BAWarp disk imager - Page 20

Supamax · 26 January 2009, 05:32

Dumping with "alewarp filename -e" (polled).
As I wrote to you privately, the DMA mode exits with error.

Started at 03:50.

EDIT: Now (05:51) it's on track 55

.
This means 3 hours for 80 tracks!!
The floppy drive is hot...
I hope you'll find an algorythm which is half-way between rawread's (faster but not as accurate as your current release) and your actual

.
I really need an A1200... but will not buy it!

EDIT#2: I had to stop it (need to sleep).
I uploaded to The Zone the raw DMA dump and the partial POLLED .adf dump (56 tracks). Hope it helps

Supamax · 26 January 2009, 15:56

I made further and deeper tests.
PM sent

BlueAchenar · 26 January 2009, 21:36

Quote:

Originally Posted by Supamax

I made further and deeper tests.
PM sent

Thanks mate!

The algorithm you used is still rawread's by the way

I have a new idea for an algorithm. Will start implementing it right now.

Edit: It's looking very good. By the way, I found the Amiga's DMA bug in your dma_new.raw. It happens in the same position every time.

Supamax · 26 January 2009, 22:44

Quote:

Originally Posted by BlueAchenar

Thanks mate!

The algorithm you used is still rawread's by the way

Impossible... rawread never took more than 10 minutes on my A600.
Your latest polled release has a different algorythm, or you probably increased much more the amount of reads. Am I right?

I tried your latest release (with success) in another way. I PMed you

BlueAchenar · 26 January 2009, 22:54

Quote:

Originally Posted by Supamax

Impossible... rawread never took more than 10 minutes on my A600.
Your latest polled release has a different algorythm, or you probably increased much more the amount of reads. Am I right?

I tried your latest release (with success) in another way. I PMed you

Oh, I'm analysing your DMA data and it's really great. All reads are more than 90% similar.

I just have things like this to solve:

Code:

Cyl 6, side 0
Offset: 12656 (of 12660 bytes + 4 bits)
010101010010100110100101001001001010010100101010
010101010010010010100101001001001010010100101010
010101000100010010100101001001001010010100101010

000000010000000100000001000000010000000100000001

Tell me, of the three reads (the first 3 bit sequences), which one is the correct one? This is a shame only a 9 bit sequence completely dissimilar in three 12600 byte reads and it can ruin error correction.

I think I'll switch to bit by bit based correction in these rare cases.

Supamax · 26 January 2009, 23:09

Quote:

Originally Posted by BlueAchenar

Tell me, of the three reads (the first 3 bit sequences), which one is the correct one?

Ehm, have you a preferred disk/sector analysis utility (under Amiga)?
I don't know just now how to check x cylinder etc.

Isn't it useful to analyse the ReloKick 1.4a .adf from which I obtained the floppy, which I then dumped?

BlueAchenar · 29 January 2009, 00:24

Quote:

Originally Posted by Supamax

Ehm, have you a preferred disk/sector analysis utility (under Amiga)?
I don't know just now how to check x cylinder etc.

Isn't it useful to analyse the ReloKick 1.4a .adf from which I obtained the floppy, which I then dumped?

Yes, it's very useful.

A little status update:

I've successfuly reconstructed an 98%+ accurate ADF image from the data SupaMax sent me (by cross-referencing data from 5 reads of each track) and got to the conclusion that the drive actually read the data wrong more times than right and that's why the image is riddled with errors. My algorithm was based on finding similarities in the several reads to merge them. Even tracks in which all reads are equal except a few bits (~99.98% equal), which were merged the track presents errors when checked with X-Copy.
I may have to try a different approach like Toni's OR algorithm, to find bits that shifted or weren't detected by the drive's heads.

Unfortunately, I can only resume this work next week, as I have pressing issues to attend to in "real life".

Supamax · 29 January 2009, 00:40

No problem, mate!

BlueAchenar · 08 February 2009, 00:31

I'm almost back.

And I've got the USB floppy reader almost ready to be programmed. Looks like the error correction algorithms will be also for Linux/Windows.

Supamax · 08 February 2009, 00:32

He's (almost) back! He's back!

Won't you forget the poor owners of A500/A600?

BlueAchenar · 08 February 2009, 00:41

I'm gonna show you what I've been doing (attached).

It's a internet traffic compression/encryption application. It also obfuscates what you're doing if you're navigating through a http proxy.

My company puts a 50MB cap on our monthly traffic. Part of the many reasons no one that knows it applies to work there (it has got a really bad rep in regards to working conditions).

So I'm finishing this to have some peace of mind. I'll be back to the floppies afterwards.

Supamax · 08 February 2009, 00:58

Whoa, I don't think I fully understand what you are doing, but... keep up the good work

.

AmigaFriend · 08 February 2009, 11:07

Quote:

Originally Posted by BlueAchenar

My company puts a 50MB cap on our monthly traffic.

With that cap, even only downloading business emails you're out of juice in 4 days!

prowler · 08 February 2009, 11:25

Quote:

Originally Posted by BlueAchenar

My company puts a 50MB cap on our monthly traffic.

Quote:

Originally Posted by xpect

With that cap, even only downloading business emails you're out of juice in 4 days!

Yes indeed. Haven't they considered that this might just be detrimental to their business?

Supamax · 08 February 2009, 16:29

Oh, I understand now...

