[Coco] [Color Computer] Re: VHDL 6809

[James Diffendaffer]

The timing on the 6847 is what's nasty about it.  Timing for the video
output and memory accesses.  It may be less work to finish the first
version but getting everything working right would be another matter.
The SAM probably has more to it but is a little more straight forward
and would require less work in the long run.


--- In ColorComputer at yahoogroups.com, "John" <John0457 at h...> wrote:
> Hi James,
> 
> Sorry for the long delay in replying.
> I was wondering why I had not received any email from the list,
> and I just discovered it was going to my hotmail junk folder !!!
> Doh !!!
> 
> Anyway ... I received an email a frew weeks back from a friend who 
> must be on this list, talking about the 6847 and the 68... whatever 
> it is ... Synchronous Address Multiplexer (SAM). I had a look at my 
> motorola Data book circa 1981, and it is a possibility coding that. 
> The SAM is more work than the 6847. The 6847 appears to be slaved 
> off the SAM. I guess it's something only one person can work on 
> though, so its a matter of me finding some time to sit down and code 
> it.
> 
> John.
> 
> --- In ColorComputer at yahoogroups.com, "James Diffendaffer" 
> <jdiffendaffer at y...> wrote:
> > --- In ColorComputer at yahoogroups.com, "John" <John0457 at h...> wrote:
> > > Hi,
> > > 
> > > I just joined the group.
> > > I was wondering if anyone knew of any one implementing a CoCo
> > > in an FPGA. I have a 6809 VHDL core running the Flex operating 
> system.
> > > http://members.optushome.com.au/jekent/FPGA.htm
> > 
> > Several people have talked about it but I don't know if any are
> > working on it.  I considered it but the VDG would be kinda time 
> consuming.
> > If there were a 6847 clone in VHDL it would be easy.




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