It was provided for use with the [[Vortex Disc Drives]] from [[Vortex]] (F1-D, F1-S, F1-X, M1-D, M1-S or M1-X).
VDOS was supplied on an [[EPROM]], and was released in 3 4 versions:
* VDOS 1.0
* VDOS 2.0
* VDOS 2.0-X
* VDOS 2.11
* TO BE CONFIRMED: VDOS supports other double sided disc formats by programming the XDPB. AMSDOS doesn't allow this.
* When using CAS TEST EOF firmware function and soft end of file is reached the following conditions are return: carry true, zero false, A=&1A this is different to AMSDOS which has the conditions: carry false, zero false, A=&1A
* When using CAS IN OPEN/CAS OUT OPEN VDOS will crop the filename and extension part. i.e. if you use the filename "LONGFILENAME.LONGEXTENSION" it will crop it to "LONGFILE.LON" and attempt to load it. AMSDOS will give a 'Bad command' error.
* VDOS has different error codes compared to AMSDOS.
* You should push/pop ix and iy around firmware functions if you use them. VDOS appears to have different conditions for some CAS functions. TO BE CONFIRMED: exactly which functions are different.
== VDOS for Vortex Winchester Harddisk ==
* The VDOS for the WD20 doesn't seem to autodetect the harddisk. It asks you if the interface is connected before accessing it.
== Vortex Disc format ==
Image:VDOS-screenshot.JPG|Boot-up VDOS message
Image:VDOS-2.JPG|VDOS external look
Image:VDOS-internal.JPG|Internals photo(VDOS in a Modul-X)
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== Download ==
* [[Media:Vortex10.zip| V-DOS VDOS 1.0 ROM]] * [[Media:Vortex20.zip| VDOS 2.0 ROM]] * [[Media:VDOS20X.ROM| VDOS 2.0-X ROM]] * [[Media:VDOS_decoded_TFM.ROM | VDOS 2.11 ROM (decrypted, works as normal ROM but not in Vortex disc controllers. Hold space key after reset)]]
* [[Media:Vortex20.zip| V-DOS 2.0 ROM]]
* [[Media:VDOSisPD.pdf| A statement from the german company Vortex Computersysteme GmbH, VDOS is Public Domain]]