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Like all epic heroes, he died, Moses like, on the threshold of the Promised Land to which he had led the world.
Like all epic heroes, he died, Moses like, on the threshold of the Promised Land to which he had led the world.
====Fundamental idea of the Internet====
If you've ever tried to transfer anything from a Windows PC to a Mac, you know how much of a pain in the butt working with different operating systems is. At least, in this case, the developers of Windows and macOS know that their users will have to work with other computers of the same or a different operating system, and have put some thought into making their operating systems compatible with each other. Imagine what it must have been like for the Internet's first pioneers, who had to link together computers whose creators never envisioned would ever ''need'' to compatible with any other ones!
A university, company, or government agency would have one big mainframe computer all whose users would "time-share" on it. (See [[#Time-sharing|above]] if you don't remember.) If you needed to transfer a program from one computer to another, you'd physically take the punched cards or the magnetic tape and feed it into the other computer. Woe betide you if you tripped carrying a stack of punched cards and had to sort them back into the right order!
This sounds simple, but like almost everything in these days, it was not. Unless you got lucky, the computer you were transferring to didn't read the same language as the one you were transferring from. In fact, it had only been a few years since a standard system for representing ''letters'' (ASCII) had been agreed upon! So, most people would have just given up and coded the program all over again in the language of the target computer. It would have been a herculean, and most probably futile, effort, to make all these giant, slow mainframes compatible with each other.
Fortunately, an ingenious idea ensured that'd never need to happen.
The idea was simple: create a standard protocol for just the network. Have smaller packet-switching computers connected to each big computer in the network, that will convert things sent from the computer to this protocol. Each node will be responsible for the conversions from their own computer to the protocol.
The packet-switching computers were called Interface Message Processors or IMPs; the abbreviation was pronounced like the word "imp". They are the ancestors of today's routers, but you'd never guess that just by looking at them. They were the size of a refrigerator and taller than those who operated them. But without them we wouldn't have modems, and therefore not routers.
The IMPs were built by Bolt, Beranek, and Newman, or BBN for short. They were a private company but they were referred to as "Cambridge's third university" - after Harvard and MIT, which gives you an idea of how well they were regarded. Four were built.


==Notes==
==Notes==
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