The other side argues that an emulator should ultimately strive to simulate the hardware as much as possible, as that is the only way to achieve as much compatibility as possible, as well as the only way to preserve the hardware. The faithfulness of the emulator to the console it is emulating comes second to its overall ability to play games. One side argues that as long as an emulator plays the majority of games at full speed on most computers and devices without too many obvious glitches, it does not matter how accurately it actually replicates the original hardware and its many quirks and functions. There are basically two camps when it comes to the issue of accuracy. Such low level emulation requires a tremendous amount of power to run. The accuracy of these emulators are close to perfection, but at a steep CPU cost.Ĭircuit accurate emulators work by simulating each logic chip on the board individually. How much performance is taken depends on the way cycle accuracy is implemented and the skill of the coder. So each individual component is emulated at exactly the right time, and in perfect sync etc, which takes a performance hit.
Some high accuracy emulators can achieve 100% compatibility with commercially released games.Ĭycle accurate emulation is basically trying to perfectly emulate timings right down to per-cycle accesses. High accuracy emulators may or may not be cycle accurate. They will have fewer audio and visual glitches. High accuracy emulators try to replicate the original system as closely as possible, and for that reason take more CPU power to do so. Medium accuracy emulators will have fewer glitches, but will still have many problems. This means that the romhack can only be used in that one specific emulator. This can become very problematic when ROM hacks use these speedhacks to run by abusing the errors to create otherwise impossible behaviour. They will typically use various speedhacks to skip over problems, as a result many games only run due to a variety of patches while others don't work at all.
Low accuracy emulators will have a large amount of visual and audio glitches. There are hopes that less CPU power will be needed for more accuracy with the use of tighter programming. More accuracy means less graphics and audio glitches, at the cost of additional CPU power required to run the game at fullspeed. Accuracy is most often achieved by tighter syncing. Accuracy is how accurate the emulator is to the original hardware.
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