[Coco] embeddedcoco

[jdaggett at gate.net]

Eric

What I want to do is more specialized. A simple CPU board with memory and 
mapped I/O will not totally do what I need. Basically I require almost is a repacked 
Coco 3 with a LCD as a monitor than a CRT or RGB monitor. 

But from a concensus the more accepted is to make a CPU board with up to 32K of 
Ram and Rom with the mapped I/O equal to that of the Coco. Then what can be 
done is a breadboard type card be plugged into it as a daughter board. On that the 
individual can add what ever interface circuits he needs and he is off and running. 

If you intend the coco to be a developemnt system then you may want ot have a 
card that plugs into the coco expansion slot and has the capability of pluging in the 
interface card onto it so that software can be developed. 

james

On 28 Dec 2003 at 13:03, peak at mail.polarcomm.com wrote:

> 6829MMU
> Thanks to both James and Paul for info about that chip.
> In the case that we would not be running an operating system 
> which could/would "allocate" memory blocks it might be 
> simpler to just use soft switches.
> 
> For instance, In james's application of a telescope 
> controller it seems to me that he would need a large amount 
> of memory to store coordinates. I do not know what form 
> these "coordinates" would have but "The Heavens" are large!!!
> One soft switch could be used for Pseudo address lines.
> Another could be used for Bank Enable signals.
> Using both methods together, the fake address lines (A15-A22)
> together with the real address lines will address an 8MB 
> block and then using 8 enable lines gives 8 times 8mb for 
> 64Mb of memory. I have already "Drawn-Up" a circuit like this 
> but without the memory chips/card.
> It seems to me that it would not be difficult to construct a 
> software "MAT" -Memory Allocation Table- to keep track of 
> things.
> 
> Note: I am not familiar with memory cards/chip in 8MB units 
> except for Dynamic Rams SIMM's. Perhaps there is a flash 
> memory card that could be connected though. Just what is 
> inside that 8MB memory card that plugs into my sons Play 
> Station game??
> Eric
> 
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