Invariably been linked before, but http://imrannazar.com/GameBoy-Emulation-in-JavaScript:-The-CPU http://imrannazar.com/GameBoy-Emulation-in-JavaScript:-The-C..

Invariably been linked before, but http://imrannazar.com/GameBoy-Emulation-in-JavaScript:-The-CPU http://imrannazar.com/GameBoy-Emulation-in-JavaScript:-The-C... also addresses basics of emulator design.