes a different read any time

musashi5150 · 17 March 2009, 09:03

Quote:

Originally Posted by Supamax

EDIT: I admit I don't have a clue about how it is possible to make a protection which causes a different read any time

You can think of it kinda like unformatted tracks. Each time the track is read the controller returns some random values which are different when the track is read repeatedly. When the game does its disk check if all reads produce the same data then it knows that it's a copy

Supamax · 17 March 2009, 16:16

Quote:

Originally Posted by musashi5150

You can think of it kinda like unformatted tracks. Each time the track is read the controller returns some random values which are different when the track is read repeatedly. When the game does its disk check if all reads produce the same data then it knows that it's a copy

Hi,
I thought it could be something like that; however, DM will recognize the difference between an unformatted track and a track with weak bits.
Can we tell that a track with weak bits is something like a partially unformatted track? I suppose it's much more difficult than this

.

musashi5150 · 17 March 2009, 16:29

Quote:

Originally Posted by musashi5150

You can think of it kinda like unformatted tracks.

Spot the key word

Although this is mostly for the ST maybe this can explain it better for you http://dmweb.free.fr/?q=node/210

Supamax · 17 March 2009, 16:38

Quote:

Originally Posted by musashi5150

http://dmweb.free.fr/?q=node/210

WOW, great link!

Supamax · 17 March 2009, 16:54

I seem to remember, though, that other games with weak bits were correctly dumped by SPS (but I could be wrong).
If so, why DM's weak bits are so "special"? Why isn't it possible (yet) to correctly get a SPS image of it?

dlfrsilver · 18 March 2009, 00:24

it's ATARI ST weak bits ! Not amiga ones

that's why !

Supamax · 18 March 2009, 00:26

Quote:

Originally Posted by dlfrsilver

it's ATARI ST weak bits ! Not amiga ones

that's why !

What do you mean exactly?

dlfrsilver · 18 March 2009, 02:45

the protected track is an atari ST one, with weak bits.

Remember, the amiga is able to read ST, PC, mac disk format

prowler · 18 March 2009, 02:58

Quote:

Originally Posted by dlfrsilver

Remember, the amiga is able to read ST, PC, mac disk format

Hi Denis,

Could you please elaborate on this?

Thanks,

prowler

dlfrsilver · 19 March 2009, 03:52

simple : The protection track on the amiga version of dungeon master is an atari ST track.
Pure and simple. And this one use Weak bits

The amiga has abilities to read non amiga formats. you must tell it how to read those
tracks. The amiga has even hardware facilities to read GCR macintosh disks (as stated in
the amiga disk drive book).

17 March 2009, 01:37	#1
Supamax Da Digger :) Join Date: Nov 2008 Location: Monza, Italy Posts: 2,822	Sorry, Dungeon Master again :) I read somewhere on the board that DM's protection (and Chaos Strikes Back's too) is based on weak bits. I was wondering... is there a SPS game with weak bits protection on the same track as DM (Track 0 Side 1) ? EDIT: I admit I don't have a clue about how it is possible to make a protection which causes a different read any time Last edited by Supamax; 17 March 2009 at 01:59.

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17 March 2009, 16:54	#6
Supamax Da Digger :) Join Date: Nov 2008 Location: Monza, Italy Posts: 2,822	I seem to remember, though, that other games with weak bits were correctly dumped by SPS (but I could be wrong). If so, why DM's weak bits are so "special"? Why isn't it possible (yet) to correctly get a SPS image of it?

18 March 2009, 00:24	#7
dlfrsilver CaptainM68K-SPS France Join Date: Dec 2004 Location: Melun nearby Paris/France Age: 46 Posts: 10,413	it's ATARI ST weak bits ! Not amiga ones that's why !

18 March 2009, 02:45	#9
dlfrsilver CaptainM68K-SPS France Join Date: Dec 2004 Location: Melun nearby Paris/France Age: 46 Posts: 10,413	the protected track is an atari ST one, with weak bits. Remember, the amiga is able to read ST, PC, mac disk format

19 March 2009, 03:52	#11
dlfrsilver CaptainM68K-SPS France Join Date: Dec 2004 Location: Melun nearby Paris/France Age: 46 Posts: 10,413	simple : The protection track on the amiga version of dungeon master is an atari ST track. Pure and simple. And this one use Weak bits The amiga has abilities to read non amiga formats. you must tell it how to read those tracks. The amiga has even hardware facilities to read GCR macintosh disks (as stated in the amiga disk drive book).

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