About: Cromemco 4FDC

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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 disk operating system. The 4FDC was designed to drive Persci 277 8-inch single-density floppy drives. These drives were interesting in two respects:

Attributes	Values
rdfs:label	Cromemco 4FDC (en)
rdfs: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 disk operating system. The 4FDC was designed to drive Persci 277 8-inch single-density floppy drives. These drives were interesting in two respects: (en)
foaf:depiction
dcterms:subject	Cromemco Floppy disk computer storage
Wikipage page ID	9402899 (xsd:integer)
Wikipage revision ID	967402850 (xsd:integer)
Link from a Wikipage to another Wikipage	Read-only memory Voice coil Input/output Cromemco Cromemco DOS S-100 bus Cromemco Baud Stepper motor Disk operating system Floppy disk computer storage Floppy disk Floppy Disk Controller Kibibyte RS232 Transistor–transistor logic Write precompensation Computer storage Boot monitor IEEE 696 Serial communications dbr:Resident_operating_system
Link from a Wikipage to an external page	http://maben.homeip.net:8217/static/S100/cromemco/cards/Cromemco%204FDC%20Disk%20Controller%201977.pdf https://web.archive.org/web/20070928211735/http:/vt100.net/mirror/harte/Cromemco/Cromemco%204FDC%20Manual%201977.pdf
sameAs	Cromemco 4FDC Cromemco 4FDC Cromemco 4FDC
dbp:wikiPageUsesTemplate	dbt:Dead_link dbt:Refimprove
thumbnail	wiki-commons:Special:FilePath/Cromemco_4FDC_color_adjusted.jpg?width=300
bot	InternetArchiveBot (en)
date	August 2017 (en)
fix-attempted	yes (en)
has 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 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. (en)
prov:wasDerivedFrom	wikipedia-en:Cromemco_4FDC?oldid=967402850&ns=0
page length (characters) of wiki page	5418 (xsd:nonNegativeInteger)
foaf:isPrimaryTopicOf	wikipedia-en:Cromemco_4FDC
is Link from a Wikipage to another Wikipage of	Cromemco Cromemco 16FDC Cromemco 64FDC Cromemco RDOS 4FDC Floppy Disk Controller
is Wikipage redirect of	Cromemco 16FDC Cromemco 64FDC Cromemco RDOS 4FDC Floppy Disk Controller
is foaf:primaryTopic of	wikipedia-en:Cromemco_4FDC

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