Search found 3125 matches

by ijor
Wed Jan 29, 2020 5:33 pm
Forum: Hardware
Topic: Megafile 60 problems
Replies: 57
Views: 6456

Re: Megafile 60 problems

Yes, I was wrong, and I can admit to mistake... but you could say that without offending me, by writing that I'm taking nonsense. Yes, sector numbers are stored in their headers, and this information is enough to arrange them in the right order. Sorry about that. But I replied politely once. You in...
by ijor
Wed Jan 29, 2020 2:56 pm
Forum: Hardware
Topic: Megafile 60 problems
Replies: 57
Views: 6456

Re: Megafile 60 problems

There was no standard way of keeping drive configuration, some controller keep the configuration in NVRAM, some keep it on the drive itself. It was common for that controllers to use sector interleave and head/platter sector skew, without this data, even if you could make a binary copy of sectors, ...
by ijor
Wed Jan 29, 2020 1:59 pm
Forum: Hardware
Topic: Megafile 60 problems
Replies: 57
Views: 6456

Re: Megafile 60 problems

I got a quote of £450 to recover the data but am holding out for a better deal elsewhere from someone more experienced with 80’s tech amd RLL. That quote is surely for a "normal' recovery that assumes the ST-277R is fully working. Otherwise, say the disk is not spinning, we are talking about a comp...
by ijor
Wed Jan 29, 2020 12:50 pm
Forum: Hardware
Topic: Megafile 60 problems
Replies: 57
Views: 6456

Re: Megafile 60 problems

Hi Markus, It is definitely an RLL drive (Seagate ST-277R). The Megafile 30 and 60 units are identical other than the size of the Seagate drive housed within. I am also in contact with a couple of data recovery companies but so far nobody has the controllers to enable accessing the disk to do a data...
by ijor
Wed Jan 29, 2020 12:34 pm
Forum: Hardware
Topic: Megafile 60 problems
Replies: 57
Views: 6456

Re: Megafile 60 problems

It is not so easy operation with these drives. Remember that these drives had only mechanical parts and analogue front end on them, while the actual drive controller is on the card (in PC) or on the controller board in the HDD case. Details of the formatting depends on the controller BIOS, so it is...
by ijor
Mon Jan 27, 2020 11:52 pm
Forum: Applications
Topic: Req : "Audio Sculpture" (STX,...) even not running...
Replies: 244
Views: 55734

Re: Req : "Audio Sculpture" (STX,...) even not running...

So it would not check duplicate sector on track 0 (or did you made the test using AS V1.2 that does not have duplicate?) Tested ver 1.3, sorry for not being clear enough. It doesn't check those headers on track 0, not that I see at least up to the point that you can actually run the program. Concei...
by ijor
Mon Jan 27, 2020 5:18 pm
Forum: Applications
Topic: Req : "Audio Sculpture" (STX,...) even not running...
Replies: 244
Views: 55734

Re: Req : "Audio Sculpture" (STX,...) even not running...

I don't remember seeing protected dumps of No Buddies Land or Son Shu Shi . Do you have the original disks or copy protected images? If so, could you please post them, thanks. I don't have original disks/images of these 2 games. However, 2/3 of the protection code is still present in the cracked ve...
by ijor
Mon Jan 27, 2020 5:14 pm
Forum: Applications
Topic: Req : "Audio Sculpture" (STX,...) even not running...
Replies: 244
Views: 55734

Re: Req : "Audio Sculpture" (STX,...) even not running...

I made a quick check at what the programs reads from the disk. It performs something like that: Read sector(s). track: 0 (0), side: 0, sector: 1 Read sector(s). track: 0 (0), side: 0, sector: 2 Read sector(s). track: 1 (1), side: 0, sector: 1 Read sector(s). track: 1 (1), side: 0, sector: 3 Read sec...
by ijor
Mon Jan 27, 2020 1:51 am
Forum: Applications
Topic: Req : "Audio Sculpture" (STX,...) even not running...
Replies: 244
Views: 55734

Re: Req : "Audio Sculpture" (STX,...) even not running...

