>> the
same year the first laptop-sized portable computer, the Epson
HX-20
That's not true. The Husky Hunter was shipping in '81. And if the author
refers only to "laptop-sized portable computer" then s/he should
consider the Donner 3500.
>> The Dulmont Magnum was released in Australia
in 1981?82
I don't think that is true, or at least, I've seen no proof. If it is
true, then it beats Grid, because it had a battery.
Rant: It makes me want to bang my head against a wall when people write
whatever they happen to hear / prefer as "first".