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JsDOSBox is a JavaScript port of jDosbox (https://sourceforge.net/projects/jdosbox/) which is itself a port of DOSBox (http://www.sourceforge.net/projects/dosbox).
Demonstration of JsDOSBox at
http://jsdosbox.sourceforge.net
Running a game demo at http://jsdosbox.appspot.com (Chrome recommended).
And running DOS demos at http://retropcdemos.appspot.com.
See website link below for details on recent changes and instructions.
http://sourceforge.net/p/jsdosbox/home/Home/
PCEmulator that runs inside a JavaScript environment. Demonstration can be seen booting FreeDOS at http://pc-emulator.appspot.com (useful for running old DOS shareware games) and graphical Linux at http://linuxjsemu.appspot.com/ (rather slowly). Runs best in Chrome browser. See my other JavaScript PCemulator project at http://sourceforge.net/projects/jsdosbox (faster, also includes a dynarec and sound)
YASP (Yet Another Simple Processor) is a 8-bit microprocessor with microcontroller capabilities (I/O ports, REQ, ACK) that can be used as a small computer for educational purposes. Its development environment includes simulators and assemblers.