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By , Engelbart had already established a research lab at SRI, the Augmentation Research Center ARC , to pursue his objective of developing both hardware and software computer technology to "augment" human intelligence.

That November, while attending a conference on computer graphics in Reno, Nevada , Engelbart began to ponder how to adapt the underlying principles of the planimeter to inputting X- and Y-coordinate data.

Engelbart never received any royalties for it, as his employer SRI held the patent, which expired before the mouse became widely used in personal computers.

On October 2, , a mouse device named Rollkugel German for "rolling ball" was described as an optional device for its SIG terminal. It was developed by the German company Telefunken.

It was based on an earlier trackball-like device also named Rollkugel that was embedded into radar flight control desks.

Together with light pens and trackballs, it was offered as an optional input device for their system since Some Rollkugel mouses installed at the Leibniz-Rechenzentrum in Munich in are well preserved in a museum.

The Xerox Alto was one of the first computers designed for individual use in and is regarded as the first modern computer to utilize a mouse. The third marketed version of an integrated mouse shipped as a part of a computer and intended for personal computer navigation came with the Xerox Star in By , the Xerox was probably the best-known computer with a mouse.

The Sun-1 also came with a mouse, and the forthcoming Apple Lisa was rumored to use one, but the peripheral remained obscure; Jack Hawley of The Mouse House reported that one buyer for a large organization believed at first that his company sold lab mice.

Microsoft's mouse shipped in , thus beginning the Microsoft Hardware division of the company. A mouse typically controls the motion of a pointer in two dimensions in a graphical user interface GUI.

The mouse turns movements of the hand backward and forward, left and right into equivalent electronic signals that in turn are used to move the pointer.

The relative movements of the mouse on the surface are applied to the position of the pointer on the screen, which signals the point where actions of the user take place, so hand movements are replicated by the pointer.

For example, a text file might be represented by a picture of a paper notebook and clicking while the cursor hovers this icon might cause a text editing program to open the file in a window.

Different ways of operating the mouse cause specific things to happen in the GUI: [38]. Users can also employ mice gesturally ; meaning that a stylized motion of the mouse cursor itself, called a " gesture ", can issue a command or map to a specific action.

For example, in a drawing program, moving the mouse in a rapid "x" motion over a shape might delete the shape. Gestural interfaces occur more rarely than plain pointing-and-clicking; and people often find them more difficult to use, because they require finer motor control from the user.

However, a few gestural conventions have become widespread, including the drag and drop gesture, in which:. For example, a user might drag-and-drop a picture representing a file onto a picture of a trash can , thus instructing the system to delete the file.

Other uses of the mouse's input occur commonly in special application-domains. In interactive three-dimensional graphics , the mouse's motion often translates directly into changes in the virtual objects' or camera's orientation.

For example, in the first-person shooter genre of games see below , players usually employ the mouse to control the direction in which the virtual player's "head" faces: moving the mouse up will cause the player to look up, revealing the view above the player's head.

A related function makes an image of an object rotate, so that all sides can be examined. When mice have more than one button, the software may assign different functions to each button.

Often, the primary leftmost in a right-handed configuration button on the mouse will select items, and the secondary rightmost in a right-handed button will bring up a menu of alternative actions applicable to that item.

For example, on platforms with more than one button, the Mozilla web browser will follow a link in response to a primary button click, will bring up a contextual menu of alternative actions for that link in response to a secondary-button click, and will often open the link in a new tab or window in response to a click with the tertiary middle mouse button.

The German company Telefunken published on their early ball mouse on 2 October The ball mouse replaced the external wheels with a single ball that could rotate in any direction.

It came as part of the hardware package of the Xerox Alto computer. Perpendicular chopper wheels housed inside the mouse's body chopped beams of light on the way to light sensors, thus detecting in their turn the motion of the ball.

This variant of the mouse resembled an inverted trackball and became the predominant form used with personal computers throughout the s and s.

The Xerox PARC group also settled on the modern technique of using both hands to type on a full-size keyboard and grabbing the mouse when required.

The ball mouse has two freely rotating rollers. These are located 90 degrees apart. One roller detects the forward—backward motion of the mouse and other the left—right motion.

Opposite the two rollers is a third one white, in the photo, at 45 degrees that is spring-loaded to push the ball against the other two rollers.

Each roller is on the same shaft as an encoder wheel that has slotted edges; the slots interrupt infrared light beams to generate electrical pulses that represent wheel movement.

