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Flavioweb
Registered: Nov 2011
Posts: 463 |
"Professional disk mastering system" ?
There is a "professional system" that allows you to duplicate the contents of a floppy 5.25 regardless of the content or format?
Including copy of "alignment disks" as the b-side of the freespirit, or anything else possible or imaginable? |
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chatGPZ
Registered: Dec 2001
Posts: 11357 |
google "trace machine" ("trace" was the manufacturer, they made a popular commercial duplicator)
those can not really copy everything imagineable though (eg not certain types of justage disks) |
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Richard
Registered: Dec 2001
Posts: 621 |
I know what you mean. I bought about a couple of years ago, a C64 disk, which had some kind of protection which seems impossible to copy on to a 1541U2. (The track/sector signature protection). checks signature on t33 of side 2 |
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Flavioweb
Registered: Nov 2011
Posts: 463 |
Richard, accordingly with this thread
http://csdb.dk/forums/?roomid=7&topicid=105181#105207
seems that nibtools don't use "speed zones" at all... so this kind of protections still not dumpable...
Also if, theoretically, g64 specs support, even not in a perfect way, multiple speed zones. |
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chatGPZ
Registered: Dec 2001
Posts: 11357 |
there are really only *very few* titles that rely on this - and those found so far work in VICE (which does not support this either) just fine, so the problem with 1541u must be something else. |
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Flavioweb
Registered: Nov 2011
Posts: 463 |
How can these "few titles" works on emu, if the protected part isn't dumped as supposed?
Maybe other tools, like Kryoflux for eg, dumps the disks correctly, or there is "another way" to rappresent in a g64 image the "speed zone"? |
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chatGPZ
Registered: Dec 2001
Posts: 11357 |
on a real disk drive when you read a track that has more than one speedzone in it, you can only get valid data from the part that has been recorded in the speedzone that was selected in the respective registers in the drive ... however in the emulation, the emulated drive always delivers valid data.
the copy protection would usually only check if a certain sector is readable when a certain speed was selected - which works in emulation. if it did also check if a certain sector is NOT readable when another speedzone is selected, then it would fail in current emulation - but so far no such protection was found. |
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Flavioweb
Registered: Nov 2011
Posts: 463 |
I think this kind of protection could be developed nowdays, to check if a prg is executed on rh or emu...
Should be difficult that, in the past, someone could be imagine that a disc was something different from the hardware support... |
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chatGPZ
Registered: Dec 2001
Posts: 11357 |
sure.... if only anyone would still bother doing it =P |
