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Old 08 January 2023, 14:59   #341
BarryB
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I have the Super Skidmarks data disks but they are still sealed in the box
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Old 15 January 2023, 23:27   #342
acd2001
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keirf disk-utilities 2023-01-15 git 41d8247
Added CHW decoder, support for Speeddball US, Tennis Cup Protection, Space Harrier Decoder
Support a variant of RNC Protect Process as used on Eco (Ocean, Denton Designs)

Last edited by acd2001; 24 January 2023 at 18:33.
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Old 16 January 2023, 16:43   #343
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My dump of Eco now supported, Super Skidmarks is being a pain!!
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Old 24 January 2023, 18:33   #344
acd2001
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keirf disk-utilities 2023-01-24 git 6e63989
Add decoder for Detector and Turn It, minor tweak
to The Plague protection to support another version

Last edited by acd2001; 29 January 2023 at 17:25.
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Old 24 January 2023, 19:22   #345
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Cheers
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Old 24 January 2023, 19:59   #346
dlfrsilver
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Thanks !
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Old 28 January 2023, 13:15   #347
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disk-utilities (analyse) a995b21 doesn't make a usable ipf of working Chaos Strikes Back (FTL) v_3.3.scp

Link to scp image: http://ftp2.grandis.nu/turran/FTP/~U...(FTL).v3.3.rar

Last edited by Snoopy1234; 28 January 2023 at 13:17. Reason: disk-utilities version added
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Old 28 January 2023, 18:01   #348
BarryB
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Run the SCP though disk-utilities again and create another SCP file from it, then put the new SCP through disk-utilities again and create an IPF from it!

This was Keir's advice when he was doing Dungeon Master, it cleans up the SCP file prior to creating the IPF.
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Old 29 January 2023, 01:53   #349
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Quote:
Originally Posted by BarryB View Post
Run the SCP though disk-utilities again and create another SCP file from it, then put the new SCP through disk-utilities again and create an IPF from it!

This was Keir's advice when he was doing Dungeon Master, it cleans up the SCP file prior to creating the IPF.
Ok Thanks I'll give it a try.
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Old 29 January 2023, 02:19   #350
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Still No Dice. Disk-analyse hasn't created a working replica of the csb_v.3.3.scp with --format option or without. No ipf either.
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Old 29 January 2023, 14:10   #351
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The SCP might be bad or DU doesn't yet support CSB? Checking my 2 Kryoflux dumps of CSB they also fail to load so it might not be supported for emulation like DM was?

I've emailed Keir for clarification!
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Old 29 January 2023, 17:25   #352
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keirf disk-utilities 2023-01-29 git ef2af52
Dungeon Master, Chaos Strikes Back: Fix GAP3. Should be 41 bytes, not 40.
Fixed CSB protection check.

Last edited by acd2001; 30 January 2023 at 19:13.
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Old 29 January 2023, 17:52   #353
BarryB
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Originally Posted by acd2001 View Post
keirf disk-utilities 2023-01-29 git ef2af52
Dungeon Master, Chaos Strikes Back: Fix GAP3. Should be 41 bytes, not 40.
Fixed CSB protection check.


Keir kindly updated disk-utilities for Chaos Strikes Back

As CSB is really difficult my characters from DM are pathetic and die too quickly, so if someone has better characters can they be tested on the new update of disk-utilities?

My version of CSB is v3.5 from the Psygnosis release! Uploaded the IPF's to the Zone!!
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Old 29 January 2023, 19:12   #354
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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?
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Old 29 January 2023, 19:15   #355
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If somebody can confirm they work I'll gladly add them to the unofficial IPFs on 'the server'
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Old 29 January 2023, 19:47   #356
BarryB
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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?
Are these still only for emulation use, not writing back to real disks?
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Old 29 January 2023, 20:35   #357
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Are these still only for emulation use, not writing back to real disks?
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 generated IPF uses very short (1-2 bitcell) weak regions to simulate the fuzzy most-significant bit in each data byte in the protection sector. Not a problem for an emulator to randomise one or two bits; but impossible to write to disk without being smart enough to swap back in something like the "diamond flux" trick.

To write to disk, the IPF can be converted to SCP using disk-utilities. The generated SCP *does* have the diamond-shaped flux pattern and will write to disk just fine using, for example, Greaseweazle.

Finally, I am working on IPF to HFEv3 conversion in the Greaseweazle tools. This will also support conversion of the DM and CSB IPF images to HFEv3 images which FlashFloppy will support. However it will require a small extension to HFEv3 to support bit-granularity weak regions. So will require a new release of both Greaseweazle tools and FlashFloppy firmware. Watch this space in the coming weeks.

EDIT: It might be worth zipping the IPFs up with a README which summarises the above, if uploaded to the server.

Last edited by Keir; 29 January 2023 at 22:28.
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Old 29 January 2023, 22:02   #358
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I uploaded Barry's ipfs to my user upload folder all renamed TOSEC style with a readme quoting what Keir wrote above.
Quote:
The diamond-shaped flux pattern for which the DM protection is infamous cannot be represented in an IPF.
Instead the generated IPF instead uses very short (1-2 bitcell) weak regions to simulate the fuzzy most-significant bit in each data byte in the protection sector.
Not a problem for an emulator to randomise one or two bits; but impossible to write to disk without being smart enough to swap back in something like the "diamond flux" trick.
@TCD
I upped three ipfs yesterday, these will be supported in disk-analyse once Abaddon pushes his update to disk-utilities git repo.

All tested and verified working 100%.
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Old 29 January 2023, 22:11   #359
BarryB
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I did wonder if SCP was still viable for writing, you've now explained it is

HFEv3 files aren't that much bigger than IPF, probably 2mb over 1mb, but with large GB capacity USB sticks going for a few quid that won't be an issue!
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Old 29 January 2023, 22:28   #360
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Quote:
Originally Posted by BarryB View Post
I did wonder if SCP was still viable for writing, you've now explained it is

HFEv3 files aren't that much bigger than IPF, probably 2mb over 1mb, but with large GB capacity USB sticks going for a few quid that won't be an issue!
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!
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