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A cable could have 5.25-inch style connectors, 3.5-inch style connectors, or a combination. After IBM introduced the "twist" to floppy cables, and when both 5.25-inch and 3.5-inch drives were in common use, many cables had four connectors: one of each type before the twist, and one of each type after the twist.
Seagate ST506 5¼-inch HDD with cover removed 5.25 inch MFM hard disk drive. The ST-506 and ST-412 (sometimes written ST506 and ST412 [1]) were early hard disk drive products introduced by Seagate in 1980 and 1981 respectively, [1] that later became construed as hard disk drive interfaces: the ST-506 disk interface and the ST-412 disk interface.
The desktop computer hard-drive connector (AMP Mate-n-Lok 1-480424-0 power connector) is standard on all 5.25-inch floppy drives, 3.5-inch PATA and non-SCA SCSI disk drives; however, newer SATA disk drives employ a more advanced interconnection with 15 contacts. These advanced connection systems were first developed by Molex and other connector ...
The back of both LTEs feature ports for parallel communications, serial devices (RS-232, 9-pin), an external RGBI monitor, the optional external 5.25-inch floppy drive, and an optional external numeric keypad sold by Compaq. Yet another option was a 2,400 bit/s internal modem or a second serial port; both slot into the same option connector on ...
Micropolis boot diskette, as used with the Micropolis dual 5.25-inch drive to boot an IMSAI 8080.. Micropolis's first advance was to take the existing 48 tpi (tracks per inch) standard created by Shugart Associates, and double both the track density and track recording density to get four times the total storage on a 5.25-inch floppy in the "MetaFloppy" series with quad density (Drives :1054 ...
a floppy disk I/O card, which can control external 8" or 5.25" floppies, or a mixture of these, as configured by special external cables, and; a SCSI hard disk/floppy disk I/O card, which can control one external 8" hard drive and one to three external 8" floppy drives (these being either single- or double-sided, and either single- or double ...
When the controller and disk drive are assembled as one device, as it is the case with some external floppy disk drives, e.g., Commodore 1540 and USB floppy disk drives, [27] the internal floppy disk drive and its interface are unchanged, while the assembled device presents a different interface such as IEEE-488, parallel port or USB.
An external 5.25-inch floppy drive, matching the style of the IIc, was also made available. Later, 3.5-inch floppy storage became an option with the "intelligent" UniDisk 3.5 which contained its own miniature computer inside (CPU, RAM, firmware) to overcome the issue of using a high-speed floppy drive on a 1 MHz machine.
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