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IBM ThinkPad 755
The ThinkPad 755 is a series of high-end notebook-sized laptop A laptop computer or notebook computer, also known as a laptop or notebook, is a small, portable personal computer (PC). Laptops typically have a Clamshell design, clamshell form factor (design), form factor with a flat-panel computer scree ...s released by IBM from 1994 to 1996. All models in the line feature either the i486 processor or the Pentium (original), original Pentium processor by Intel, clocked between 50 and 100 MHz. The ThinkPad 755CD, introduced in October 1994, was the first notebook on the market with an internal full-sized CD-ROM drive. The ThinkPad 755 series was the top-selling laptop for much of 1994, beating out competition from Apple Inc., Apple Computer and Compaq. IBM replaced it with the IBM ThinkPad 760, ThinkPad 760 series in January 1996. Development and specifications ThinkPad 755C and 755Cs IBM announced the ThinkPad 755 series in April 1994 and released it the following mon ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Docking Station
In computing, a docking station, port replicator (hub), or dock provides a simplified way to ''plug-in'' a mobile device, such as connect common peripherals to a laptop, or charge a smartphone. Because a wide range of dockable devices—from mobile phones to wireless mouse—have different connectors, power signaling, and uses, docks are unstandardized and are therefore often designed for a specific type of device. A dock can allow some laptop computers to become a substitute for a desktop computer, without sacrificing the mobile computing functionality of the machine. Portable computers can dock and undock hot, cold or standby, depending on the abilities of the system. In a cold dock or undock, one completely shuts the computer down before docking/undocking. In a hot dock or undock, the computer remains running when docked/undocked. Standby docking or undocking, an intermediate style used in some designs, allows the computer to be docked/undocked while powered on, but requir ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Clock Speed
Clock rate or clock speed in computing typically refers to the frequency at which the clock generator of a processor can generate pulses used to synchronize the operations of its components. It is used as an indicator of the processor's speed. Clock rate is measured in the SI unit of frequency hertz (Hz). The clock rate of the first generation of computers was measured in hertz or kilohertz (kHz), the first personal computers from the 1970s through the 1980s had clock rates measured in megahertz (MHz). In the 21st century the speed of modern CPUs is commonly advertised in gigahertz (GHz). This metric is most useful when comparing processors within the same family, holding constant other features that may affect performance. Determining factors Binning Manufacturers of modern processors typically charge higher prices for processors that operate at higher clock rates, a practice called binning. For a given CPU, the clock rates are determined at the end of the manufac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crystal Semiconductor
Crystal Semiconductor Corporation was an American computer company based in Austin, Texas, and active from 1984 to the early 2000s. Founded by Michael J. Callahan and James H. Clardy, the company originally specialized in the design and manufacture of silicon for mixed-signal integrated circuits, namely digital-to-analog (DAC) and analog-to-digital (ADC) converters. After being acquired by Cirrus Logic of San Jose, California, in 1991 for about $59 million, the company became a dominant player in the personal computer sound chip market. History Independent era (1984–1991) Crystal Semiconductor Corporation was incorporated in 1984 by Michael J. Callahan and James H. Clardy in Austin, Texas. Callahan, the principal founder, had previously incorporated Texas Micro Engineering (TME), a fabless semiconductor firm, in Austin in 1979. Clardy meanwhile was a 21-year veteran designer at Texas Instruments before co-founding Crystal. Immediately after forming Crystal, Callahan transfe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sound Chip
A sound chip is an integrated circuit (chip) designed to produce audio signals through digital, analog or mixed-mode electronics. Sound chips are typically fabricated on metal–oxide–semiconductor (MOS) mixed-signal chips that process audio signals ( analog and digital signals, for both analog and digital data). They normally contain audio components such as oscillators, envelope controllers, samplers, filters, amplifiers, and envelope generators. History A number of sound synthesis methods for electronically producing sound were devised during the late 20th century. These include programmable sound generators (PSG), wavetable synthesis, and frequency modulation synthesis (FM synthesis). Such sound chips were widely used in arcade game system boards, video game consoles, home computers and digital synthesizers. Since the late-1990s, pulse-code modulation (PCM) sampling has been the standard for many sound chips, as used in the Intel High Definition Audio (IHD ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ThinkPad UltraBay
UltraBay is originally IBM's name for the swappable drive bay in the ThinkPad range of laptop computers. When the ThinkPad product line was sold to Lenovo, the concept and the name stayed. It is also used in some of Lenovo's own IdeaPad Y Series laptops. Introduced with the ThinkPad 750 series in 1995, this technology has gone through redesigns with almost every new generation of ThinkPad, which may lead to confusion. The following table gives an overview of the different UltraBay types, in which models they occurred and which drives are available for them. Note that the optical drive bay in G series and R40e series ThinkPads is not an UltraBay in that the drives are fixed and not removable. It is however, mechanically, an UltraBay 2000-device without the surrounding "caddy". On the media side different UltraBays relate to the form factor of the drives they accept; Some machines can accept UltraBay devices up to 12.5 mm thick, whereas others are limited to devices no more t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mini CD