Each wheel's disc has a pair of light beams, located so that a given beam becomes interrupted or again starts to pass light freely when the other beam of the pair is about halfway between changes.

Simple logic circuits interpret the relative timing to indicate which direction the wheel is rotating. This incremental rotary encoder scheme is sometimes called quadrature encoding of the wheel rotation, as the two optical sensors produce signals that are in approximately quadrature phase.

The mouse sends these signals to the computer system via the mouse cable, directly as logic signals in very old mice such as the Xerox mice, and via a data-formatting IC in modern mice.

The driver software in the system converts the signals into motion of the mouse cursor along X and Y axes on the computer screen. The ball is mostly steel, with a precision spherical rubber surface.

The weight of the ball, given an appropriate working surface under the mouse, provides a reliable grip so the mouse's movement is transmitted accurately.

Key Tronic later produced a similar product. Another type of mechanical mouse, the "analog mouse" now generally regarded as obsolete , uses potentiometers rather than encoder wheels, and is typically designed to be plug compatible with an analog joystick.

The "Color Mouse", originally marketed by RadioShack for their Color Computer but also usable on MS-DOS machines equipped with analog joystick ports, provided the software accepted joystick input was the best-known example.

Early optical mice relied entirely on one or more light-emitting diodes LEDs and an imaging array of photodiodes to detect movement relative to the underlying surface, eschewing the internal moving parts a mechanical mouse uses in addition to its optics.

A laser mouse is an optical mouse that uses coherent laser light. The earliest optical mice detected movement on pre-printed mousepad surfaces, whereas the modern LED optical mouse works on most opaque diffuse surfaces; it is usually unable to detect movement on specular surfaces like polished stone.

Laser diodes provide good resolution and precision, improving performance on opaque specular surfaces. Later, more surface-independent optical mice use an optoelectronic sensor essentially, a tiny low-resolution video camera to take successive images of the surface on which the mouse operates.

Battery powered, wireless optical mice flash the LED intermittently to save power, and only glow steadily when movement is detected.

Often called "air mice" since they do not require a surface to operate, inertial mice use a tuning fork or other accelerometer US Patent [50] to detect rotary movement for every axis supported.

The most common models manufactured by Logitech and Gyration work using 2 degrees of rotational freedom and are insensitive to spatial translation.

The user requires only small wrist rotations to move the cursor, reducing user fatigue or " gorilla arm ".

Usually cordless, they often have a switch to deactivate the movement circuitry between use, allowing the user freedom of movement without affecting the cursor position.

A patent for an inertial mouse claims that such mice consume less power than optically based mice, and offer increased sensitivity, reduced weight and increased ease-of-use.

Also known as bats, [52] flying mice, or wands, [53] these devices generally function through ultrasound and provide at least three degrees of freedom.

Probably the best known example would be 3Dconnexion " Logitech 's SpaceMouse" from the early s.

In the late s Kantek introduced the 3D RingMouse. This wireless mouse was worn on a ring around a finger, which enabled the thumb to access three buttons.

The mouse was tracked in three dimensions by a base station. One example of a s consumer 3D pointing device is the Wii Remote. While primarily a motion-sensing device that is, it can determine its orientation and direction of movement , Wii Remote can also detect its spatial position by comparing the distance and position of the lights from the IR emitter using its integrated IR camera since the nunchuk accessory lacks a camera, it can only tell its current heading and orientation.

The obvious drawback to this approach is that it can only produce spatial coordinates while its camera can see the sensor bar. More accurate consumer devices have since been released, including the PlayStation Move , the Razer Hydra and the controllers part of the HTC Vive virtual reality system.

All of these devices can accurately detect position and orientation in 3D space regardless of angle relative to the sensor station. A mouse-related controller called the SpaceBall [55] has a ball placed above the work surface that can easily be gripped.

With spring-loaded centering, it sends both translational as well as angular displacements on all six axes, in both directions for each. This new concept of a true six degree-of-freedom input device uses a ball to rotate in 3 axes without any limitations.

Logitech spacemouse 3D. Silicon Graphics SpaceBall model , allowing manipulation of objects with six degrees of freedom. In , Logitech introduced a "tactile mouse" that contained a small actuator to make the mouse vibrate.

