Since you brought it up: in the 70s and 80s (and even into the very earl sc> > 90s),
1 MB of RAM was unimaginable, and 1 GB was absolutely impossible.
It didn't take that long to get to 1 MB.
And yet, it was still literally unimaginable for some pretty dominant players in the field, specifically one Bill Gates. I did some checking, though, and even the IBM clone army broke the 640k barrier by '85, so it turns out I was mistaken. Takes a while for technology to reach us savages in Canada, I guess...
The 68K desktops (Mac, Amiga, etc.) of the second half of the '80s mostly sc> shipped with at least 1 MB.
I have never been a fan of Crapple, mostly because of their business practices. And after my first 286, I never looked at a 68k-based machine again. Sure, it took Intel a while to get there, but when they did, they blew Motorola straight out of the water.
McDoob
SysOp, PiBBS
pibbs.sytes.net
... 640K ought to be enough for anybody. -Bill Gates, 1981.
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