GX4000 cpr format: Is it possible to extract the files?

[pmeier]

Looks like that nocart is a one-way tool, but I'd like to get the files back, because I want to add a trainer menu additionally to the joystick-only patches. Or change some controls... etc...

I started compiling my ultimate personal collection and for the last game I simply diffed snapshots, so that I don't have to find out memory locations. Still a little bit cumbersome.

Is there a better way? Are the changes somewhere documented?
The GX4000 conversion list is pretty overwhelming long. Great job. Could spare me a lot of time...

[andycadley]

From a generic CPR, no because there aren't really any files. From one created using one of the DSK->CPR conversion tools you probably can in theory, although I don't know if anyone has made any specific tools to do so (probably the assumption was they were converted from DSKs already in circulation)

[pmeier]

That's no good news... so if you have any better suggestions for me than comparing binaries...

Let me suggest to publish CPRs and DSKs always together... would you... please???

[Sykobee (Briggsy)]

It depends on whether the CPRs generated from discs have some form of catalogue block or not, to tell the game's loader where each file is in the CPR when loading. I believe that these CPRs are pretty much emulating a disc on the cart so it should have something similar, unless the game is patched to the extent of replacing file loads with cart memory copies.

[Duke]

If you have an M4 board, you can |CD into the CPR disk images and use |DSKX to extract the files.

[dragon]

Looks like that nocart is a one-way tool, but I'd like to get the files back, because I want to add a trainer menu additionally to the joystick-only patches. Or change some controls... etc...

I started compiling my ultimate personal collection and for the last game I simply diffed snapshots, so that I don't have to find out memory locations. Still a little bit cumbersome.

Is there a better way? Are the changes somewhere documented?
The GX4000 conversion list is pretty overwhelming long. Great job. Could spare me a lot of time...

The mine should be with source code in cpr thread. But if you need someone in particular. I can search it.


Extract the files from dsk don't work with my games, because, some of my games are a mix of basic+assembly code in the dsk+external code in the cartridge. As mostly are made in asm and uses the external storage of nocart.

[pmeier]

Thanks for your hints. Now I can continue with my project... 
But if someone does a nocart reverse tool, I'm user number one.