Hardware and execution time

Let's travel back in time to May 5, 1992. Apogee Software begins publishing the now known cult classic Wolfenstein 3D developed by id Software:

The man with the vision, John Carmack, took massive strides forward and not only popularized, but also revolutionized the first person shooter genre on the PC. Its massive success cannot be overstated, as even now it's difficult to accurately predict how many times it has been downloaded. Having grown up at right around that time, one can't help but feel nostalgic sometimes and attempt to play this game again. Ever since its original release for the DOS operating system on the PC, it has been ported to many other operating systems and consoles. While it's still possible to play it, we've come a long way since the days of using DOS. The environment our software runs in has fundamentally changed, ergo the software from the past is no longer compatible, hence the need for emulation.

Note

An emulator...