Martin Rosenau

Fixed bug in documentation

I started the work on this format because I wanted to test data transfer tools. One example would be "Big Blue Reader", which is a tool that can read, write and format MS-DOS disks on a 1581. Especially when a sector size of 256 or 1024 bytes is used (which would be the case for Acorn disks), such tools won't work with any of the present disk formats.

(Deleted; posted comment as "Reply" instead)

"DD" was not intended to be the name of the format; I wanted to say that the format describes a double density floppy disk, which was labelled "DD" in the 1980s. Storing the single pulses would allow to use such a format for RLL disks instead of MFM disks so 1541 disks could also be described by this format. On the other hand I saw that VICE (I had a look at the 3.2 sources) internally already uses the file format I suggested to store. The data sheets of the WD177x and the uPD7xx65 disk controllers...

@Ingo: "DD" was not intended to be the name of the format; I wanted to say that the format describes a double density floppy disk, which was labelled "DD" in the 1980s. Storing the single pulses would allow to use such a format for RLL disks instead of MFM disks so 1541 disks could also be described by this format. On the other hand I saw that VICE (I had a look at the 3.2 sources) internally already uses the file format I suggested to store. The data sheets of the WD177x and the uPD7xx65 disk controllers...

Raw DD disk image format

If it is necessary to reproduce the error: I'm using Ubuntu 18.04.1 LTS (x86-64)

Saving as PNG will lead to wrong gray scales