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- Commodore_4040 abstract "The Commodore 4040 is the replacement for the previous models 2040 (USA) and 3040 (Europe). It's a dual-drive 5¼" floppy disk subsystem for Commodore International computers. It uses a wide-case form, and uses the parallel version of the IEEE-488 interface common to Commodore PET/CBM computers.These drive models use a single-density, single-side floppy data storage format similar to that used by the Commodore 1540 & Commodore 1541 drives, but with a slightly different data marker indicating which model originally formatted the disk. The low-level disk format is similar enough to allow reading between models, but different enough that one series of drive models cannot reliably write to disks formatted with one of the other model series. A difference of one extra 'header' byte is what causes this write incompatibility.The Group Code Recording (GCR) scheme of binary encoding is used to store data on the magnetic disk medium. The drive also uses variable bit-clock to enable increased data density on a standard single-density floppy disk. It is a form of constant bit-density recording done by gradually increasing the clock rate (zone constant angular velocity, ZCAV) and storing more physical sectors on the outer tracks than on the inner ones (zone bit recording, ZBR). Starting with the Commodore 2040 drive, this enabled Commodore to fit 170kB on a standard single-sided single-density 5.25" floppy.".
- Commodore_4040 thumbnail Commodore4040.jpg?width=300.
- Commodore_4040 wikiPageExternalLink 31.
- Commodore_4040 wikiPageExternalLink ckb.
- Commodore_4040 wikiPageID "1934686".
- Commodore_4040 wikiPageLength "1787".
- Commodore_4040 wikiPageOutDegree "11".
- Commodore_4040 wikiPageRevisionID "672041302".
- Commodore_4040 wikiPageWikiLink Areal_density_(computer_storage).
- Commodore_4040 wikiPageWikiLink Commodore_1540.
- Commodore_4040 wikiPageWikiLink Commodore_1541.
- Commodore_4040 wikiPageWikiLink Commodore_International.
- Commodore_4040 wikiPageWikiLink Commodore_PET.
- Commodore_4040 wikiPageWikiLink Constant_bit-density.
- Commodore_4040 wikiPageWikiLink Floppy_disk.
- Commodore_4040 wikiPageWikiLink Group_code_recording.
- Commodore_4040 wikiPageWikiLink IEEE-488.
- Commodore_4040 wikiPageWikiLink Zone_bit_recording.
- Commodore_4040 wikiPageWikiLink Zone_constant_angular_velocity.
- Commodore_4040 wikiPageWikiLink File:Commodore4040.jpg.
- Commodore_4040 wikiPageWikiLinkText "4040".
- Commodore_4040 wikiPageWikiLinkText "Commodore 4040".
- Commodore_4040 wikiPageWikiLinkText "Commodore PET dual drive".
- Commodore_4040 hasPhotoCollection Commodore_4040.
- Commodore_4040 wikiPageUsesTemplate Template:Commodore_disk_drives.
- Commodore_4040 wikiPageUsesTemplate Template:Microcompu-stub.
- Commodore_4040 hypernym Replacement.
- Commodore_4040 type Software.
- Commodore_4040 type Microcomputer.
- Commodore_4040 type Microcontroller.
- Commodore_4040 comment "The Commodore 4040 is the replacement for the previous models 2040 (USA) and 3040 (Europe). It's a dual-drive 5¼" floppy disk subsystem for Commodore International computers.".
- Commodore_4040 label "Commodore 4040".
- Commodore_4040 sameAs Commodore_4040.
- Commodore_4040 sameAs Commodore_4040.
- Commodore_4040 sameAs m.06783f.
- Commodore_4040 sameAs Commodore_3040.
- Commodore_4040 sameAs Q477804.
- Commodore_4040 sameAs Q477804.
- Commodore_4040 wasDerivedFrom Commodore_4040?oldid=672041302.
- Commodore_4040 depiction Commodore4040.jpg.
- Commodore_4040 isPrimaryTopicOf Commodore_4040.