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Search took 0.12 seconds. Search: Posts Made By: Keir
Forum: project.SPS (was CAPS) 05 October 2023, 07:49
Replies: 939
Views: 197,855
Posted By Keir
That all sounds great. Thanks as usual for all...

That all sounds great. Thanks as usual for all the work on it!
Forum: project.SPS (was CAPS) 03 October 2023, 23:38
Replies: 939
Views: 197,855
Posted By Keir
Great! Will the sega decoder change go into...

Great! Will the sega decoder change go into disk-utilities in due course?

Maybe all the sega decoders should be renamed to spangenberg. That said, I think the format variations are pretty much...
Forum: support.WinUAE 29 August 2023, 09:01
Replies: 8
Views: 1,416
Posted By Keir
I don't believe this formula. For a start it's...

I don't believe this formula. For a start it's non-linear with increasing radius...



Nonetheless yes I agree ~10Mbits theoretical capacity per side. If the outer track has 1.65x capacity, and...
Forum: support.WinUAE 28 August 2023, 20:51
Replies: 8
Views: 1,416
Posted By Keir
I think the physical limitation is flux density...

I think the physical limitation is flux density (rather than say bit jitter between the 4us/6us/8us bit bands --- this is probably more of an issue as you add bitbands like in RLL hard drives). The...
Forum: project.SPS (was CAPS) 28 August 2023, 17:02
Replies: 939
Views: 197,855
Posted By Keir
I have replied on that thread with an educated...

I have replied on that thread with an educated guess at what's going on.
Forum: support.WinUAE 28 August 2023, 17:01
Replies: 8
Views: 1,416
Posted By Keir
Educated guess: the OS does not expect such a...

Educated guess: the OS does not expect such a long track and does not fetch enough data on read to get the last sector. It would only work if you get lucky and read from the first sector in the...
Forum: project.SPS (was CAPS) 21 May 2023, 11:21
Replies: 939
Views: 197,855
Posted By Keir
I believe the LFSR-based pattern in the Copylock...

I believe the LFSR-based pattern in the Copylock pseudorandom data is a recent insight, and wasn't known or used by contemporary crack tools? In which case, the variations in LFSR behaviour across...
Forum: project.SPS (was CAPS) 20 May 2023, 12:50
Replies: 939
Views: 197,855
Posted By Keir
Thanks for the report. This should now be fixed.

Thanks for the report. This should now be fixed.
Forum: project.SPS (was CAPS) 08 May 2023, 19:53
Replies: 939
Views: 197,855
Posted By Keir
Sorry for introducing that bug! I wonder why I...

Sorry for introducing that bug! I wonder why I didn't see a build error?

EDIT: I'm on Ubuntu 20.04 and therefore GCC 9. How old!

EDIT2: Of course, it's a clang warning. I can repro with clang.
Forum: project.SPS (was CAPS) 25 April 2023, 11:31
Replies: 939
Views: 197,855
Posted By Keir
This is good to know. The PLL default is quite...

This is good to know. The PLL default is quite aggressive in adjusting the clock and therefore susceptible to certain kinds of high frequency noise including bit shifts. Having PLL phase adjustment...
Forum: project.SPS (was CAPS) 24 April 2023, 09:17
Replies: 939
Views: 197,855
Posted By Keir
This is the same illegal MFM problem. AA99 has...

This is the same illegal MFM problem. AA99 has two adjacent 1 bits, which corresponds to flux reversals only 2us apart. The second one tends to get pushed away from the first turning the last 9...
Forum: project.SPS (was CAPS) 23 April 2023, 23:10
Replies: 939
Views: 197,855
Posted By Keir
Fair enough. Different runs of titles do seem to...

Fair enough. Different runs of titles do seem to have been mastered differently sometimes, and/or SPS IPFs sometimes deviate from the original (if the game loader doesn't care).
Forum: project.SPS (was CAPS) 23 April 2023, 15:17
Replies: 939
Views: 197,855
Posted By Keir
I have written the official IPF #3061 back to...

I have written the official IPF #3061 back to disk with "--precomp=40=125:80=250" and it loads okay to the title screen (ie. well past the ramdisk screen).

I'm not sure if precomp helps so much on...
Forum: project.SPS (was CAPS) 23 April 2023, 15:04
Replies: 939
Views: 197,855
Posted By Keir
Okay, so I have done some analysis of Demolition...

