But does it run Linux?
If not then good luck writing code to page out to that 512k of RAM. I do wonder what the 1980 computer scene would have been like if 512k was there because that was the smallest amount available, instead of the normal 16k. It was only when the PC came along that this amount of memory was available. PC programs took a while to be as concisely optimised as home computer code had to be. So maybe the scarcity of RAM was a good thing.
Not sure if you're being sarcastic or not. But the Z80 is a 8 bit CPU. Linux was never ported to any 8 or 16 bit architectures - for rather obvious reasons.
Well, the ELKS[1][2] project has been working on a 16bit port on and off since the late 90s. At one point Alan Cox[3] was an active contributor.
[1] http://elks.sourceforge.net/