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Forums > CSDb Discussions > Create G64 disk image using real hw: possible?
2013-10-02 07:58
Flavioweb

Registered: Nov 2011
Posts: 413
Create G64 disk image using real hw: possible?

There is a way to create a G64 image using only real hardware?
 
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2020-11-08 23:50
Zibri

Registered: May 2020
Posts: 136
Quoting Groepaz
Burstnibbler uses parallel connection to begin with, which is pretty much a requirement for a proper nibbler

I don't agree.
It was true at the time and only for speed reasons.
2020-11-09 14:02
Groepaz

Registered: Dec 2001
Posts: 9649
You can agree or not, you still need it (or expanded memory in the drive) to read a full revolution raw and reliably.
2020-11-09 14:41
tlr

Registered: Sep 2003
Posts: 1422
If only they'd put 8K+ in there from the beginning... :P

Come to think of it, I still have a +8K board waiting to be installed. :)
2020-11-09 15:40
Krill

Registered: Apr 2002
Posts: 1640
Quoting tlr
If only they'd put 8K+ in there from the beginning... :P

Come to think of it, I still have a +8K board waiting to be installed. :)
Hah, and i still have a parallel cable upgrade kit sitting around... =)
2020-11-10 08:44
Comos

Registered: May 2004
Posts: 53
Quote: Quoting Groepaz
Burstnibbler uses parallel connection to begin with, which is pretty much a requirement for a proper nibbler

I don't agree.
It was true at the time and only for speed reasons.


How did you come to that conclusion?
2020-11-11 21:37
Fungus

Registered: Sep 2002
Posts: 469
Nibblers are not duplicators, so lets just set that straight right now. Zoom Floppy is incapable of making any of kind of proper disk image for protected software.

I'll wait for the big brain to claim he can read weak bits perfectly with 1541 and then make popcorn.
2020-11-11 23:18
Groepaz

Registered: Dec 2001
Posts: 9649
Once you can read a full revolution reliably without parallel cable or memory expansion, you can also read woke bits.
2020-11-15 23:32
Zibri

Registered: May 2020
Posts: 136
Quoting Groepaz
You can agree or not, you still need it (or expanded memory in the drive) to read a full revolution raw and reliably.

Why?
You can read parts of a track and then stitch them together as the data repeats. Also with weak bit a single rotaion won't show you everything. For sure it's faster with a parallel cable or a memory expansion, I am just saying that technically it's only the speed of the operation that changes.
2020-11-15 23:33
Zibri

Registered: May 2020
Posts: 136
Quoting Groepaz
Once you can read a full revolution reliably without parallel cable or memory expansion, you can also read woke bits.

If I understood it correctly, a real weak bit is a bit that is magnetized lightly and has an unstable state so that sometimes it reads as a 0 and sometimes as a 1.
A single revolution will only read it in one way. Or I got the concept wrong?
2020-11-16 00:16
Groepaz

Registered: Dec 2001
Posts: 9649
Quote:
You can read parts of a track and then stitch them together as the data repeats.

you cant do this reliably on arbitrary data. it only works if you have reliable syncpoints on the track.
Quote:
If I understood it correctly, a real weak bit is a bit that is magnetized lightly and has an unstable state so that sometimes it reads as a 0 and sometimes as a 1.
A single revolution will only read it in one way. Or I got the concept wrong?

this is one type of weak bit, another type is created by using invalid GCR sequences (too many consecutive zeros).
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