[Coco] Coco4?

[iggybeans at comcast.net]

>FPGA is definitely the only way a true CoCo4 could be made. 

>A CoCo3+ is more achievable as a base CoCo3 with an enhancement of some kind. 

>I think the most useful would be some sort of CPU acceleration. 

>Also, maybe something that also incorporate a 15Khz upscaler to drive LCD 
>monitors. 

>Nick 

All good ideas from someone who has weighed in on this before. 
Right now, one thing I have been working on in my design is trying to incorporate a second CPU as an I/O processor and to facilitate DMA. 
I like those last two ideas Nick mentioned. 

Isn't there already someone building a VGA adapter? 
And, since we sort of max out at around 3.58 MHz (and even that isn't practical with the rest of the components unable to run synchronized at that speed), 
I guess you are back to an FPGA. 

If someone builds a decent 6309 core, that would be a nice start.