[Coco] Re: Coco Repack

[Kevin Diggs]

Hi,

	I get it. The segment (block, page, whatever you want to call them)
count is fixed at 256 (i.e. 8-bit). We can change that to if we wanna.

	And yes I do realize that NitrOS9 would have to be ... reworked.
Maybe it should be parameterized to handle differing MMU page sizes
anyway.

					kevin
KnudsenMJ at aol.com wrote:
> 
> In a message dated 8/7/04 10:09:18 PM Eastern Daylight Time,
> kevdig at hypersurf.com writes:
> 
> >   Forgive my stupidity, but why does reallocating the bits in the
> >  address cut the max memory to 1 Meg (from 2?)?
> 
> Let's assume you restrict the MMU registers to 8 bits, so process DAT images
> can be stored in one byte per segment.  8 bits means 256 total RAM segments,
> no more!
> 
> Currently those are 8K apiece, times 256 = 2 Megs.
> Many of us once longer for smaller segments, like 4K, but times 256 is only 1
> Meg total.
> 
> It's a tradeoff between total RAM size and segment sizes.  After a lot of
> public head bashing against the walls, some years ago we concluded that Tandy's
> original design of 8K wasn't so bad after all.
> 
> Besides, it's what the DEC PDP-11 family used -- the machines where UNIX was
> nurtured, if not born.  --Mike K.
> 
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