omegabetax,
The Knoppix, if I understand this correctly, will give you a Linux OS that is in RAM. Once you boot to this, you can mount drive partitions and read/write to drives.
Linux reads FAT32 partitions, so you could access these.
It also reads FAT12, so you could type:
mount /mnt/floppy/
and mount a floppy disk that was in your A: drive.
If you experiment around with reading and writing to the floppy disk, be sure to type:
umount /mnt/floppy/
after you are finished, because otherwise, if you remove the floppy disk without unmounting it (yes, the command is spelled correctly) you may lose the data you expected to find on it.
Hope this helps get you started.
--torandson