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NewtonScript
NewtonScript is a prototype-based programming language created to write programs for the Newton platform. It is heavily influenced by the Self programming language, but modified to be more suited to needs of mobile and embedded devices. History On August 3, 1993, Apple unveiled the Apple Newton MessagePad. The device had 640 KB RAM, 4 MB ROM, and a 20 MHz ARM 610 microprocessor. The main intention behind Newton project, was to develop a device capable of replacing a computer while being portable. With limited battery and memory, the developers were looking for programming language capable of meeting these challenges. The developers looked at the C++ programming language but realized that it lacked flexibility. They started focusing on prototype based languages and were impressed with Smalltalk and Self. Concurrently Apple was developing another dynamic programming language called Dylan, which was a strong candidate for the Newton platform. However, both Self and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Apple Newton
The Newton is a specified standard and series of personal digital assistants (PDAs) developed and marketed by Apple Inc., Apple Computer, Inc. from 1993 to 1998. An early device in the PDA categorythe term itself originating with the Newtonit was the first to feature handwriting recognition. Newton devices run on a proprietary operating system, Newton OS; unlike the company's Mac (computer), Macintosh computers, Apple licensed the software to third-parties, who released Newton devices alongside Apple's own MessagePad line. Apple started developing the platform in 1987; concepted by Steve Sakoman as a Tablet computer, tablet-like device with handwriting capabilities, he worked with AT&T Corporation to develop a low-power processor, AT&T Hobbit, Hobbit, for the project. However, slow progress and other issues led to Sakoman leaving Apple in 1990 to form Be Inc., Be Computer, Inc. The Newton project would be revitalized by Michael Tchao and Steve Capps who pitched the idea directly ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Newton (platform)
The Newton is a specified standard and series of personal digital assistants (PDAs) developed and marketed by Apple Computer, Inc. from 1993 to 1998. An early device in the PDA categorythe term itself originating with the Newtonit was the first to feature handwriting recognition. Newton devices run on a proprietary operating system, Newton OS; unlike the company's Macintosh computers, Apple licensed the software to third-parties, who released Newton devices alongside Apple's own MessagePad line. Apple started developing the platform in 1987; concepted by Steve Sakoman as a tablet-like device with handwriting capabilities, he worked with AT&T Corporation to develop a low-power processor, Hobbit, for the project. However, slow progress and other issues led to Sakoman leaving Apple in 1990 to form Be Computer, Inc. The Newton project would be revitalized by Michael Tchao and Steve Capps who pitched the idea directly to CEO John Sculley; Apple invested in Acorn Computers w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Io (programming Language)
Io is a pure object-oriented programming language inspired by Smalltalk, Self, Lua, Lisp, Act1, and NewtonScript. Io has a prototype-based object model similar to those in Self and NewtonScript, eliminating the distinction between instance and class. Like Smalltalk, everything is an object and it uses dynamic typing. Like Lisp, programs are just data trees. Io uses actors for concurrency. Remarkable features of Io are its minimal size and openness to using external code resources. Io is executed by a small, portable virtual machine. History The language was created by Steve Dekorte in 2002, after trying to help a friend, Dru Nelson, with his language, Cel. He learned that he really didn't know much about how languages worked, and set out to write a tiny language to understand the problems better. Philosophy Io's goal is to explore conceptual unification and dynamic languages, so the tradeoffs tend to favor simplicity and flexibility over performance. Features * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Prototype-based Programming
Prototype-based programming is a style of object-oriented programming in which behavior reuse (known as inheritance) is performed via a process of reusing existing objects that serve as prototypes. This model can also be known as ''prototypal'', ''prototype-oriented,'' ''classless'', or ''instance-based'' programming. Prototype-based programming uses the process generalized objects, which can then be cloned and extended. Using fruit as an example, a "fruit" object would represent the properties and functionality of fruit in general. A "banana" object would be cloned from the "fruit" object and general properties specific to bananas would be appended. Each individual "banana" object would be cloned from the generic "banana" object. Compare to the class-based paradigm, where a "fruit" ''class'' would be extended by a "banana" ''class''. History The first prototype-based programming languages were Director a.k.a. Ani (on top of MacLisp) (1976-1979), and contemporaneously and no ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Prototype-based Programming Languages
Prototype-based programming is a style of object-oriented programming in which behavior reuse (known as inheritance) is performed via a process of reusing existing objects that serve as prototypes. This model can also be known as ''prototypal'', ''prototype-oriented,'' ''classless'', or ''instance-based'' programming. Prototype-based programming uses the process generalized objects, which can then be cloned and extended. Using fruit as an example, a "fruit" object would represent the properties and functionality of fruit in general. A "banana" object would be cloned from the "fruit" object and general properties specific to bananas would be appended. Each individual "banana" object would be cloned from the generic "banana" object. Compare to the class-based paradigm, where a "fruit" ''class'' would be extended by a "banana" ''class''. History The first prototype-based programming languages were Director a.k.a. Ani (on top of MacLisp) (1976-1979), and contemporaneously and not in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Self (programming Language)
Self is a general-purpose, high-level, object-oriented programming language based on the concept of '' prototypes''. Self began as a dialect of Smalltalk, being dynamically typed and using just-in-time compilation (JIT) with the prototype-based approach to objects: it was first used as an experimental test system for language design in the 1980s and 1990s. In 2006, Self was still being developed as part of the Klein project, which was a Self virtual machine written fully in Self. The latest version, 2024.1 was released in August 2024. Several just-in-time compilation techniques were pioneered and improved in Self research as they were required to allow a very high level object oriented language to perform at up to half the speed of optimized C. Much of the development of Self took place at Sun Microsystems, and the techniques they developed were later deployed for Java's HotSpot virtual machine. At one point a version of Smalltalk was implemented in Self. Because it was ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Dylan (programming Language)
Dylan is a multi-paradigm programming language that includes support for functional and object-oriented programming (OOP), and is dynamic and reflective while providing a programming model designed to support generating efficient machine code, including fine-grained control over dynamic and static behaviors. It was created in the early 1990s by a group led by Apple Computer. Dylan derives from Scheme and Common Lisp and adds an integrated object system derived from the Common Lisp Object System (CLOS). In Dylan, all values (including numbers, characters, functions, and classes) are first-class objects. Dylan supports multiple inheritance, polymorphism, multiple dispatch, keyword arguments, object introspection, pattern-based syntax extension macros, and many other advanced features. Programs can express fine-grained control over dynamism, admitting programs that occupy a continuum between dynamic and static programming and supporting evolutionary development (allowing f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
MessagePad
The MessagePad is a series of personal digital assistant devices developed by Apple Inc., Apple Computer for the Apple Newton, Newton platform, first released in 1993. Some electronic engineering and the manufacture of Apple's MessagePad devices was undertaken in Japan by Sharp Corporation, Sharp. The devices are based on the ARM architecture family, ARM ARM architecture#Advanced RISC Machines Ltd. – ARM6, 610 Reduced instruction set computer, RISC processor, run Newton OS, and all feature handwriting recognition software. Alongside the MessagePad series, Apple also developed and released the eMate 300 Newton device. History The development of the Newton MessagePad first began with Apple Inc., Apple's former senior vice president of research and development, Jean-Louis Gassée; his team included Steve Capps, co-writer of Classic Mac OS, Mac OS Finder (software), Finder, and an employed engineer named Steve Sakoman. The development of the Newton MessagePad operated in secret un ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Differential Inheritance
Differential inheritance is a common Inheritance (object-oriented programming), inheritance model used by Prototype-based programming, prototype-based programming languages such as JavaScript, Io (programming language), Io and NewtonScript. It operates on the principle that most objects are derived from other, more general objects, and only differ in a few small aspects; while usually maintaining a list of pointers internally to other objects which the object differs from. An analogy To think of differential inheritance, you think in terms of what is different. So for instance, when trying to describe to someone how Dumbo looks, you could tell them in terms of elephants: ''Think of an elephant. Now Dumbo is a lot shorter, has big ears, no tusks, a little pink bow and can fly.'' Using this method, you don't need to go on and on about what makes up an elephant, you only need to describe the differences; anything not explicitly different can be safely assumed to be the same. See also ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Embedded System
An embedded system is a specialized computer system—a combination of a computer processor, computer memory, and input/output peripheral devices—that has a dedicated function within a larger mechanical or electronic system. It is embedded as part of a complete device often including electrical or electronic hardware and mechanical parts. Because an embedded system typically controls physical operations of the machine that it is embedded within, it often has real-time computing constraints. Embedded systems control many devices in common use. , it was estimated that ninety-eight percent of all microprocessors manufactured were used in embedded systems. Modern embedded systems are often based on microcontrollers (i.e. microprocessors with integrated memory and peripheral interfaces), but ordinary microprocessors (using external chips for memory and peripheral interface circuits) are also common, especially in more complex systems. In either case, the processor(s) us ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
