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Atari 8-bit Software Preservation Initiative


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#626 walter_J64bit ONLINE  

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Posted Thu May 18, 2017 7:02 PM

I'll just keep my PC running.



#627 Farb OFFLINE  

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Posted Thu May 18, 2017 9:05 PM

It seems I had a network misconfiguration that was not allowing peers to connect. I think it's fixed now so we'll see if things start working for folks.



#628 _The Doctor__ OFFLINE  

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Posted Thu May 18, 2017 9:06 PM

okay... what's the IP   I perma banned people who sat a zero for more that 48 hours

 

still got nothing coming

 

I will manually add the peer ip and port   I leach at 330MiB down and feed at 25 MiB up


Edited by _The Doctor__, Thu May 18, 2017 9:12 PM.


#629 AtariGeezer OFFLINE  

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Posted Thu May 18, 2017 9:23 PM

Looks okay to me,  there are files that are bigger than 3 MB and conversational German at 271 MB which leaves 184 MB for all the rest which are less than 1 MB and most of those are less than 100k...



#630 _The Doctor__ OFFLINE  

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Posted Thu May 18, 2017 9:39 PM

cool, the numbers are good but the torrent is still stalled correct?



#631 Farb OFFLINE  

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Posted Thu May 18, 2017 9:42 PM

Ok, I was trying to be clever and set up a torrent server so there was always a seed. That seems to have failed miserably, so here's a torrent file created the same way I've done the previous ones...

Attached Files



#632 AtariGeezer OFFLINE  

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Posted Thu May 18, 2017 9:43 PM

Yep,  no peers are currently downloading ...

 

New torrent downloaded 100% and now seeding...


Edited by AtariGeezer, Thu May 18, 2017 9:54 PM.


#633 Clay Cowgill OFFLINE  

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Posted Thu May 18, 2017 10:38 PM

I'm at 100% now, I cranked up my upstream limit and will leave it seeding for overnight and some time tomorrow.  Thanks for all the work on thie Farb!



#634 _The Doctor__ OFFLINE  

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Posted Thu May 18, 2017 10:40 PM

it is rolling along but rather slowly.... only 300 KiB/s   I sure hope everyone delete all parts and files of the failed torrents as the name and folders may resend whatever was part of the old torrent

 

2 seeds found

 

I am currently uploading 3x more than I am getting...


Edited by _The Doctor__, Thu May 18, 2017 10:41 PM.


#635 Clay Cowgill OFFLINE  

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Posted Thu May 18, 2017 10:45 PM

I turned my upstream throttling off entirely, but it's not going above ~500kB/s. Probably Comcast choking off torrent traffic or something... 



#636 Kyle22 OFFLINE  

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Posted Thu May 18, 2017 10:57 PM

480K here, also Comcast.



#637 Clay Cowgill OFFLINE  

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Posted Thu May 18, 2017 11:51 PM

480K here, also Comcast.

Very suspicious... ;-)



#638 _The Doctor__ OFFLINE  

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Posted Fri May 19, 2017 12:01 AM

I was able to feed someone at 1MiB I could feed 25 more at that rate....



#639 xdslx OFFLINE  

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Posted Fri May 19, 2017 2:52 AM

two peers except me  , both are stuck at %70.7 . one is from us other uk. 



#640 xdslx OFFLINE  

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Posted Fri May 19, 2017 2:54 AM

its so small , can somebody upload it to mega instead of torrent ?



#641 Mclaneinc OFFLINE  

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Posted Fri May 19, 2017 3:42 AM

The new torrent was full speed for me and now seeding...

 

Thanks Farb etc...



#642 remowilliams OFFLINE  

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Posted Fri May 19, 2017 8:05 AM

its so small , can somebody upload it to mega instead of torrent ?

 

EDIT:  link updated

 

https://mega.nz/#F!U...W4_zbYBWyHElfvw

 



#643 sargie OFFLINE  

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Posted Fri May 19, 2017 8:35 AM

Not having much luck with the torrent - Stuck at 70 odd percent now for 12 hours :(



#644 remowilliams OFFLINE  

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Posted Fri May 19, 2017 8:38 AM

Not having much luck with the torrent - Stuck at 70 odd percent now for 12 hours :(

 

Use the new torrent file from this post  http://atariage.com/...26#entry3764564

 

It is active and seeded.



#645 Triads OFFLINE  

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Posted Fri May 19, 2017 8:38 AM

Not having much luck with the torrent - Stuck at 70 odd percent now for 12 hours :(


Im seeding the previous torrent now

#646 sargie OFFLINE  

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Posted Fri May 19, 2017 9:05 AM

Thanks! Is working now - almost done! 

 

Will leave it seeding until the next one!



#647 xdslx OFFLINE  

xdslx

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Posted Fri May 19, 2017 11:49 AM

thank you very much , theperhim gary kach



#648 ijor OFFLINE  

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Posted Sun May 21, 2017 2:32 PM

Here is a clean working dump of Zeppelin. As the name of the file implies, this title works only on an 810 drive. It will randomly fail on a 1050 and probably on everything else as well. So if using Altirra, make sure the drive is configured as 810. Will elaborate later ...

 

I wanted to make a detailed article about this because it is quite interesting. But never found the time. So I am posting here the main concept "as headlines" without much of a redaction. Technically oriented people will probably understand, I hope :)

 

- Zeppelin uses the so called skew align as one of its protections.

- Skew align refers to a specific angular alignment of the sectors across different tracks.

- Most titles with this protection were formatted aligned with the index hole.

- So that the same physical sector number is located at almost the same angular position in all the tracks.

- The typical protection check performs something like reading physical sector one of a track, then sector one of an adjacent track, and measures the total time taken. It should be one full revolution.

- Some protections measure the actual RPM before, others assume a nominal value.

- The specific drive and firmware timings, such as seek time and settle delay, are not relevant. It always takes one full revolution because the revolution time is much bigger.

- The total time since the drive starts reading the first sector until being ready to read the other one in the adjacent track is in the order of 150 ms; while a full revolution takes 208 ms.

- So the drive always needs to wait one full revolution disregarding if it was ready 20 ms earlier or later.

 

- Zeppelin disks are is not aligned to the index hole. The skew align was achieved likely using timing.

- That means that sectors with the same physical number in different tracks are not at the same angular position.

- It also makes the formatted alignment not that accurate because it is more influenced by the drive RPM.

- The angular distance between specific sectors on adjacent tracks is not constant. This is probably on purpose to make reproduction of the alignment more difficult.

- But note that yet the alignment across multiple copies is, of course, (more or less) constant for a given pair of tracks.

- Protection is checked similarly as the typical case, measuring the elapsed time since reading physical sector one of a random track, until reading also physical sector one on an adjacent track.

- But because of the not constant alignment, it doesn’t always take one revolution. The software has a table for the expected time for each track.

- And because now in some tracks it takes less time than one revolution, the internal drive timings become relevant and significant.

- The protection assumes the timing matches a standard 810 drive. Just about any other drive would randomly fail the protection.



#649 Farb OFFLINE  

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Posted Mon May 22, 2017 2:11 PM

This is fantastic information - thanks, Ijor. I've updated the information for the Zeppelin dump on the preservation website with this info.



#650 DjayBee OFFLINE  

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Posted Mon May 22, 2017 4:13 PM

 

- But because of the not constant alignment, it doesn’t always take one revolution. The software has a table for the expected time for each track.

 

Slight correction: It's actually two tables to diffenrentiate between PAL and NTSC.






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