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Western Digital FD1772
The FD1771, sometimes WD1771, is a floppy disk controller chip, the first in a line of floppy disk controllers produced by Western Digital. It uses single density FM encoding introduced in the IBM 3740. Later models in the series added support for MFM encoding and increasingly added onboard circuitry that formerly had to be implemented in external components. Originally packaged as 40-pin dual in-line package (DIP) format,"The FD1771 is a single-chip floppy disk formatter/controller that interfaces with most available disk drives and virtually all types of computers." The FD1771 was announced on July 19, 1976, and sold for $60 each in lots of 100. later models moved to a 28-pin format that further lowered implementation costs. Derivatives The FD1771 was succeeded by many derivatives that were mostly software-compatible: *The FD1781 was designed for double density, but required external modulation and demodulation circuitry, so it could support MFM, M2FM, GCR or other double- ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
FD1771 FDC Datasheet
The FD1771, sometimes WD1771, is a floppy disk controller chip, the first in a line of floppy disk controllers produced by Western Digital. It uses single density FM encoding introduced in the IBM 3740. Later models in the series added support for MFM encoding and increasingly added onboard circuitry that formerly had to be implemented in external components. Originally packaged as 40-pin dual in-line package (DIP) format,"The FD1771 is a single-chip floppy disk formatter/controller that interfaces with most available disk drives and virtually all types of computers." The FD1771 was announced on July 19, 1976, and sold for $60 each in lots of 100. later models moved to a 28-pin format that further lowered implementation costs. Derivatives The FD1771 was succeeded by many derivatives that were mostly software-compatible: *The FD1781 was designed for double density, but required external modulation and demodulation circuitry, so it could support MFM, M2FM, GCR or other doub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Atari STE
Atari ST is a line of personal computers from Atari Corporation and the successor to the company's Atari 8-bit computers, 8-bit computers. The initial model, the Atari 520ST, had limited release in April–June 1985, and was widely available in July. It was the first personal computer with a bitmapped color graphical user interface, using a version of Digital Research's GEM (desktop environment), GEM environment from February 1985. The Atari 1040ST, released in 1986 with Megabyte, 1 MB of memory, was the first home computer with a cost per kilobyte of RAM under US$1/KB. After Jack Tramiel purchased the assets of the Atari, Inc. consumer division in 1984 to create Atari Corporation, the 520ST was designed in five months by a small team led by Shiraz Shivji. Alongside the Mac (computer), Macintosh, Amiga, Apple IIGS and Acorn Archimedes, the ST is part of a mid-1980s generation of computers with 16 or 16/32-bit processors, 256 kilobyte, KB or more of RAM, and computer m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Commodore 1581
The Commodore 1581 is a 3½-inch double-sided double-density floppy disk drive that was released by Commodore Business Machines (CBM) in 1987, primarily for its C64 and C128 home/personal computers. The drive stores 800 kilobytes using an MFM encoding but formats different from the MS-DOS (720 KB), Amiga (880 KB), and Mac Plus (800 KB) formats. With special software it's possible to read C1581 disks on an x86 PC system, and likewise, read MS-DOS and other formats of disks in the C1581 (using Big Blue Reader), provided that the PC or other floppy handles the size format. This capability was most frequently used to read MS-DOS disks. The drive was released in the summer of 1987 and quickly became popular with bulletin board system (BBS) operators and other users. Like the 1541 and 1571, the 1581 has an onboard MOS Technology 6502 CPU with its own ROM and RAM, and uses a serial version of the IEEE-488 interface. Inexplicably, the drive's ROM contains commands for parallel use ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Commodore 1571
