reading and writing from/to cdt file

[Fran123]

Hello

Do you know any webpage where someone explain how to manage a cdt file in an emulator?

Thank you!

[Nich]

Do you know any webpage where someone explain how to manage a cdt file in an emulator?

If you mean the CDT file specification, you can find it at the URL below. (It refers to the "TZX technical specifications", but CDT files use exactly the same format; the only difference is the file extension.)

https://worldofspectrum.net/TZXformat.html

[Prodatron]

There is a CPC Wiki article about this as well, which has mostly but not exactly the same information:

https://www.cpcwiki.eu/index.php/Format:CDT_tape_image_file_format