What's the proper implementation for hardware emulation?

Question

I\'m going to programme a Game Boy emulator (Z80 is the CPU in case somebody is not familiar with it), and while I was doing my research, I\'ve found some things I\'m not so

Answer 1

First suggestion, you shouldn't use nested switch statements, you should rather use array of function pointers, alot faster -> better emulation, and nicer code, nested switch-es can also get a bit messy, here are some links where you can read more about these arrays
http://www.newty.de/fpt/fpt.html
http://www.multigesture.net/wp-content/uploads/mirror/zenogais/FunctionPointers.htm

Second suggestion, Yes you can do it in C#, Java, C++, but since you want every single bit of your CPU cycles so you can get as close emulation as possible - emulating one CPU cycle of target architecture with least number of CPU cycles on curret architecture, and OOP isn't so good in this case from what I heard/read from people. One of the things is performance, and second is pretty much obvious, emulation is, as you probably noticed, really complex task and wraping it in OOP can be unnecessary pain in the neck.