The Commodore 1571 is Commodore's high-end 5¼" floppy disk drive, announced in the summer of 1985. With its double-sided drive mechanism, it has the ability to use double-sided, double-density (DS/DD) floppy disks, storing a total of 360 kB per floppy. It also implemented a "burst mode" that improved transfer speeds, helping address the very slow performance of previous Commodore drives. Earlier Commodore drives used a custom group coded recording format that stored 170 kB per side of a disk. This made it fairly competitive in terms of storage, but limited it to only reading and writing disks from other Commodore machines. The 1571 was designed to partner with the new Commodore 128 (C128), which introduced support for CP/M. Adding double-density MFM encoding allowed the drive to read and write contemporary CP/M disks (and many others). In contrast to its single-sided predecessors, the 1541 and the briefly-available 1570, the 1571 can use both sides of the disk ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ZX Spectrum
The ZX Spectrum () is an 8-bit computing, 8-bit home computer developed and marketed by Sinclair Research. One of the most influential computers ever made and one of the all-time bestselling British computers, over five million units were sold. It was released in the United Kingdom on 23 April 1982, and around the world in the following years, most notably in Europe and the United States. The machine was designed by English entrepreneur and inventor Sir Clive Sinclair and his small team in Cambridge, and was manufactured in Dundee, Scotland by Timex Corporation. It was made to be small, simple, and most importantly inexpensive, with as few components as possible. The addendum "Spectrum" was chosen to highlight the machine's colour display, which differed from the black-and-white display of its predecessor, the ZX81. Rick Dickinson designed its distinctive case, rainbow motif, and chiclet keyboard, rubber keyboard. Video output is transmitted to a television set rather than a ded ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
DISCiPLE
A disciple is a follower and student of a mentor, teacher, or other figure. It can refer to: Religion * Disciple (Christianity), a student of Jesus Christ * Twelve Apostles of Jesus, sometimes called the Twelve Disciples * Seventy disciples in the Gospel of Luke * Christian Church (Disciples of Christ), a mainline Protestant denomination in the United States and Canada with roots in the Restoration Movement often referred to as "the Disciples" * Disciples of Christ (Campbell Movement), a movement founded by Alexander and Thomas Campbell in 1809 which merged with the Christians (Stone Movement) in 1832 to form the Restoration Movement * Disciples of `Abdu'l-Bahá, 19 Western Bahá'ís * The ten principal disciples of Buddha * Disciples of Confucius * Disciples of Jesus in Islam * Student of Kriya Yoga, of direct lineage to Mahavatar Babaji * Sahabah, the disciples of Muhammad * Follower of Paramahansa Yogananda * Śishya, the disciple in the Guru–shishya tradition of Hinduism * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
SAM Coupé
The SAM Coupé (pronounced /sæm ku:peɪ/ from its original British English branding) is an 8-bit British home computer manufactured by '' Miles Gordon Technology'' (''MGT''), based in Swansea in the United Kingdom and released in December 1989. It was based on and designed to have a compatibility mode with the ZX Spectrum 48K with influences from the Loki project and marketed as a logical upgrade from the Spectrum with increased memory, graphical and sound capabilities, native peripheral support (floppy disk, MIDI, joystick, light pen/light gun and a proprietary mouse). The inclusion of support for higher graphical modes allowed for 80-column text presentation, providing a platform to support productivity and CP/M applications via additional software. Being based on 8-bit technology at a time when 16-bit home computers were more prevalent, coupled with a lack of commercial software titles, led to it being a commercial failure. When ''MGT'' went into receivership in June 1990 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acorn Archimedes
The Acorn Archimedes is a family of personal computers designed by Acorn Computers of Cambridge, England. The systems in this family use Acorn's own ARM architecture processors and initially ran the Arthur operating system, with later models introducing RISC OS and, in a separate workstation range, RISC iX. The first Archimedes models were introduced in 1987, and systems in the Archimedes family were sold until the mid-1990s alongside Acorn's newer Risc PC and A7000 models. The first Archimedes models, featuring a 32-bit ARM2 RISC CPU running at 8 MHz, provided a significant upgrade from Acorn's previous machines and 8-bit home computers in general. Acorn's publicity claimed a performance rating of 4 MIPS.These being equivalent to VAX-11/750 instructions. Later models featured the ARM3 CPU, delivering a substantial performance improvement, and the first ARM system-on-a-chip, the ARM250. The Archimedes preserves a degree of compatibility with Acorn's earlier m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Atari ST
