Date   : Fri, 12 Aug 2011 13:41:26 +0100
From   : philb@... (Phil Blundell)
Subject: Risc PC (Was 'Minitel in France')

On Thu, 2011-08-11 at 19:10 +0000, J.G.Harston wrote:
> Phil Blundell wrote:
> > Not on MEMC, though.  One of the slightly unusual things about that
> > particular MMU implementation was that the page tables were "backwards":
> 
> That really took me some time to get my head around when I was
> first trying to understand it, as I was so used to (and it was more
> intuitive with) logical-to-physical mapping (eg the Z80
> 1MbMem.gif), not physical-to-logical mapping.

Yeah, I don't quite know why Acorn did it the way that they did in MEMC.
I guess it seemed like a good idea at the time for some reason but it's
hard to imagine what that reason might have been.

p.