Okay, so I have done some analysis of Demolition (SPS IPF #2012). This may also be relevant for disk-utilities analysis of your dump, so I will give details here.

Mainly for Abaddon: IPF #2012 vs...
Forum: project.SPS (was CAPS) 23 April 2023, 14:12
Replies: 939
Views: 197,855
Posted By Keir
Thanks for your testing. Looks like Abaddon is on...

Thanks for your testing. Looks like Abaddon is on the case for his anco/kingsoft analyser in disk-utilities.

Failure to write the official IPFs to disk using GW is my domain and I will investigate...
Forum: project.SPS (was CAPS) 23 April 2023, 11:14
Replies: 939
Views: 197,855
Posted By Keir
Can you please try the official IPFs #2708 and...

Can you please try the official IPFs #2708 and #2712? You can download these from the EAB file server.

This will help indicate if the problem is one of compatibility versus the anco/kingsoft...
Forum: project.SPS (was CAPS) 23 April 2023, 00:21
Replies: 939
Views: 197,855
Posted By Keir
Try conversion from SCP to IPF using...

Try conversion from SCP to IPF using disk-utilities. There are Windows builds advertised in this very forum thread. SCP will work for direct emulation or writeback sometimes, but not reliably for all...
Forum: project.SPS (was CAPS) 23 April 2023, 00:17
Replies: 939
Views: 197,855
Posted By Keir
I think the disk-analyse generated track for...

I think the disk-analyse generated track for Leavin' Teramis is unnecessarily fragile. I see this in the generator function:

tbuf_bits(tbuf, SPEED_AVG, bc_raw, 16, 0x5224);
...
Forum: project.SPS (was CAPS) 22 April 2023, 09:49
Replies: 939
Views: 197,855
Posted By Keir
What's your method? What image format? How are...

What's your method? What image format? How are you using those images?
Forum: project.SPS (was CAPS) 19 April 2023, 13:06
Replies: 939
Views: 197,855
Posted By Keir
A good way to get taken down for copyright...

A good way to get taken down for copyright violation!
Forum: project.SPS (was CAPS) 19 April 2023, 11:17
Replies: 939
Views: 197,855
Posted By Keir
I'm going to have a go at converting all SPS IPFs...

I'm going to have a go at converting all SPS IPFs to HFEv3 for Gotek use.
Forum: request.Old Rare Games 23 March 2023, 19:48
Replies: 124
Views: 10,949
Posted By Keir
How is the disk-analyse output differing? The...

How is the disk-analyse output differing? The only difference I can see is a small difference in track length (110000 bits vs 111000 bits) either of which is plenty more than the minimum length...
Forum: project.SPS (was CAPS) 10 March 2023, 12:14
Replies: 939
Views: 197,855
Posted By Keir
This is great, I am not producing totally broken...

This is great, I am not producing totally broken HFEv3 images. Although...



I suppose I should at least allow this to be manually specified when creating an HFE. I thought interface mode would...
Forum: project.SPS (was CAPS) 03 March 2023, 17:05
Replies: 939
Views: 197,855
Posted By Keir
Would there be any interest in batch converting...

Would there be any interest in batch converting all available IPF image files to HFEv3 and hosting the whole lot on the EAB file server?

This would be a useful library of original uncracked titles...
Forum: project.SPS (was CAPS) 02 March 2023, 09:51
Replies: 939
Views: 197,855
Posted By Keir
Or indeed Greaseweazle tools! By the way...

Or indeed Greaseweazle tools!

By the way HFEv3 support is now in latest FlashFloppy and Greaseweazle official releases.
Forum: project.SPS (was CAPS) 21 February 2023, 21:47
Replies: 939
Views: 197,855
Posted By Keir
Basically the format is raw data following a 4489...

Basically the format is raw data following a 4489 sync. Lots of different track formats fall under that very general heading. But for most we can do better (eg. there is actually a checksum)
Forum: project.SPS (was CAPS) 21 February 2023, 17:07
Replies: 939
Views: 197,855
Posted By Keir
Since the apprentice (hellwig) analyser permits...

