PCE.js runs classic computers in the browser. It's a port of Hampa Hug's excellent PCE emulator, put together by James Friend.

PCE.js currently emulates Mac Plus, IBM PC/XT and Atari ST functionally in recent versions of Chrome and Firefox.

More info:

• Demo running Mac Plus + System 7
• Why port emulators to the browser?

PCE.js is available from npm as a set of browserify compatible node packages.

There is one for each emulator build:

• pcejs-macplus - Mac Plus
• pcejs-ibmpc - IBM PC/XT
• pcejs-atarist - Atari ST

See each of the above links for install and usage instructions

Note: This is a bit complicated. I recommend instead just using the npm packages listed above, unless you really want to hack on the C source of the emulators themselves (which is not necessary if you just want to get them running on a page).

Make sure you've installed node.js

Run npm install in this directory (the source root). This should install the required node.js tools to build the commonjs modules and run the examples.

Clone my fork of Emscripten and checkout the pcejs-fastcomp branch. Set it up according to the directions for running emscripten-fastcomp. Add the path to the emscripten fork repo to your $PATH so you can run emcc. Run ./pcejs_build env once which will create a pcejs_build_conf.sh file if it doesn't already exist. Then edit this file so the PCEJS_conf_emsdkpath setting points to where you cloned the emscripten fork repo (eg. where emcc can be found).

Similarly you should be working with my fork of PCE on the pcejs branch, but presumably that's where you're reading this right now.

Most of the build process involves running the pcejs_build bash script in the root of the repo. Commands should be run like pcejs_build [command] or pcejs_build [command] [arg]

Commands you might be interested in:

• build [target]: Configure, build and compile emulator to JS. [target] is either one of macplus, ibmpc, atarist or native. Specifiying an emulator arch builds the in-browser emulator JS file for that architecture. native builds all PCE executables normally. If you don't specify a [target] then all JS targets will be built.
• rebuild: Build last again
• clean: Clean source tree
• [nothing]: Build all emulator JS targets and (commonjs modules for each)

Other commands (used internally by build scripts)

• env: Print build environment variables
• configure: Configure emulator build
• make: Compile emulator source to LLVM bitcode (used by 'build')
• remake: Recompile only changed files of emulator source to LLVM bitcode
• afterbuild: Convert LLVM bitcode to JS
• module: Build commonjs module (used by commonjs module prepublish scripts)

Run pcejs_build build [target] to build the emulator, where [target] is macplus, ibmpc or atarist. This will output a pce-[target].js file to dist/.

Once the output file for the target you're interested in has been built, you can:

• run the examples in the example/ directory with example/run_example.sh [target]
• build the npm packages in the commonjs/[target]/ directories by running npm run prepublish in the respective directory.