[Coco] Coco 4 (Was: Test)

[jdaggett at gate.net]

Neil

I invision a mother board type layout using micro ATX form factor. 
Maybe with PCI type slots and headers to plug in for IDE and floppy 
drives. Maybe able to package in a reagular PC case with PS2 style 
mouse and keyboard. 

just some wild ideas

james




On 5 Jan 2004 at 13:40, Neil Morrison wrote:

> 
> I still like the idea of an "Expansion Interface" for the Coco 3, like
> the one for the Model I. Have a cable that plugs in the ROMPAK port
> and use a CPU that can run a hacked version of OS-9 so that the Coco 3
> handles keyboard, screen, sound etc. and the EI does the main
> computing with a better faster processor and plenty of RAM and
> supports the drives, full serial and parallel ports etc. The EI can
> sit under the CM-8 and hold it up a few inches.
> 
> Neil
> 
> ----- Original Message ----- 
> From: <jdaggett at gate.net>
> 
> 
> > Bill
> >
> > The real stumbling block is to a CoCo 4 is a chip that will be
> > backward compatible with the GIME Chip and improved version of
> > it.
> >
> > If there is no need to be backward compatible with the Coco 1,2 or
> 3
> > then a whole new chip in FPGA could be designed and go one step
> > further and do the CPU in FPGA. Then you can run the whole board at
> > around 25Mhz. Used SRAM and/or SDRAM.
> >
> > I would imagine some backward compatibility to the Coco 3 is
> > needed as to not have to do major rewrites to Nitros9. Just more
> > functionality of the GIME chip.
> >
> > james
> 
> 
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