Notices by ask (ask@infosec.exchange)

@foone my favorite thing about this is the 1981 IBM PC had literally 4 rows of ram chips each making up 64k which is exactly one segment size.

So if you space out your segments by 64k then the segment register is literally just selecting which of the 4 rows of chips to use.

You can also expand it with an additional 10 non-overlapping segments for 14 total (the rest of the address space is ROM).