'New nibtools release and Happy Holidays!'
Author:Pete Rittwage (registered user: 558 posts )
Date: Sun, Nov 27th, 2011 @ 16:27 ( . )

Well, it's that time of year again and the Christmas demos are up on the c64preservation site. :)

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I've released a new version of nibtools today- not a huge release, but a requested feature for the tinkerers. You can now change the extra capacity margin settings with the -m switch during writing.

In older versions, it was automatically a more aggressive setting of 5, but newer versions were 10. The size of the track is measured several times internally and the largest difference is added to this number.

Just -m by itself will have no safety zone at all other than the maximum measured capacity difference, which will surely result in some tracks overwriting the start of their own track data. So, use this only for tinkering with certain protection tracks. Putting a number after '-m' adds bytes to the safety zone.

Not using '-m' at all still produces the old behavior of measured+5 bytes.

Background: We are writing track data that is essentially a circle and "destroys it's start" if you write too much data, so we have to be careful not to write too far. These drive mechs are old, and most are belt driven, so there is a needed safe zone of 5-10 bytes, typically. Non-belt driven drives (1571, and some 1541-II) are more exact and may work fine with no safe zone.


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'New nibtools release and Happy Holidays!'
Author:hyper active (registered user: 296 posts )
Date: Tue, Nov 29th, 2011 @ 21:18 ( . )

I hope that soon, Na.... er... I mean Santa claws leaves a little something in our Christmas stockings too. Hint Hint.


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'New nibtools release and Happy Holidays!'
Author:hyper active (registered user: 296 posts )
Date: Tue, Nov 29th, 2011 @ 22:16 ( . )

talking of all things speed wise, Just a little tip which might help make your disk dumps more reliable. Some protections seem to come out better when the drive speed is set as close to 300 rpm as possible. I've noticed that after an hour or so of use, the motor on my 1541 seems to spin slightly faster. For example if I use the rpm1541 program that comes with open cbm as soon as I turn my drive on, it might say the disk is spinning at 299.85 rpm, but a couple of hours later if I try it again, it says the disk is spinning at 300.21rpm.
I've no idea if this is a common issue with all drives though, just make sure the speed doesn't go above or below 300rpm for best results.


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'New nibtools release and Happy Holidays!'
Author:Lord Crass (guest: search)
Date: Thu, Dec 01st, 2011 @ 23:15 ( . )

I highly doubt that +/- 0.2RPM is going to affect any remastering efforts. That's like +/- 5 bytes per track difference.

Consider yourself lucky if your drive only deviates that much from an exact 300RPM. Mine is on the order of +/- 3RPM fluctuation on a good day.


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'New nibtools release and Happy Holidays!'
Author:Pete Rittwage (registered user: 558 posts )
Date: Fri, Dec 02nd, 2011 @ 09:12 ( . )

Agreed, but it is tweak-able now. :)


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