YaPaDOS is patch for [[AMSDOS]] and [[ParaDOS]] that allows to redirect disk access to harddisk. This is done with keeping highest possible compatibility, so only 20 bytes of RAM are used (including 6 used by ParaDOS).
== Diskimages ==
Instead of reading and writting floppy, a continous and limited area on harddisk is used, that has the same amount of sectors, as the floppy. The area is called diskimage. Each drive separately A: and B: can be directed to floppy or one of diskimages. You can change the diskimages as you would change the floppies, but by opening some special files.
Diskimages are selected by their numbers 1..999 (0 means floppy). Only the number after dot matters. Names of diskimages can be listed from a virtual device called superdisk. Superdisk is read-only. After the superdisk is selected, the diskimage then can be selected without the '''^''' sign in file name.
== Commands ==
The '''^''' sign placed as first in file name used in open file function tells the operating system to do something special: