And even more PCjs/PCx86 disambiguation
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Jeff Parsons
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---
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layout: page
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title: JavaScript Machines
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title: About PCjs
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menu_title: About
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menu_order: 9
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permalink: /docs/about/
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---
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## About JavaScript Machines
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## About PCjs
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The JavaScript Machines Project is a collection of computer simulations written in [JavaScript](/modules/).
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It has been released on GitHub as the [PCjs Project](https://github.com/jeffpar/pcjs), a copy of which
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is hosted here at [{{ site.pcjs.domain }}]({{ site.url }}/) (formerly [jsmachines.net](http://jsmachines.net/)).
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The [PCjs Project](https://github.com/jeffpar/pcjs) is a collection of computer simulations written in
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[JavaScript](/modules/). The project is maintained on GitHub and is hosted here at
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[{{ site.pcjs.domain }}]({{ site.url }}/) (formerly [jsmachines.net](http://jsmachines.net/)).
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The goals of the project are to create fast, full-featured simulations of classic computer
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hardware, help people understand how these early machines worked, make it easy to experiment with different machine
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@ -25,37 +25,34 @@ capabilities can be found in the [Documentation](/docs/).
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### Emulating the Challenger 1P
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The first JavaScript Machines simulation was [C1Pjs](/docs/c1pjs/), a simulation of the
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The first PCjs simulation was [C1Pjs](/docs/c1pjs/), a simulation of the
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Challenger 1P, which was a 6502-based microcomputer introduced by Ohio Scientific in 1978.
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C1Pjs v1.0 was released in July 2012, originally on ecpsim.org and cpusim.org, and then
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[jsmachines.net](http://jsmachines.net/), which has since become [{{ site.pcjs.domain }}]({{ site.url }}/).
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More information about the first release of C1Pjs was also [posted](http://osiweb.org/osiforum/viewtopic.php?f=3&t=103)
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on the [OSI Discussion Forum](http://osiweb.org/osiforum/index.php) at [osiweb.org](http://osiweb.org/).
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C1Pjs v1.0 was released in July 2012. More information about the first release of C1Pjs was
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[posted](http://osiweb.org/osiforum/viewtopic.php?f=3&t=103) on the
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[OSI Discussion Forum](http://osiweb.org/osiforum/index.php) at [osiweb.org](http://osiweb.org/).
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---
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### Emulating the IBM PC
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The next JavaScript Machines simulation was [PCx86](/docs/about/pcx86/), which simulates the original IBM PC, IBM PC XT,
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and IBM PC AT. Browse the [source code](/modules/pcx86/) here or on [GitHub](https://github.com/jeffpar/pcjs).
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The next PCjs simulation was [PCx86](/docs/about/pcx86/), which simulates the original IBM PC, IBM PC XT,
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and IBM PC AT. PCx86 v1.0 was released in late 2012. Browse the source code [here](/modules/pcx86/) or on
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[GitHub](https://github.com/jeffpar/pcjs).
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[PCx86](/docs/about/pcx86/) emulates the Intel 8088, 80186, 80286 and 80386 CPUs, as well as IBM Monochrome Display
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Adapter (MDA), Color Graphics Adapter (CGA), Enhanced Graphics Adapter (EGA), and Video Graphics Array (VGA) video
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cards, along with assorted motherboard and expansion bus components. It also includes an optional
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[Debugger](/docs/pcx86/debugger/) and a user-configurable [Control Panel](/docs/pcx86/panel/).
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PCx86 v1.0 was released on [jsmachines.net](http://jsmachines.net/) in late 2012, and the JavaScript Machines Project,
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with its second full-featured machine emulation, was launched.
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Read [About PCx86](/docs/about/pcx86/) to learn more about its history, features, and upcoming improvements.
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---
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### Migrating to Node: The PCjs Project
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### Migrating to Node
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The JavaScript Machines Project was migrated to a [Node.js](http://nodejs.org) web server in 2014, and became the
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PCjs Project.
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The PCjs web server was originally written in PHP and hosted at [jsmachines.net](http://jsmachines.net/), but in 2014,
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it was migrated to a [Node.js](http://nodejs.org) web server and hosted at [pcjs.org](http://www.pcjs.org/).
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The goals included:
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@ -63,11 +60,18 @@ The goals included:
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- Leveraging the Node.js web server to provide more sophisticated I/O capabilities
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- Improving overall website design, including structure, appearance and responsiveness
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The PCjs web server includes a number of custom Node modules that provide many of the same server-side features
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The PCjs Node web server includes a number of custom Node modules that provide many of the same server-side features
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found on [jsmachines.net](http://jsmachines.net/), including new ROM and disk image conversion APIs, and a
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Markdown module that supports a subset of the [Markdown syntax](http://daringfireball.net/projects/markdown/syntax),
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including extensions to the link syntax that make it easy to embed C1Pjs and PCx86 machine files in Markdown documents.
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### Migrating to GitHub Pages
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To simplify hosting requirements, the PCjs Project was migrated to GitHub Pages in late 2015. The project still
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includes the original Node-based web server, which is useful for development and debugging, but for production sites
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(including [pcjs.org](http://www.pcjs.org/), using Jekyll to generate a static copy of the project for the web is the
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preferred solution.
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---
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License
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