Atari ST is a line of personal computers from Atari Corporation and the successor to the company's Atari 8-bit computers, 8-bit computers. The initial model, the Atari 520ST, had limited release in April–June 1985, and was widely available in July. It was the first personal computer with a bitmapped color graphical user interface, using a version of Digital Research's GEM (desktop environment), GEM environment from February 1985. The Atari 1040ST, released in 1986 with Megabyte, 1 MB of memory, was the first home computer with a cost per kilobyte of RAM under US$1/KB. After Jack Tramiel purchased the assets of the Atari, Inc. consumer division in 1984 to create Atari Corporation, the 520ST was designed in five months by a small team led by Shiraz Shivji. Alongside the Mac (computer), Macintosh, Amiga, Apple IIGS and Acorn Archimedes, the ST is part of a mid-1980s generation of computers with 16 or 16/32-bit processors, 256 kilobyte, KB or more of RAM, and computer m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
BBC Master
The BBC Master is a home computer released by Acorn Computers in early 1986. It was designed and built for the BBC, British Broadcasting Corporation (BBC) and was the successor to the BBC Micro, BBC Micro Model B. The Master 128 remained in production until 1993. Design The Master series featured several improvements over earlier BBC Micro models. Rather than the MOS Technology 6502 Central processing unit, microprocessor used by the BBC Micro, Model B, Master series models used the slightly improved WDC 65C02, 65C12. Fabricated using CMOS technology, the 65C12 used less power than the 6502 and offered somewhat better performance, reportedly "almost as fast" as the original 3 MHz 6502 second processor for the BBC Micro. The systems had of dynamic RAM as standard, alleviating the shortage of available RAM which had previously discouraged use of the display modes offering the highest quality graphics on earlier models. Of the total 128 KB of RAM, 64 KB was provid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acorn Electron
The Acorn Electron (nicknamed the Elk inside Acorn and beyond) was introduced as a lower-cost alternative to the BBC Micro educational/home computer, also developed by Acorn Computers, to provide many of the features of that more expensive machine at a price more competitive with that of the ZX Spectrum. It has 32 kilobytes of random-access memory, RAM, and its read-only memory, ROM includes BBC BASIC II together with the Acorn MOS, operating system. Announced in 1982 for a possible release the same year, it was eventually introduced on 25 August 1983 priced at £199. The Electron is able to save and load programs onto compact audio cassette, audio cassette via a cable, originally supplied with the computer, connecting it to any standard tape recorder with the appropriate sockets. It is capable of bitmapped graphics, and can use either a contemporary television set, a colour (RGB) monitor or a monochrome monitor as its display. Several expansions were made available to provide m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
TRS-80
The TRS-80 Micro Computer System (TRS-80, later renamed the Model I to distinguish it from successors) is a desktop microcomputer developed by American company Tandy Corporation and sold through their Radio Shack stores. Launched in 1977, it is one of the earliest mass-produced and mass-marketed retail home computers. The name is an abbreviation of ''Tandy Radio Shack, Z80 [microprocessor]'', referring to its Zilog Z80 8-bit microprocessor. The TRS-80 has a full-stroke QWERTY keyboard, 4 kilobyte, KB dynamic random-access memory (DRAM) standard memory, small size and desk area, floating-point Level I BASIC language Interpreter (computing), interpreter in read-only memory (ROM), 64-character-per-line computer monitor, video monitor, and had a starting price of US$600 (equivalent to US$ in ). A cassette tape drive for program storage was included in the original package. While the software environment was stable, the cassette load/save process combined with keyboard bounce issues ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
