in bills euology to paul allen seen here:https://www.msn.com/en-us/money/markets/bill-gates-what-i-loved-about-paul-allen/ar-BBOxZn2
He wrote this :
"We decided to start our next, more successful venture in December 1974. Paul and I were both living in the Boston area—he was working, and I was going to college. One day he came and got me, insisting that I rush over to a nearby newsstand with him. When we arrived, he showed me the cover of the January issue of Popular Electronics. It featured a new computer called the Altair 8800, which ran on a powerful new chip. Paul looked at me and said: “This is happening without us!” That moment marked the end of my college career and the beginning of our new company, Microsoft.
In those days, the chips were so limited that you couldn’t do what’s called “native development”—you couldn’t use a machine with that chip in it as you were developing the software for it. That made writing code for those chips pretty challenging. Paul had a great idea: to write some code that would let us emulate those chips on a more powerful computer, then port it over to the machine with the less powerful chip. That breakthrough was important for a lot of Microsoft’s early success, and Paul deserves credit for it. "
Now days emulation is mainly used for old video/pc games and for making things work on other things its not exactly meant to ie you can put android on a pc with the right emulator
but if they were the first to come up with the idea I wonder what bill would think of MAME ect …….