[[Image:Superdisk.gif|right]] 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). == What is this? == Not quite clear... Seems to be an AMSDOS clone from [[Yarek]] (?), for supporting his [[IDE8255]] (?) harddisk interface? Please confirm!
== Diskimages ==
Instead of reading and writting floppy, a continous and limited area on harddisk is used. The area has the same amount of sectors, as the floppy and is called diskimage. Each drive A: and B: separately 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.
Using only 20 bytes of RAM makes features like FAT32 and support for .DSK files impossible, so the disk must have special formatting using IDEDOS structures (defined by Garry Lancaster). The harddisk can also contain FAT partitions, but they are not accessible from YaPaDOS.
The IDEDOS partition contains diskimages, that can have various size (e.g. 180kB, 800kB, 5MB). Up to 999 diskimages can be created and accessed.
Diskimages are selected by their numbers 1..999 (0 means floppy) , by opening a file of special name. 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 ==
'''LOAD"^"''' - selects superdisk
'''LOAD"^.nnn"'''<BR>'''LOAD"^xxxxxxx.nnn"''' - selects diskimage number nnn(n - a digit, x - any character)
'''LOAD"^.0"''' - selects floppy
'''LOAD"^DESTROY.MBR"''' - clears MS-DOS partition table (also needs some POKEs for safety, see included README!.TXT)
'''LOAD"^DBnnnnn.mmm"''' - creates IDEDOS partition of nnnnn cylinders and up to mmm diskimages (needs some POKEs to set CHS geometry, see included README!.TXT)
'''LOAD"^MAKENEW"''' - adds diskimage respectively to current XDPB
Also, as creation of new diskimage gives it a fixed name, the '''|REN''' working on superdisk can be added.
All suggestions and ideas are welcome, please use the [http://groups.yahoo.com/group/futureos Yahoo! Groups list of FutureOS]. Download Alpha7 from: [http://cpc.yarek.com/amsdos2.zip http://cpc.yarek.com/amsdos2.zip] (version for SymbiFace IDE, plase contact to get other, e.g. CPCISA). Please backup all your harddisk data before use, as this version can include dangerous bugs.<br> * Done since 2007-11-04:<BR>+ Special XDPB is set for superdisk XDPB.<BR>+ Diskimage sizes listed in superdisk.<BR>+ List floppy on superdisk.<BR>+ Support of IDE8255 (DSKHNDLR is written).<BR>+ LBA start is #000000 not #000001.<BR>+ Startup message with name of DSKHNDLR.<BR>+ Redirection to floppy when wrong diskimage is selected.<BR>+ Forbid disk creation from superdisk (has inadequate XDPB).<BR>+ Corrected XDPB of new diskimage (cylinders and sides).<BR>+ PARADOS |DRIVE tool installed in ROM bank 6 as |PRIVE.<BR>+ Size of floppy (diskimage ".000") is zero.<BR>
Download from* Done but not released: [http://cpc.yarek.com/amsdos2.zip cpc.yarek.com/amsdos2.zip] and please backup all your harddisk data before use, + PARADOS |DRIVE tool installed in ROM bank 15 as this version can include dangerous bugs|DRIVE. BTW it <BR>+ Formatting done on superdisk creates data structures with minor errors, so you would need new diskimage (also from |DRIVE tool).<BR>+ Corrected free space printing in CAT to delete them later anywayallow larger numbers.<BR>+ Better PARADOS |DRIVE tool synchronization.<brBR>
* To do is:<brBR>- Support for Vortex 704 format.<br>- Support of IDE8255 (DSKHNDLR to be written).* To fine tune is:<br>- Some bytes of XDPB of new diskimage.<br>- Recelculate amount of free space in sectors.<br>- Move the free space entry towards end of partition list.<br>- Correct message when wrong diskimage is selected.<br>- Test of Rename diskimages placed over #0010000 LBA.<br>- Test of large diskimages (over 184 blocks).<br>- Selection of diskimages number over 99.<br>- Listing diskimages above number 99.<br>- XDPB of from superdisk XDPB (partition size).<br>- Correct free space printing in CAT to allow larger numbers.<br>- Diskimage sizes listed in superdisk.<br>- Solve the "Broken in" error.<brBR>- Support for diskimages with sectors of 256B and 1kBVortex 704 format.<br>- Correct support for Master/Slave.<br>- List floppy on superdisk.<br>- Installing PARADOS |DISC tool to other ROM bank<brBR>
* To fine tune is:<brBR>- Recelculate amount of free space in sectors.<BR>- Move the free space entry towards end of partition list.<BR>- Test of diskimages placed over #0010000 LBA.<BR>- Test of large diskimages (over 184 blocks).<BR>- Test of selection of diskimages number over 99.<BR>- Test of listing diskimages above number 99.<BR>- Solve the "Broken in" error.<BR>- Support for diskimages with sectors of 256B and 1kB.<BR>- Correct support for Master/Slave.<BR>- IDE interface type detection (SF2, IDE8255, CPCISA).<BR>- Display real number of units after DSKHNDLR detection.<BR>
<br>
[[Category:Stub]] [[Category:Disc Operating_System]]