[Coco] SDCC and other C topics

[jdaggett at gate.net]

Boisy

Adding two more task registers is not a problem. Rather easy to do. Since the INIT1 
register (FF91) has bits 1 through 4 unused, any one or more of these can be used 
to define any pair of tasks. Right now the MMU is setup for one pair of tasks and are 
switched by the TR bit. All I would have to do is add a 4 to 16 decoder and duplicate 
the MMU circuitry 16 times. That would lead to 32 tasks and require 2 Megs of ram! 
Each task with its own 64K!!!! 

My father and I have started some remodeling of the house the past two months 
and are now about halfway through. Once the workshop is completed I will have 
more space to do some soldering and testing. Right now I just do not have any 
place that I can do soldering and testing. Should be done with the remodeling by the 
end of April,  weather permitting. Then I can finish several projects and a start a 
bunch more. 


james


On 19 Mar 2005 at 15:18, Boisy G. Pitre wrote:

From:           	"Boisy G. Pitre" <boisy at boisypitre.com>
Subject:        	Re: [Coco] SDCC and other C topics
Date sent:      	Sat, 19 Mar 2005 15:18:49 -0600
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> James,
> 
> Assuming room can be found, this would be an ideal enhancement into
> your work on the next generation GIME.  How is that coming along?
> 
> Boisy
> 
> On Mar 19, 2005, at 3:10 PM, jdaggett at gate.net wrote:
> 
> > Curtis
> >
> > I can agree on the need for at least another TR bit. That would have
> > made the system better by allowing more tasks and their own heap of
> > memory. With 2 megs and more there is no reason as to not having at
> > least 4 tasks to be switched in at one time.
> >
> > I always thought that was one of the many limitation of the GIME
> > chip.
> >
> > james
> >
> >
> > On 18 Mar 2005 at 22:49, L. Curtis Boyle wrote:
> >
> > Date sent:      	Fri, 18 Mar 2005 22:49:27 -0600
> > From:           	"L. Curtis Boyle" <curtisboyle at sasktel.net>
> > Subject:        	Re: [Coco] SDCC and other C topics
> > To:             	CoCoList for Color Computer Enthusiasts
> > <coco at maltedmedia.com>
> > Send reply to:  	CoCoList for Color Computer Enthusiasts
> > <coco at maltedmedia.com>
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> > request at maltedmedia.com?subject=unsubscribe>
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> >
> >>  Things
> >> would have been better if Tandy had allow 3 or 4 separate  MMU set
> >> lists; GRFDRV could have been swapped in/out with a single store 
> >> into the task register select, instead of having to preload all of
> >> the MMU registers first and then switching tasks.
> >
> >
> >
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> --
> Boisy G. Pitre
> E-Mail: boisy at boisypitre.com
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> Web: www.boisypitre.com
> 
> 
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