Since the apprentice (hellwig) analyser permits no checksum if the checksum longword is zero, it's very easy for track to be mis-identified. Especially because track filler is usually all zeroes in...
Forum: project.SPS (was CAPS) 20 February 2023, 17:26
Replies: 939
Views: 197,855
Posted By Keir
There are absolutely SPS IPF images of...

There are absolutely SPS IPF images of non-aligned disks. For example 2234 (Xenon 2) and 0335 (Guy Spy), to name just two.
Forum: project.SPS (was CAPS) 19 February 2023, 12:10
Replies: 939
Views: 197,855
Posted By Keir
Not my area I'm afraid, but I'm given to...

Not my area I'm afraid, but I'm given to understand that Kryoflux DTC is good at C64 and knows most of the common protections. You should be able to dump to Kryoflux RAW using Greaseweazle and then...
Forum: project.SPS (was CAPS) 18 February 2023, 18:10
Replies: 939
Views: 197,855
Posted By Keir
I can't guarantee that my HFEv3 files will work...

I can't guarantee that my HFEv3 files will work with HxC firmware -- this is not tested or supported by me. My generated HFEv3 tracks are a little different than that produced by HxC tools and so it...
Forum: project.SPS (was CAPS) 11 February 2023, 17:36
Replies: 939
Views: 197,855
Posted By Keir
Interesting as I thought I had to extend/tweak...

Interesting as I thought I had to extend/tweak the HFEv3 format slightly. But actually in the FlashFloppy firmware supporting bit-granularity weak regions fell out quite naturally. Perhaps this is...
Forum: project.SPS (was CAPS) 10 February 2023, 21:45
Replies: 939
Views: 197,855
Posted By Keir
Great news! Thanks! The bigger announcement...

Great news! Thanks!

The bigger announcement here is that I will support any IPF on FlashFloppy, converted to HFEv3 using Greaseweazle tools. If any such conversion does not work then I expect to...
Forum: project.SPS (was CAPS) 10 February 2023, 16:18
Replies: 939
Views: 197,855
Posted By Keir
The required changes to Greaseweazle and...

The required changes to Greaseweazle and FlashFloppy are now done, pending release. They just need testing with the final HFEv3 images on a real Amiga. BarryB has promised to do this, hooray!
...
Forum: project.SPS (was CAPS) 09 February 2023, 18:39
Replies: 939
Views: 197,855
Posted By Keir
Thanks! I see Chaos Strikes Back in the...

Thanks!

I see Chaos Strikes Back in the Unofficial IPFs folder, but not Dungeon Master. Would it be possible for BarryB to upload an IPF, and get it transferred to the file server along with the...
Forum: project.SPS (was CAPS) 30 January 2023, 15:22
Replies: 939
Views: 197,855
Posted By Keir
Description and comparison with older MCUs: ...

Description and comparison with older MCUs:
https://github.com/keirf/FlashFloppy/wiki/Gotek-Models#artery-at32f435

Not so easy to find still, unfortunately. I have an eBay page (UK sales only):...
Forum: project.SPS (was CAPS) 30 January 2023, 15:19
Replies: 939
Views: 197,855
Posted By Keir
Yes indeed!

Yes indeed!
Forum: project.SPS (was CAPS) 29 January 2023, 21:28
Replies: 939
Views: 197,855
Posted By Keir
I was intending to add native IPF support to...

I was intending to add native IPF support to FlashFloppy for the newest Goteks with more RAM and CPU power. However I realised that supporting conversion to HFEv3 is good enough, and a lot easier!
Forum: project.SPS (was CAPS) 29 January 2023, 19:35
Replies: 939
Views: 197,855
Posted By Keir
Good question, with a complex answer. In short,...

Good question, with a complex answer. In short, the IPFs are for emulation only. The diamond-shaped flux pattern for which the DM protection is infamous cannot be represented in an IPF. Instead the...
Forum: project.SPS (was CAPS) 29 January 2023, 18:12
Replies: 939
Views: 197,855
Posted By Keir
If both DM and CSB IPFs now work, could someone...

If both DM and CSB IPFs now work, could someone please upload them to the File Server (or whatever it is now -- Turran FTP?) as Unofficial IPFs?
Forum: project.SPS (was CAPS) 19 July 2022, 19:18
Replies: 939
Views: 197,855
Posted By Keir
The squiggly-ness is noise. The distinct...

The squiggly-ness is noise. The distinct horizontal lines/bands are data.
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