This is done as because you can access the memory at any random point i-e randomly.
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The "door" that was opened was the access to China and all of it's trading ports.
No difference really, they still take 1's and 0's and make mathematical calculations corresponding to their instruction sets (CPU). What is DONE with that has changed dramatically tho, with every new generation, and that's about the only real difference...well besides the darn size thing. Any more of an answer would be doing your test for you, and take far more room than this page offers. 1st generation computers used vacuum tubes. This generation spanned roughly 1940s to 1958. Today's generation uses very complicated integrated circuits. It started no earlier than the 1990s. A typical single IC from a modern computer contains several orders of magnitude more components than an entire 1st generation computer occupying an entire room, and runs at speeds unimaginable in the 1st generation.
It means The Second for example Random Guy II is Random Guy The Second. It is another name for Jr. For example Random Guy Jr. can be Random Guy II AA: Sometimes it is used if you have the same name as your grandfather. It distinguishes you from your grandfather. (There is a Davy Crocket VII)
Surname comes after their given name.
Your given name is the name your parents chose for you. It's your own personal name, as opposed to your surname or family name, which is not normally a matter of choice. Whether your given name comes before or after your family name depends on the custom in your culture.