What was the first portable computer?

Author's Note

When researching this article, it was interesting to see how passionate some people can be about older computers. Many models are still in use by enthusiasts. You can still buy the printer ribbon and other accessories for the Epson HX-20, and I came across a person who still writes programs meant to be used on it. The earliest laptop I can remember using was my father's and it was supplied by his employer for work. He sometimes brought it home so I could play the first "Sim City" on it, and this was around 1990. I wish I could remember the model, but I do recall that it was impressively small compared to the computers I was using at school!

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