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IBM System/370 Model 145
This was the first IBM computer to use semiconductors in its memory. As a result, it was almost 5 times faster than its predecessor. It could also hold twice the capacity in the same space--which, being the early '70s, was still an entire room! -
The first "Pong" arcade cabinet
"Pong" was designed by Allan Alcorn at Atari, and was one of the first video games ever made for public release. It was a smash hit in bars and arcades all across the country, and kickstarted the commercial gaming industry as we know it. -
Ethernet
While not commercially released until 1980, Ethernet emerged in the private sector in the early-mid 70s, developed by Xerox to allow their systems to interconnect. It is still the standard used to internet connectivity to this day--though with decades of improvements and refinement, of course. -
Apple II
The Apple II was the titular company's breakout success. It was developed by Steve Wozniak and Rod Holt, with co-founder Steve Jobs responsible for its marketing. It was one of the first successful mass-produced microcomputers; basically, the Raspberry Pi of the '70s! -
"MUD1", the first precursor to the modern MMO
"MUD" stands for "Multi-User Dungeon", and was created by University of Essex students Roy Trubshaw and Richard Bartle starting in 1978. Primitive by today's online game standards, it was essentially a multiplayer version of contemporary text adventure games like "Zork" and "Colossal Cave Adventure". By 1984, more than 100 other MUDs had gained popularity across the world.