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List Of Floppy Disk Formats
This is a list of different floppy disk formats. IBM 8-inch formats This is a list of 8-inch floppy diskette formats as introduced by IBM. DEC 8-inch formats Digital Equipment Corporation used the following formats on 8-inch disks: Other manufacturers Physical composition Logical formats Throughout the 1970s and 1980s, many different logical disk formats were used, depending on the hardware platform. Ref. https://www.trs-80.com/wordpress/trs-80-computer-line/model-i/ https://www.trs-80.com/wordpress/trs-80-computer-line/model-ii/ https://www.trs-80.com/wordpress/trs-80-computer-line/model-4/ See also * Zip drive The Zip drive is a removable floppy disk storage system that was introduced by Iomega in late 1994. Considered medium-to-high-capacity at the time of its release, Zip disks were originally launched with capacities of 100 MB, then 250 ... (floppy-like, but incompatible medium using different technology) * PocketZip (floppy-like, bu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Floppy Disk 2009 G1
A floppy disk or floppy diskette (casually referred to as a floppy, or a diskette) is an obsolescent type of disk storage composed of a thin and flexible disk of a magnetic storage medium in a square or nearly square plastic enclosure lined with a fabric that removes dust particles from the spinning disk. Floppy disks store digital data which can be read and written when the disk is inserted into a floppy disk drive (FDD) connected to or inside a computer or other device. The first floppy disks, invented and made by IBM, had a disk diameter of . Subsequently, the 5¼-inch and then the 3½-inch became a ubiquitous form of data storage and transfer into the first years of the 21st century. 3½-inch floppy disks can still be used with an external USB floppy disk drive. USB drives for 5¼-inch, 8-inch, and other-size floppy disks are rare to non-existent. Some individuals and organizations continue to use older equipment to read or transfer data from floppy disks. Floppy disks ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zenith Minisport
The Zenith MinisPort (styled as minisPORT) is a subnotebook based on an 80C88 CMOS CPU running at two software selectable speeds: 4.77 MHz or 8 MHz. It was released in 1989 by Zenith Data Systems (ZDS). It had 1 (model ZL-1) or 2 MB (model ZL-2) of RAM, ran MS-DOS 3.3 Plus from ROM, had a 640×200 LCD display and CGA and composite monochrome outputs. The MinisPort was one of the first actual subnotebooks, apart from a contemporary NEC model. Features * Internal 2-inch "LT" floppy disk drive (793 KB formatted, double-sided, double-density, 80 tracks, 245 tpi, media: Fujifilm LT-1). The floppy disks typically cost $80 for ten of them. The disks were not compatible with two-inch "VF" video floppy diskettes. * An external standard 3.5-inch 720 KB double-density floppy drive was available as well. * Built-in ''FastLynx'' transfer software that could install itself on any other DOS computer over a serial cable without the need for any pre-exist ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Agat (computer)
The Agat (russian: Агат) was a series of 8-bit computers produced in the Soviet Union. It used the same MOS Technology 6502 microprocessor as Apple II. Commissioned by the USSR Ministry of Radio, for many years it was a popular microcomputer in Soviet schools. First introduced at a Moscow trade fair in 1983, the Agat was primarily produced between 1984 and 1990, although a limited number of units may have been manufactured as late as 1993. By 1988, about 12,000 units were produced, over 9 months of 1989 — about 7,000. Architecture and design The Agat was inspired primarily by Apple II, though being largely different from it in design. A domestically produced "partitioned 588 series" CPU was used on early pre-production series, which simulated the MOS Technology 6502 microprocessor instruction set. While this permitted some degree of compatibility with the Apple, timing differences between the two CPUs rendered certain tasks (such as floppy disk access and sound generation) i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acorn Computers
Acorn Computers Ltd. was a British computer company established in Cambridge, England, in 1978. The company produced a number of computers which were especially popular in the UK, including the Acorn Electron and the Acorn Archimedes. Acorn's computer dominated the UK educational computer market during the 1980s. Though the company was acquired and largely dismantled in early 1999, with various activities being dispersed amongst new and established companies, its legacy includes the development of reduced instruction set computing (RISC) personal computers. One of its operating systems, , continues to be developed by RISC OS Open. Some activities established by Acorn lived on: technology developed by Arm, created by Acorn as a joint venture with Apple and VLSI in 1990, is dominant in the mobile phone and personal digital assistant (PDA) microprocessor market. Acorn is sometimes referred to as the "British Apple" and has been compared to Fairchild Semiconductor for bei ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Micropolis (company)
Micropolis Corporation (styled as ''MICROPΩLIS'') was a disk drive company located in Chatsworth, California and founded in 1976. Micropolis initially manufactured high capacity (for the time) hard-sectored 5.25-inch floppy drives and controllers, later manufacturing hard drives using SCSI and ESDI interfaces. History 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'', '':1053'', and '':1043'') around 1980. Micropolis pioneered 100 tpi density because of the attraction of an exact 100 tracks to the inch. "Micropolis-compatible" 5.25-inch 77-track diskette drives were also manufactured by Tandon (TM100-3M and TM100-4M). Such drives were used in a number of computers like in a Vector Graphic S-100 bus computer, the Durango ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Apple FileWare
FileWare floppy disk drives and diskettes were designed by Apple Computer as a higher-performance alternative to the Disk II and Disk III floppy systems used on the Apple II and Apple III personal computers. The drives are named Apple 871 in service documentation, based on their approximate formatted storage capacity in kilobytes, but are most commonly known by their codename, Twiggy, after the famously thin 1960s fashion model named Twiggy. History In 1978, Apple intended to develop its own FileWare drive mechanism for use in the new Apple III and Apple Lisa business computers being developed. They quickly ran into difficulties which precluded them from being incorporated in the Apple III, which continued to use the earlier Shugart design. Finally, FileWare drives were implemented in the Lisa computer, released on January 19, 1983. The original Macintosh computer was originally intended to implement a Shugart drive, then later, a FileWare drive, before eventually shipping w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coercivity