Mini CDs, or pocket CDs, are CDs with a smaller diameter and one-third the storage capacity of a standard 120 mm disc. Formats Amongst the various formats are the * Mini CD single, a small disc. The format is mainly used for audio CD singles in certain regions (singles are sold on normal 120 mm CDs in many countries), much like the old vinyl single. An 80 mm disc can hold up to 24 minutes of music, or 210 MiB (210 × 220 bytes) of data. They are often referred to as ''Maxi CDs'' in some countries. **The low density version holds 18 minutes, or 155 MB. **Other formats are 185 MB (21 mins), which has the same data density as a 650 MB full-sized CD, and 210 MB (24 mins), with the same data density as a 700 MB full-sized CD, used for "Pocket" data storage. (see also miniDVD) * Business card CD (or "b-card"), a truncated (to the shape and size of a business card) disc with a storage capacity from 30 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Panasonic CF-V21P
The CF-V21P is a notebook-sized laptop released by Panasonic in 1993. It was the first notebook computer to have an integrated CD-ROM drive as an option, albeit it only supports up to 3.5-inch-diameter mini CDs instead of standard 4.7-inch-diameter discs. It was discontinued in 1994. Specifications On its release in October 1993, the stock CF-V21P featured an Intel i486SX microprocessor clocked at 25 MHz, initially upgradable to a 50-MHz i486DX2. Later, the company made the i486DX4 clocked at 75 MHz available as a processor upgrade. The stock amount of RAM on the motherboard is 4 MB, expandable to up to 20 MB with aftermarket RAM cards. The notebook was sold with either 80 MB or 120 MB internal hard disk drives, with a 450 MB drive later made an option on the high-end. For a pointing device, Panasonic built the CF-V21P with a trackball positioned at the center of the palm rest, with the left- and right-click buttons to either side of it. For s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Panasonic
is a Japanese multinational electronics manufacturer, headquartered in Kadoma, Osaka, Kadoma, Japan. It was founded in 1918 as in Fukushima-ku, Osaka, Fukushima by Kōnosuke Matsushita. The company was incorporated in 1935 and renamed and changed its name to in 2008. In 2022, it reorganized as a holding company and adopted its current name. In addition to consumer electronics, for which it was the world’s largest manufacturer in the late 20th century, Panasonic produces a wide range of products and services, including Rechargeable battery, rechargeable batteries, automotive and avionic systems, industrial equipment, as well as home renovation and construction. The company is listed on the Tokyo Stock Exchange and is a constituent of the Nikkei 225 and TOPIX, TOPIX 100 indices, with a secondary listing on the Nagoya Stock Exchange. Corporate name From 1925 to October 1, 2008, the company's corporate name was "Matsushita Electric Industrial Co." (MEI). On January 10, 2008, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Floppy Disk Drive
A floppy disk or floppy diskette (casually referred to as a floppy, a diskette, or a disk) is a 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. The three most popular (and commercially available) floppy disks are the 8-inch, 5¼-inch, and 3½-inch floppy disks. 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 in 1971, had a disk diameter of . Subsequently, the 5¼-inch (133.35 mm) and then the 3½-inch (88.9 mm) 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 Floppy disk variants, other-size fl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hard Disk Drive
A hard disk drive (HDD), hard disk, hard drive, or fixed disk is an electro-mechanical data storage device that stores and retrieves digital data using magnetic storage with one or more rigid rapidly rotating hard disk drive platter, platters coated with magnetic material. The platters are paired with disk read-and-write head, magnetic heads, usually arranged on a moving actuator arm, which read and write data to the platter surfaces. Data is accessed in a random-access manner, meaning that individual Block (data storage), blocks of data can be stored and retrieved in any order. HDDs are a type of non-volatile storage, retaining stored data when powered off. Modern HDDs are typically in the form of a small disk enclosure, rectangular box. Hard disk drives were introduced by IBM in 1956, and were the dominant secondary storage device for History of general-purpose CPUs, general-purpose computers beginning in the early 1960s. HDDs maintained this position into the modern er ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Super-twisted Nematic Display
An STN (super-twisted nematic) display is a type of liquid-crystal display (LCD). An LCD is a flat-panel display that uses liquid crystals to change its properties when exposed to an electric field, which can be used to create images. This change is called the twisted nematic (TN) field effect. Earlier TN displays twisted the liquid crystal molecules at a 90-degree angle. STN displays improved on that by twisting the liquid crystal molecules at a much greater angle, typically between 180 and 270 degrees. This allows for a sharper image and passive matrix addressing, a simpler way to control the pixels in an LCD. While STN displays were once common in various electronic devices, they have been largely replaced by TFT (thin-film transistor) displays. Development In 1982, C. M. Waters and E. P. Raynes patented STN displays, and by 1984 researchers at Brown Boveri (later ABB) built the first prototype STN matrix display, with 540 × 270 pixels. A key challenge was finding a w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Passive Matrix Addressing
Passive matrix addressing is an Display addressing scheme, addressing scheme used in early liquid crystal displays, liquid crystal displays (LCDs). It is a matrix addressing scheme, meaning that only ''m'' + ''n'' control signals are required to address an ''m'' × ''n'' display. A pixel in a passive matrix must maintain its state without active driving circuitry until it can be refreshed again. The Wiktionary:signal, signal is divided into a row or ''select signal'' and a column or ''video signal''. The select voltage determines the row that is being addressed and all ''n'' pixels on a row are addressed simultaneously. When pixels on a row are being addressed, a ''Vsel'' potential is applied, and all other rows are unselected with a ''Vunsel'' potential. The video signal or column potential is then applied with a potential for each ''m'' columns individually. An on-switched (lit) pixel corresponds to a ''Von'', an off-switched (unlit) corresponds to a ''Vof ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
