[Coco] Re: [Color Computer] Re: CoCo video?

[jdaggett at gate.net]

Mark

Maybe so. At least the HDL software is coming along slowly.  

I have

1) a synthesizable 6809 core now that will at least run at 12.5 MHz. Posible as fast 
as 20 MHz. 

2) a synthesizable IDE port.

3) a synthesizable PS2 port.

4) a synthesizable dual port SDRAM controller. This one is nice as it is configured to 
look like a SRAM. 

5) a synthesizable SPI core. 

There are USB cores available for free as well as a UARTs and VGA cores. A 
simple parallel port is not that difficult to do. 

The CPU core takes up 45% of the FPGA (XILINX XC2S300E). That should leave 
room for a lot of other goodies. What I have to do now is start integrating pieces and 
see how much room is left over. 

Future would be to have a synthesizable 6309 core. Which by the way thathas been 
started. 


james 


On 4 Mar 2006 at 11:33, Mark McDougall wrote:

> jdaggett at gate.net wrote:
> 
> > A 20 MHz 6809 MPU with 8MB of external SDRAM, 2 ide ports, a parallel
> > port, 2 serial ports, 2 usb ports and a 512 color VGA module is actually
> > doable. This should fit into a Xilinx XC2S300E part.  Even add some flash
> > and a SPI port to access CF cards would enrich a fantasy even more.
> 
> Definitely so. But the problem is that writing the software to utilise all 
> this would take several times longer to develop than the hardware itself.
> 
> Regards,
> 
> -- 
> |              Mark McDougall                | "Electrical Engineers do it
> |  <http://members.iinet.net.au/~msmcdoug>   |   with less resistance!"
> 
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