[Coco] Re: Coco Repack

[Kevin Diggs]

Hi,

	I'm not talking on a per process basis, but a per system
basis. For example, maybe the quatro will use 1k.

					kevin

jdaggett at gate.net wrote:
> 
> Kevin
> 
> There can be a danger in allowing dynamic size on the fly.  Two or
> more processes with differing page size requirements are sure to
> have memory over write issues.
> 
> james
> 
> On 8 Aug 2004 at 9:51, Kevin Diggs wrote:
> 
> Date sent:              Sun, 08 Aug 2004 09:51:14 -0700
> From:                   Kevin Diggs <kevdig at hypersurf.com>
> To:                     CoCoList for Color Computer Enthusiasts
> <coco at maltedmedia.com>
> Subject:                Re: [Coco] Re: Coco Repack
> Send reply to:          CoCoList for Color Computer Enthusiasts
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> 
> > 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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