Coercivity, also called the magnetic coercivity, coercive field or coercive force, is a measure of the ability of a ferromagnetic material to withstand an external magnetic field without becoming demagnetized. Coercivity is usually measured in oersted or ampere/meter units and is denoted . An analogous property in electrical engineering and materials science, electric coercivity, is the ability of a ferroelectric material to withstand an external electric field without becoming depolarized. Ferromagnetic materials with high coercivity are called magnetically ''hard'', and are used to make permanent magnets. Materials with low coercivity are said to be magnetically ''soft''. The latter are used in transformer and inductor cores, recording heads, microwave devices, and magnetic shielding. Definitions Coercivity in a ferromagnetic material is the intensity of the applied magnetic field (''H'' field) required to demagnetize that material, after the magnetization of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
To Be Confirmed
To be announced (TBA), to be confirmed (TBC), to be determined or decided or declared (TBD), and other variations, are placeholder terms used very broadly in event planning to indicate that although something is scheduled or expected to happen, a particular aspect of that remains to be fixed or set. TBA versus TBC versus TBD These phrases are similar, but may be used for different degrees of indeterminacy: *To be announced (TBA) or to be declared (TBD) – details may have been determined, but are not yet ready to be announced. *To be confirmed (TBC), to be resolved (TBR), or to be provided (TBP) – details may have been determined and possibly announced, but are still subject to change prior to being finalized. *To be arranged, to be agreed (TBA), to be determined (TBD) or to be decided – the appropriateness, feasibility, location, etc. of a given event has not been decided. Other similar phrases sometimes used to convey the same meaning, and using the same abbreviations, inc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ultimate Capacity And Speed
Ultimate or Ultimates may refer to: Arts, entertainment, and media Music Albums * ''Ultimate'' (Jolin Tsai album) * ''Ultimate'' (Pet Shop Boys album) *''Ultimate!'', an album by The Yardbirds *'' The Ultimate (Bryan Adams Album)'', a compilation album by Bryan Adams *''Ultimate Prince'' or just Ultimate, an album by Prince Songs * "Ultimate" (Denzel Curry song), a song by Denzel Curry from the double EP 32 Zel/Planet Shrooms *"Ultimate", a song by Lindsay Lohan from the ''Freaky Friday'' soundtrack Video games *''Super Smash Bros. Ultimate'', often referred to as simply ''Ultimate''. *''Ultimate General'', a series of computer games recreating the American Civil War *Ultimate Play the Game or just Ultimate, a video game developer, now known as Rare Other uses in arts, entertainment, and media *Ultimate (roller coaster), at Lightwater Valley amusement park near Ripon, North Yorkshire, England *Ultimates, a fictional superhero group in the Marvel Comics universe Philosophy *T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mebibyte
The byte is a unit of digital information that most commonly consists of eight bits. Historically, the byte was the number of bits used to encode a single character of text in a computer and for this reason it is the smallest addressable unit of memory in many computer architectures. To disambiguate arbitrarily sized bytes from the common 8-bit definition, network protocol documents such as The Internet Protocol () refer to an 8-bit byte as an octet. Those bits in an octet are usually counted with numbering from 0 to 7 or 7 to 0 depending on the bit endianness. The first bit is number 0, making the eighth bit number 7. The size of the byte has historically been hardware-dependent and no definitive standards existed that mandated the size. Sizes from 1 to 48 bits have been used. The six-bit character code was an often-used implementation in early encoding systems, and computers using six-bit and nine-bit bytes were common in the 1960s. These systems often had memory word ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
LS-240
The SuperDisk LS-120 is a high-speed, high-capacity alternative to the 90 mm (3.5 in), 1.44 MB floppy disk. The SuperDisk hardware was created by 3M's storage products group Imation in 1997, with manufacturing chiefly by Matsushita. The SuperDisk had little success in North America; with Compaq, Gateway and Dell being three of only a few OEMs who supported it. It was more successful in Asia and Australia, where the second-generation SuperDisk LS-240 drive and disk was released. SuperDisk worldwide ceased manufacturing in 2003. History The design of the SuperDisk system came from an early 1990s project at Iomega. It is one of the last examples of floptical technology, where lasers are used to guide a magnetic head which is much smaller than those used in traditional floppy disk drives. Iomega orphaned the project around the time they decided to release the Zip drive in 1994. The idea eventually ended up at 3M, where the concept was refined and the desi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
HiFD
The Sony HiFD (High capacity Floppy Disk) was a high-capacity floppy disk system developed by Sony and Fujifilm and introduced in late 1998. Development and sale of the drives was discontinued by early 2001. Announced in October 1997, HiFD disks offered a capacity of 200 MB while maintaining backwards compatibility with standard 720 KB and 1.44 MB diskettes. Sony initially planned to begin shipping the drives in the first half of 1998, however, the introduction was delayed until the end of the year. TEAC and Alps also planned to introduce HiFD drives. The first drives to reach the public were external parallel port models priced at $199. An internal ATA version was later offered, with a SCSI version planned but never launched. IBM offered an internal HiFD drive as an option on some of its workstations in 2000. Its immediate competitors were the popular Iomega Zip drive, which had a capacity of 100 MB and Imation's Laser-Servo LS-120 SuperDisk, which had a c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