He implemented traffic compression/encryption in order to be able to transfer more data (compressed).

BlueAchenar · 10 February 2009, 13:21

Quote:

Originally Posted by Supamax

Oh, I understand now...

He implemented traffic compression/encryption in order to be able to transfer more data (compressed).

Exactly!

And I've great (commercial) plans for this one.

About alewarp. I'll be reviewing the algorithms, I'm not sure if your A500/600 will be powerful enough to run the better ones, but whatever the outcome you'll always be able to use a PC.

Supamax · 10 February 2009, 16:00

Quote:

Originally Posted by BlueAchenar

About alewarp. I'll be reviewing the algorithms, I'm not sure if your A500/600 will be powerful enough to run the better ones, but whatever the outcome you'll always be able to use a PC.

Do you mean "use a PC with WinUAE"?
But I will not be able to dump real Amiga floppies, which I thought was the meaning of Alewarp...

BlueAchenar · 10 February 2009, 16:01

Quote:

Originally Posted by Supamax

Do you mean "use a PC with WinUAE"?
But I will not be able to dump real Amiga floppies, which I thought was the meaning of Alewarp...

I mean, dump RAW images with alewarp and do error correction on a PC.

Supamax · 10 February 2009, 16:20

Quote:

Originally Posted by BlueAchenar

I mean, dump RAW images with alewarp and do error correction on a PC.

Ohhhhh, then I'm *very* glad I misunderstood

.
Great!

BlueAchenar · 11 March 2009, 13:18

Just stopped by to say 'Hi'.

I'm going through many changes in my life, that's why I've been a little idle on Amiga issues. :P

26 January 2009, 05:32	#381
Supamax Da Digger :) Join Date: Nov 2008 Location: Monza, Italy Posts: 2,822	Dumping with "alewarp filename -e" (polled). As I wrote to you privately, the DMA mode exits with error. Started at 03:50. EDIT: Now (05:51) it's on track 55 . This means 3 hours for 80 tracks!! The floppy drive is hot... I hope you'll find an algorythm which is half-way between rawread's (faster but not as accurate as your current release) and your actual . I really need an A1200... but will not buy it! EDIT#2: I had to stop it (need to sleep). I uploaded to The Zone the raw DMA dump and the partial POLLED .adf dump (56 tracks). Hope it helps Last edited by Supamax; 26 January 2009 at 06:18.

08 February 2009, 00:32	#390
Supamax Da Digger :) Join Date: Nov 2008 Location: Monza, Italy Posts: 2,822	He's (almost) back! He's back! Won't you forget the poor owners of A500/A600? Last edited by Supamax; 08 February 2009 at 00:49.

08 February 2009, 00:41	#391
BlueAchenar Not dead yet!!! :D Join Date: Feb 2008 Location: Aveiro / Portugal Age: 42 Posts: 690	I'm gonna show you what I've been doing (attached). It's a internet traffic compression/encryption application. It also obfuscates what you're doing if you're navigating through a http proxy. My company puts a 50MB cap on our monthly traffic. Part of the many reasons no one that knows it applies to work there (it has got a really bad rep in regards to working conditions). So I'm finishing this to have some peace of mind. I'll be back to the floppies afterwards. Attached Thumbnails

11 March 2009, 13:18	#400
BlueAchenar Not dead yet!!! :D Join Date: Feb 2008 Location: Aveiro / Portugal Age: 42 Posts: 690	Just stopped by to say 'Hi'. I'm going through many changes in my life, that's why I've been a little idle on Amiga issues. :P Last edited by BlueAchenar; 12 March 2009 at 01:35.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Vectrex collection with 3D Imager, light-pen and complete set of games	Tolls	Retrogaming General Discussion	5	24 April 2011 13:45
Disk-2-Disk by Central Coast Software (full or demo version)	mark_k	request.Apps	3	09 July 2006 14:10
How can a floppy be a PC 720k disk and an Amiga 880k disk at the same time?	dreamkatcha	New to Emulation or Amiga scene	33	24 July 2004 14:25
Newbie question: how to access files on an Amiga disk using PC disk drive?	Nethead	New to Emulation or Amiga scene	5	04 July 2003 23:07
G Soft Audio Imager	Syko	support.Hardware	0	13 November 2002 18:48

26 January 2009, 15:56	#382
Supamax Da Digger :) Join Date: Nov 2008 Location: Monza, Italy Posts: 2,822	I made further and deeper tests. PM sent

29 January 2009, 00:40	#388
Supamax Da Digger :) Join Date: Nov 2008 Location: Monza, Italy Posts: 2,822	No problem, mate!

08 February 2009, 00:31	#389
BlueAchenar Not dead yet!!! :D Join Date: Feb 2008 Location: Aveiro / Portugal Age: 42 Posts: 690	I'm almost back. And I've got the USB floppy reader almost ready to be programmed. Looks like the error correction algorithms will be also for Linux/Windows.

08 February 2009, 00:58	#392
Supamax Da Digger :) Join Date: Nov 2008 Location: Monza, Italy Posts: 2,822	Whoa, I don't think I fully understand what you are doing, but... keep up the good work .

08 February 2009, 16:29	#395
Supamax Da Digger :) Join Date: Nov 2008 Location: Monza, Italy Posts: 2,822	Oh, I understand now... He implemented traffic compression/encryption in order to be able to transfer more data (compressed).

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)