Such a mouse can augment user-interfaces with haptic feedback, such as giving feedback when crossing a window boundary. To surf by touch requires the user to be able to feel depth or hardness; this ability was realized with the first electrorheological tactile mice [57] but never marketed.

Tablet digitizers are sometimes used with accessories called pucks, devices which rely on absolute positioning, but can be configured for sufficiently mouse-like relative tracking that they are sometimes marketed as mice.

As the name suggests, this type of mouse is intended to provide optimum comfort and avoid injuries such as carpal tunnel syndrome , arthritis and other repetitive strain injuries.

It is designed to fit natural hand position and movements, to reduce discomfort. When holding a typical mouse, ulna and radius bones on the arm are crossed.

Some designs attempt to place the palm more vertically, so the bones take more natural parallel position. A mouse may be angled from the thumb downward to the opposite side — this is known to reduce wrist pronation.

Another solution is a pointing bar device. The so-called roller bar mouse is positioned snugly in front of the keyboard, thus allowing bi-manual accessibility.

These mice are specifically designed for use in computer games. They typically employ a wider array of controls and buttons and have designs that differ radically from traditional mice.

Some mice may include several different rests with their products to ensure comfort for a wider range of target consumers.

Cordless mice instead transmit data via infrared radiation see IrDA or radio including Bluetooth , although many such cordless interfaces are themselves connected through the aforementioned wired serial buses.

While the electrical interface and the format of the data transmitted by commonly available mice is currently standardized on USB, in the past it varied between different manufacturers.

Mouse use in DOS applications became more common after the introduction of the Microsoft Mouse , largely because Microsoft provided an open standard for communication between applications and mouse driver software.

Thus, any application written to use the Microsoft standard could use a mouse with a driver that implements the same API, even if the mouse hardware itself was incompatible with Microsoft's.

This driver provides the state of the buttons and the distance the mouse has moved in units that its documentation calls " mickeys ", [76] as does the Allegro library.

In the s, the Xerox Alto mouse, and in the s the Xerox optical mouse , used a quadrature-encoded X and Y interface. This two-bit encoding per dimension had the property that only one bit of the two would change at a time, like a Gray code or Johnson counter , so that the transitions would not be misinterpreted when asynchronously sampled.

The earliest mass-market mice, such as on the original Macintosh , Amiga , and Atari ST mice used a D-subminiature 9-pin connector to send the quadrature-encoded X and Y axis signals directly, plus one pin per mouse button.

The mouse was a simple optomechanical device, and the decoding circuitry was all in the main computer. The DE-9 connectors were designed to be electrically compatible with the joysticks popular on numerous 8-bit systems, such as the Commodore 64 and the Atari Although the ports could be used for both purposes, the signals must be interpreted differently.

As a result, plugging a mouse into a joystick port causes the "joystick" to continuously move in some direction, even if the mouse stays still, whereas plugging a joystick into a mouse port causes the "mouse" to only be able to move a single pixel in each direction.

Because the IBM PC did not have a quadrature decoder built in, early PC mice used the RS C serial port to communicate encoded mouse movements, as well as provide power to the mouse's circuits.

The Mouse Systems Corporation version used a five-byte protocol and supported three buttons. The Microsoft version used a three-byte protocol and supported two buttons.

Due to the incompatibility between the two protocols, some manufacturers sold serial mice with a mode switch: "PC" for MSC mode, "MS" for Microsoft mode.

In Apple first implemented the Apple Desktop Bus allowing the daisy-chaining linking together in series, ie. After the host sends a special command sequence, it switches to an extended format in which a fourth byte carries information about wheel movements.

The IntelliMouse Explorer works analogously, with the difference that its 4-byte packets also allow for two additional buttons for a total of five.

Mouse vendors also use other extended formats, often without providing public documentation. In the late s, Logitech created ultrasound based tracking which gave 3D input to a few millimeters accuracy, which worked well as an input device but failed as a profitable product.

The industry-standard USB Universal Serial Bus protocol and its connector have become widely used for mice; it is among the most popular types.

Some of these can be stored inside the mouse for safe transport while not in use, while other, newer mice use newer " nano " receivers, designed to be small enough to remain plugged into a laptop during transport, while still being large enough to easily remove.

The Logitech Metaphor, the first wireless mouse Some systems allow two or more mice to be used at once as input devices. Lates era home computers such as the Amiga used this to allow computer games with two players interacting on the same computer Lemmings and The Settlers for example.

