Need help on reading exporting files from DSK Image

[drazil]

Hi,
i am on the way to develop a java based DSK Image reader which is working so far.


I use Manage DSK to check my results.


But in one case i don't know how to solve it.
What i have learned so far is, that normal files have a header with checksum which ASCII files haven't
When i now try to export one of these files everything is working fine.


But i found out that some files are not ASCII and doesn't have a header, too. For example the AMSDOS.COM file.
Is there any further documentation on this issue or do i have a fallacy?


Kind regards
Guido

[mr_lou]

Well I can't help you sadly, but just wanna say cool that you're doing a CPC tool in Java. 
Good to see other Java coders here. 

[drazil]

Thank you,
if you are interested in what i am working on
Here is the link :https://github.com/guidobonerz/nerdsuite


once grown up, it wants to be an ide for classic computing. Not only for cpc computers but also for commodore, atari,..

[neuro_sys]

Hello,


AMSDOS files (they are the ones that can be loaded or run through BASIC, or via CAS/DISC calls in the firmware) contain an AMSDOS header that has the checksum among other information. But not all files need to have AMSDOS header. For example CP/M files (with the extension of COM) won't have any AMSDOS header since they're meant to be run from CP/M, and CP/M doesn't know anything about AMSDOS. A text file may or may not have an AMSDOS header. It's all dependent on the interpreting program.