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- Cromemco_4FDC abstract "The Cromemco 4FDC Floppy Disk Controller is designed to interface both 5.25- and 8.0-inch floppy disk drives to the S-100 computer bus used in Cromemco and other IEEE 696 computers. It also contains an RS232 serial I/O channel with software-selectable baud rates from 110 to 76,800. In addition, it has a 1 KB resident 2708 ROM containing Cromemco's RDOS, the resident disk operating system.The 4FDC was designed to drive Persci 277 8-inch single-density floppy drives. These drives were interesting in two respects: They used a fast voice coil actuator and not a stepper motor to position the drive read write head. The data separator electronics were on the drive itself.Due to the second fact, an unmodified 4FDC can not be used with 8-inch drives that don't have single-density data separators on the drive electronics. Later Cromemco disk controllers such as the 16FDC and 64FDC contained both single and double density data separators and the 64FDC also supplied write pre-compensation.An aftermarket add-on board, the FDCX4 Double Density Upgrade Board for the 4FDC, was designed and marketed by JVB Electronics. The FDCX4 was a daughter board assembly that replaced the WD1771 single density disk controller chip on the 4FDC with a FD1791 (early production) or Fujitsu MB8876A (later production) double-density controller chip. The FDCX4, in addition to using an analog phase-locked-loop data separator in all modes, also used write-precompensation. These features allowed the FDCX4 equipped 4FDC to reliably use the Persci 277 drives, as well as other drives, in double-density mode.".
- Cromemco_4FDC thumbnail Cromemco_4FDC.jpg?width=300.
- Cromemco_4FDC wikiPageExternalLink Cromemco%204FDC%20Disk%20Controller%201977.pdf.
- Cromemco_4FDC wikiPageExternalLink Cromemco%204FDC%20Manual%201977.pdf.
- Cromemco_4FDC wikiPageID "9402899".
- Cromemco_4FDC wikiPageLength "5297".
- Cromemco_4FDC wikiPageOutDegree "22".
- Cromemco_4FDC wikiPageRevisionID "606537807".
- Cromemco_4FDC wikiPageWikiLink Baud.
- Cromemco_4FDC wikiPageWikiLink Boot_monitor.
- Cromemco_4FDC wikiPageWikiLink Booting.
- Cromemco_4FDC wikiPageWikiLink Category:Floppy_disk_computer_storage.
- Cromemco_4FDC wikiPageWikiLink Computer_data_storage.
- Cromemco_4FDC wikiPageWikiLink Computer_storage.
- Cromemco_4FDC wikiPageWikiLink Cromemco.
- Cromemco_4FDC wikiPageWikiLink Disk_operating_system.
- Cromemco_4FDC wikiPageWikiLink Floppy-disk_controller.
- Cromemco_4FDC wikiPageWikiLink Floppy_Disk_Controller.
- Cromemco_4FDC wikiPageWikiLink Floppy_disk.
- Cromemco_4FDC wikiPageWikiLink IEEE_696.
- Cromemco_4FDC wikiPageWikiLink output.
- Cromemco_4FDC wikiPageWikiLink Kibibyte.
- Cromemco_4FDC wikiPageWikiLink RS-232.
- Cromemco_4FDC wikiPageWikiLink RS232.
- Cromemco_4FDC wikiPageWikiLink Read-only_memory.
- Cromemco_4FDC wikiPageWikiLink Resident_operating_system.
- Cromemco_4FDC wikiPageWikiLink S-100_bus.
- Cromemco_4FDC wikiPageWikiLink Serial_communication.
- Cromemco_4FDC wikiPageWikiLink Serial_communications.
- Cromemco_4FDC wikiPageWikiLink Stepper_motor.
- Cromemco_4FDC wikiPageWikiLink Transistor–transistor_logic.
- Cromemco_4FDC wikiPageWikiLink Voice_coil.
- Cromemco_4FDC wikiPageWikiLink Write_precompensation.
- Cromemco_4FDC wikiPageWikiLink File:Cromemco_4FDC.jpg.
- Cromemco_4FDC wikiPageWikiLink File:Cromemco_4FDC_color_adjusted.jpg.
- Cromemco_4FDC wikiPageWikiLinkText "Cromemco 4FDC".
- Cromemco_4FDC hasPhotoCollection Cromemco_4FDC.
- Cromemco_4FDC wikiPageUsesTemplate Template:Refimprove.
- Cromemco_4FDC subject Category:Floppy_disk_computer_storage.
- Cromemco_4FDC type Article.
- Cromemco_4FDC type Article.
- Cromemco_4FDC comment "The Cromemco 4FDC Floppy Disk Controller is designed to interface both 5.25- and 8.0-inch floppy disk drives to the S-100 computer bus used in Cromemco and other IEEE 696 computers. It also contains an RS232 serial I/O channel with software-selectable baud rates from 110 to 76,800. In addition, it has a 1 KB resident 2708 ROM containing Cromemco's RDOS, the resident disk operating system.The 4FDC was designed to drive Persci 277 8-inch single-density floppy drives.".
- Cromemco_4FDC label "Cromemco 4FDC".
- Cromemco_4FDC sameAs m.0287dqn.
- Cromemco_4FDC sameAs Q4638900.
- Cromemco_4FDC sameAs Q4638900.
- Cromemco_4FDC wasDerivedFrom Cromemco_4FDC?oldid=606537807.
- Cromemco_4FDC depiction Cromemco_4FDC.jpg.
- Cromemco_4FDC isPrimaryTopicOf Cromemco_4FDC.