The same idea is sometimes used in collaborative software , e. Microsoft Windows , since Windows 98 , has supported multiple simultaneous pointing devices.

Because Windows only provides a single screen cursor, using more than one device at the same time requires cooperation of users or applications designed for multiple input devices.

Multiple mice are often used in multi-user gaming in addition to specially designed devices that provide several input interfaces.

Starting with Windows XP, Microsoft introduced an SDK for developing applications that allow multiple input devices to be used at the same time with independent cursors and independent input points.

However, it no longer appears to be available. The new input points provide traditional mouse input; however, they were designed with other input technologies like touch and image in mind.

As of , Linux distributions and other operating systems that use X. However, currently no window managers support Multi-Pointer X leaving it relegated to custom software usage.

There have also been propositions of having a single operator use two mice simultaneously as a more sophisticated means of controlling various graphics and multimedia applications.

Mouse buttons are microswitches which can be pressed to select or interact with an element of a graphical user interface , producing a distinctive clicking sound.

Since around the late s, the three-button scrollmouse has become the de facto standard. Users most commonly employ the second button to invoke a contextual menu in the computer's software user interface, which contains options specifically tailored to the interface element over which the mouse cursor currently sits.

By default, the primary mouse button sits located on the left-hand side of the mouse, for the benefit of right-handed users; left-handed users can usually reverse this configuration via software.

Nearly all mice now have an integrated input primarily intended for scrolling on top, usually a single-axis digital wheel or rocker switch which can also be depressed to act as a third button.

Though less common, many mice instead have two-axis inputs such as a tiltable wheel, trackball , or touchpad.

Those with a trackball may be designed to stay stationary, using the trackball instead of moving the mouse. Mickeys per second is a unit of measurement for the speed and movement direction of a computer mouse, [76] where direction is often expressed as "horizontal" versus "vertical" mickey count.

However, speed can also refer to the ratio between how many pixels the cursor moves on the screen and how far the mouse moves on the mouse pad, which may be expressed as pixels per mickey, pixels per inch , or pixels per centimeter.

In early mice, this specification was called pulses per inch ppi. If the default mouse-tracking condition involves moving the cursor by one screen-pixel or dot on-screen per reported step, then the CPI does equate to DPI: dots of cursor motion per inch of mouse motion.

However, software can adjust the mouse sensitivity, making the cursor move faster or slower than its CPI.

Current [update] software can change the speed of the cursor dynamically, taking into account the mouse's absolute speed and the movement from the last stop-point.

In most software, an example being the Windows platforms, this setting is named "speed," referring to "cursor precision". However, some operating systems name this setting "acceleration", the typical Apple OS designation.

This term is incorrect. Mouse acceleration in most mouse software refers to the change in speed of the cursor over time while the mouse movement is constant.

For simple software, when the mouse starts to move, the software will count the number of "counts" or "mickeys" received from the mouse and will move the cursor across the screen by that number of pixels or multiplied by a rate factor, typically less than 1.

The cursor will move slowly on the screen, with good precision. When the movement of the mouse passes the value set for some threshold, the software will start to move the cursor faster, with a greater rate factor.

Usually, the user can set the value of the second rate factor by changing the "acceleration" setting.

Operating systems sometimes apply acceleration, referred to as " ballistics ", to the motion reported by the mouse.

For example, versions of Windows prior to Windows XP doubled reported values above a configurable threshold, and then optionally doubled them again above a second configurable threshold.

These doublings applied separately in the X and Y directions, resulting in very nonlinear response. Engelbart's original mouse did not require a mousepad; [96] the mouse had two large wheels which could roll on virtually any surface.

However, most subsequent mechanical mice starting with the steel roller ball mouse have required a mousepad for optimal performance.

The mousepad, the most common mouse accessory, appears most commonly in conjunction with mechanical mice, because to roll smoothly the ball requires more friction than common desk surfaces usually provide.

Most optical and laser mice do not require a pad, the notable exception being early optical mice which relied on a grid on the pad to detect movement e.

Mouse Systems. Whether to use a hard or soft mousepad with an optical mouse is largely a matter of personal preference.

One exception occurs when the desk surface creates problems for the optical or laser tracking, for example, a transparent or reflective surface, such as glass.

Some mice also come with small "pads" attached to the bottom surface, also called mouse feet or mouse skates, that help the user slide the mouse smoothly across surfaces.

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