[[Image:Datamedia disc system.jpg|thumb|250px|Professional storage media]]
An early disc solution for the CPC 464from german company [[Data Media]]. Available in three versions with two, three, or four 5.25" drives. The capacity per disc is 780Kbytes, the four drive version was announced to store up to 3.2Mb of data. Due to the price and AMSDOS-incompatibility this system lost to another german third-party company of disc systems for the CPC, [[Vortex Computersysteme]].
Manufactured by the German company [[Data Media]].== FDOS ==
Avaliable in two versions with two or four drives. The four drive version disc operating system was able called FDOS (non-AMSDOS compatible) and was stored on the controller board in an 8Kb eprom.Unlike as under AMSDOS, the cassette commands are hooked (ie. LOAD does access the normal cassette routines). Instead, the disc is accessed via RSX commands (according to store up the review: |LOAD "filename" - though that info appears to 3.2Mb of databe incorrect - correct should be |LOAD,a$ with comma, and for 464 BASIC: with string variable).The supported RSX commands are:
The disc operating system was called FDOS and was stored on the controler board in an 8Kb eprom. Data Media also delivered patches that made the drives availiable under [[ |MON Monitor/Debugger |CPM Start CP/M]].(or other boot-able disc) |A,|B,|C,|D Select drive A-D |LOAD Load File |SAVE Save File |DIR Show Directory |ERA Erase File |REN Rename File |OPENIN Open Input File |OPENOUT Open Output File |CLOSE Close Input/Output File |READ Read from Input File |WRITE Write to Input File |RUN Load and Start File |MERGE Merge File |INIT Format Disc
This controler was unlike all later disc controlers for the CPC based on the WD2797 chipset.== Filesystem ==
As FDOS uses a special feature the controler board had an integrated [[RS232]] interfacefilesystem with 20 characters per filename, and max 72 files per disc (much different to standard CPC and CP/M filesystems which use 8.3 characters per filename).
Due == CP/M == According to the price this review, the data media disc system lost to another third part company was shipped with [[CP/M]], and included support for confuguring the drive parameters of each drive to work with other CP/M filesystem dialects from other systems. Whilst being more or less incompatible with 3" CPC disc format, this did at least provide compatibility with 5.25" CP/M discs from other systems for the . == Controller == The drive unit contains a WD2797 controller chip from Western Digital. That, unlike as all other CPCdisc interfaces, which typically contain [[765 FDC|uPD765]] controller chips. == RS232 Interface == As a special feature the controller board had an integrated [[RS232]] interface. This was mentioned as optional feature in the review from 8/1985, it wasn't mentioned at all in the advert from 8/1985, it was mentioned as built-in feature in the advert from 12/1985 (so, it's unclear if all units were delivered with installed RS232 interface). == Software == Data Media released about 12 games and 24 utilities on 5.25" discs (for a complete list, see the [[Vortex ComputersystemeData Media]]page).
== Data sheet ==
* [[Media:Wd2797 datasheet.pdf|Datasheet of the disc WD2797 controler]]
== Reviews ==
This system was reviewed in [[CPCAI]] #9, 1985
<gallery caption="Review in CPC Schneider International 8-85">
File:Data Media Review (CPC International 08-85, page 26).jpg|Review 1/2 (german)
File:Data Media Review (CPC International 08-85, page 27).jpg|Review 2/2 (german)
</gallery>
== Adverts ==
<gallery>
File:Data Media Advert (CPC International 08-85, page 2).jpg
File:Data Media Advert (CPC International 12-85, page 68).jpg
</gallery>
== Downloads ==
* FDOS rom-image - none such...?
* 5.25" disc images - none such...?
== Links ==
[[Category:Peripherals]][[Category:DATA Storage]]