This protection has been used on all software released by Expose Software: Audio Sculpture (all versions), No Buddies Land and Son Shu Shi. I traced the protection under Hatari and found that the software part is very close from one release to another (there are only small variations). I don't reme...
by ijor
Mon Jan 27, 2020 1:17 am
Forum: Applications
Topic: Req : "Audio Sculpture" (STX,...) even not running...
Replies: 244
Views: 55734

Re: Req : "Audio Sculpture" (STX,...) even not running...

Te minimum gap II size at MFM is 28, not 32. Where did you get this number from? If I am right the 32 bytes comes from the WD1772 datasheet. But to be honest the table that indicates the min values of the gaps is specially unclear. By reverse engineering the FDC, of course. The datasheet is wrong, ...
by ijor
Sun Jan 26, 2020 1:36 pm
Forum: News & Announcements
Topic: Atari Grants Licensing Rights to Build Atari Hotels in the United States
Replies: 23
Views: 3626

Re: Atari Grants Licensing Rights to Build Atari Hotels in the United States

At the current share price, you'd just need ca. 40 million Euro to become the majority shareholder in Atari SA. ;) Ouch, I thought it was a much smaller company once it went bankrupt a few years ago. But Atari SA, apart from the name, have nothing to do with the Atari we love. Atari SA is the compa...
by ijor
Sat Jan 25, 2020 11:44 pm
Forum: Floppy Disk Preservation
Topic: Floppy Disk Stream Image Repository
Replies: 268
Views: 85292

Re: Floppy Disk Stream Image Repository

Is there any advantage to dumping at more than 5 revolutions? Some would say that the more the merrier, but you reach a point that more revolutions don't add any significant value and then it is not worth. For most cases even 5 revolutions aren't really need it. We do it just in case. Remember this...
by ijor
Sat Jan 25, 2020 11:41 pm
Forum: News & Announcements
Topic: Atari Grants Licensing Rights to Build Atari Hotels in the United States
Replies: 23
Views: 3626

Re: Atari Grants Licensing Rights to Build Atari Hotels in the United States

I wonder how much Atari is worth nowadays. I wonder (may be more dream that wonder) if it wouldn't be possible for the Atari/retro community to collect the necessary money to buy the Atari rights and put them in the public domain.
by ijor
Sat Jan 25, 2020 11:36 pm
Forum: Applications
Topic: Req : "Audio Sculpture" (STX,...) even not running...
Replies: 244
Views: 55734

Re: Req : "Audio Sculpture" (STX,...) even not running...

Yes you are right the minimum distance is 32 bytes (usually 24 x $4E + 8 x $00) but here we only have 13 bytes (2 x $4E + 11 x $00) Te minimum gap II size at MFM is 28, not 32. But using the read address command you should be able to read 18 sector address even if all sectors with address above 11 ...
by ijor
Thu Jan 23, 2020 4:54 pm
Forum: Floppy Disk Preservation
Topic: Floppy Disk Stream Image Repository
Replies: 268
Views: 85292

Re: Floppy Disk Stream Image Repository

Fair enough. (Just asking: how come the KF dumps are so much larger then, file size wize?) The size of the dumps doesn't have much to do with the sampling accuracy. It depends more on the file format and the encoding. Anyway, KF and SCP dumps should be about the same size. Are you dumping 5 revolut...
by ijor
Thu Jan 23, 2020 4:37 pm
Forum: MiST
Topic: It's no more a MiSTery
Replies: 402
Views: 80382

Re: It's no more a MiSTery

No, I haven't tried with other than the monitor that I currently setup with the MiST. Perhaps I should try another one . The monitor I'm using (Benq XL2411T) seems to run everything else I've thrown at it. Sync signals are usually taboo in the ST world, but some demos are messing with them (maybe b...
by ijor
Thu Jan 23, 2020 4:14 pm
Forum: Applications
Topic: Req : "Audio Sculpture" (STX,...) even not running...
Replies: 244
Views: 55734

Re: Req : "Audio Sculpture" (STX,...) even not running...

