How to edit MSX files on PC?

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By Meits

Scribe (6042)

Meits's picture

28-10-2020, 21:10

Does rookie drive see it a 1.44MB floppy disk or as a mass storage medium which needs to be partitionized?

By Pencioner

Scribe (1194)

Pencioner's picture

28-10-2020, 21:17

RookieDrive works with 1.44 disks - one of my usb floppy devices even can't do 720K but works fine with RD (i got 3 usb floppies, and only one is perfect - supports 720K and works with RD, while there's even one drive which works with 720K but gives some protocol error with RD)

By joy_33

Rookie (20)

joy_33's picture

28-10-2020, 22:15

Thanks for the clarification, I'm sorry, but I didn't ask the question well.
I'm talking about using this tool: http://pen-code.com/download?id=MsxDiskTool
It is possible to create a floppy disk (single side 360kb, double side 720kb or CUSTOM)
Custom cannot be selected, why?
Is that an intention?

By robodrunk

Resident (50)

robodrunk's picture

28-10-2020, 23:22

This option is not yet implemented, sorry (Custom image sizes).
So the option is sort of a bad teaser.

By joy_33

Rookie (20)

joy_33's picture

02-11-2020, 23:31

I need advice, I'm still playing with this beautiful program http://pen-code.com/download?id=MsxDiskTool
But I can't open every disk image (DSK), is there any other way to get to the contents of the DSK file?

Why Do Some DSK Files Not Open?
Is there any protection against making changes to the content?

Thank you for the advice.

By robodrunk

Resident (50)

robodrunk's picture

05-11-2020, 15:59

Hi joy_33,

Some DSK files have no DOS format information on them, so those are containing some custom data.
I've seen quite a lot of those, like Konami Collection disks for example.
In that case MSX Disk Tool should show a "Custom Format" status for those DSK opened.

So this is not exactly a protection, but a more complicated problem. I think there are some tools that recognize ROMs on such disk images and can extract them.

By joy_33

Rookie (20)

joy_33's picture

06-11-2020, 16:00

Hello, and thank you for the information.
So MSX doesn't use any such protections even on original floppy disks like ZX Spectrum?
And where would I find a program that would open these DSKs?
I am new to MSX, I use several platforms (Commodore, Atari, ZX Spectrum, Oric Atmos, Enterprise etc.)
No less I was absorbed in the MSX scene, and I especially admire the user support and the fact that the scene around MSX is still alive and new programs and new hardware are being created, I personally bought MSX SX1 + PowerGraph V 9990 and MSX Blaster (OPL4).
The local WIKI section is absolutely amazing.

By Briqunullus

Master (200)

Briqunullus's picture

06-11-2020, 22:03

There are protected disk out there. Usually they mess around with sector checksums, so the disk will give read errors. The software checks whether these errors exist. If they do, the software will work correctly. To image these disks, convert them to the DMK disk image format. Emulators can handle them nowadays.

DSK files that don't open in Disk Tool are a different kind however. They just abandon the standard mapping of sectors and have created their own. So they will have a custom boot sector that loads the disk's contents. There is no FAT table, there is no directory structure. And as such, there are no files as we know them. There are just blocks of data, accessible only by reading the sectors directly.

You can still open and edit them with a hex editor like HxD on Windows. Take for example the Konami Game Collection disks mentioned above. Earlier this year I have created English translations for them. If you open them in HxD and scroll down, you will recognize the blocks of data and the empty spaces in between.

The thing is, every custom disk structure is different. Every software house used whatever they liked. Using maybe different schemes on different software titles. To understand them, you will need to reverse engineer them one by one.

What kind of changes would you want to make to them?

By Manuel

Ascended (17064)

Manuel's picture

06-11-2020, 22:45

Indeed, it would help if you would tell us what exactly you want to do and why Smile

By joy_33

Rookie (20)

joy_33's picture

07-11-2020, 09:38

Thanks for the information, so it's similar to elsewhere.
I'd like to look directly at the files on the floppy disk to get an idea of how it works, if the images are extra files and how the music data is loaded, just interested.

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