As described in my document I am also trying to differentiate “sector write splice” from “track write splice”. To be able to make the distinction between the two requires high-level analysis. The reason for detecting sector write splice is to be able to detect if a FD has been modified (tampered). ...
by ijor
Thu Jan 23, 2020 1:36 pm
Forum: Floppy Disk Preservation
Topic: Floppy Disk Stream Image Repository
Replies: 268
Views: 85292

Re: Floppy Disk Stream Image Repository

I spent a little bit of time talking to the guys on the Video Game Preservation Society, and it looks like the GW/Supercard Pro doesn't image the disks at a high enough resolution for preservation, unlike the Kryoflux. So, I may need to do this all again, with a KF. Tch :) Exactly who told you that...
by ijor
Thu Jan 23, 2020 3:04 am
Forum: Floppy Disk Preservation
Topic: Floppy Disk Stream Image Repository
Replies: 268
Views: 85292

Re: Floppy Disk Stream Image Repository

I've put together my Greaseweazle, and made a few dumps ... Is there anywhere in particular you want this? (Or, indeed, all of these?) Hi, thank you very much. Yes, if you can dump and upload all the original disks you have, that would be great. Please label each image with as much information as p...
by ijor
Thu Jan 23, 2020 2:08 am
Forum: 680x0
Topic: Data register sign extension
Replies: 5
Views: 1290

Re: Data register sign extension

The 68000 never modifies just the low word of an address register. This is part of the 68K philosophy and probably well known. The MOVEM instruction is rather unique in that it doesn't distinguish between address or data register destinations. So the principle of sign extension is applied in either ...
by ijor
Thu Jan 23, 2020 1:53 am
Forum: Applications
Topic: Req : "Audio Sculpture" (STX,...) even not running...
Replies: 244
Views: 55734

Re: Req : "Audio Sculpture" (STX,...) even not running...

Hi Jean, But most of my problems are related to write splice detection ... So if Ijor is still looking at this thread I have a question for him (actually anybody is welcome to answer): Can you explain simply what is the best way to detect the write splice. I am currently using a very complex process...
by ijor
Tue Jan 21, 2020 6:33 pm
Forum: Games - General
Topic: Dungeon Master Copy Protection
Replies: 3
Views: 4094

Re: Dungeon Master Copy Protection

Sorry for the late follow up. I missed this thread ... Quite a few mistakes there... 3. Rob Northen protection wasn't based on a protected "long track" with no sectors, it was a single protected sector with non-standard data rate within that sector There is an early Copylock/Rob Northen copy protect...
by ijor
Tue Jan 21, 2020 6:23 pm
Forum: MiSTer
Topic: FX CAST Atari ST core
Replies: 336
Views: 158981

Re: FX CAST Atari ST core

... though the aspect ratio is still broken .. but I suspect thats due to not having the updated framework with the scaler and such. So unfortunate that this core is so close but a few key features dont work and it still lacks proper framebuffer support so it has that weird default video mode that ...
by ijor
Thu Jan 16, 2020 3:51 am
Forum: 680x0
Topic: Understanding the Union Demo's Opening of left and right borders
Replies: 37
Views: 7069

Re: Understanding the Union Demo's Opening of left and right borders

I've adjusted it to "a latency in being signalled to the MFP and in the MFP responding to the change in its input" to clarify that I don't think electrons are somehow having a bit of a nap halfway along a trace or anything like that. I intend this to be consistent with your comment elsewhere, a lon...
by ijor
Wed Jan 15, 2020 7:51 pm
Forum: 680x0
Topic: Understanding the Union Demo's Opening of left and right borders
Replies: 37
Views: 7069

Re: Understanding the Union Demo's Opening of left and right borders

I strongly disagree. Furthermore, it's a wiki so there's a full edit history so nothing has been lost. If someone else agrees with you and wants to do something about it then it's an easy fix. So — obiter — even if I did agree, it would be invalid to argue that any damage had been done. Amongst the...

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