[Coco] CoCo 4 - the dream continues...

[jdaggett at gate.net]

Fedor

CPU09 is Joghn Kent's MC6809 VHDL core that can be compiled and loaded into a 
Xilinx Spartan series FPGA. It needs to be at least a 200K gate equivalent part or 
larger.  Currently John has the core running at 12.5MHz buss speed. From static 
timing after compilation it looks as if the core may run as fast as 19MHz buss 
speed. Simulation and/or actual tests may bear that out. Still a 12 to 15 MHz CPU 
would be heavenly. I plan on verifying the max speed shortly. 

One reason I would like to  have an HD63484 is to build a prototype so that I can 
verify the graphics portion if I decided to redo it in an FPGA. It is always nice to 
compare a gainst a running model as opposed to a spec sheet. Better to do side by 
side comparison of working boards. 

Most of the obsolete and surplus vendors are legit. Most of the web sites have no 
stock, they function as brokers for those that have surplus stock that don't want to 
scrap their inventory. So instead you may find as little as 4 or 5 to as many as 1,000 
pieces. What will happen is you have to buy the whole lot in most cases.  Naturally 
they tack on a fee to compensate their efforts. These can be a bit  hefty. 

james


On 22 Jun 2006 at 21:41, Fedor Steeman wrote:

> Well, a quick search on the internet gave me a datasheet that I downloaded,
> and several links that claim that these chips are available. But whether the
> latter are scams or only allow huge orders I cannot tell...
> 
> What is the CPU09? I have never heard of that... Sounds exciting? A
> 6809-compatible programmed chip or something?
> 
> Is it at all possible to exploit the capabilities of the HD63484 at only
> 2MHz?
> 
> Fedor
> 
> On 22/06/06, jdaggett at gate.net < jdaggett at gate.net> wrote:
> >
> > Fedor
> >
> > I would love to know where I could gain access to a few HD63484s?
> > Preeferably the 9.8 MHz. version. With that chip the RSBASIC
> > could be rewritten and probably reduced in size to allow for more
> > functions in the 32K ROM package.
> >
> > At least with that chip you now have a simple but effective graphics
> > processor with VGA capabilities. Take John Kent's CPU09 soft
> > processor and incorparate it with the HD63484 and you have a nice
> > base for a Coco3 that should have been. Much of the graphic
> > commands that are in software are now apart of the graphics chip.
> >
> > james
> >
> > On 22 Jun 2006 at 14:21, Fedor Steeman wrote:
> >
> > > Just expanding a bit on SockMaster's excellent idea for a CoCo4 (
> > > http://www.axess.com/twilight/sock/cocofile/coco4.html).
> > <http://www.axess.com/twilight/sock/cocofile/coco4.html%29.>..
> > >
> > > Would it be possible to stick only 2 6309 4Mhz cards on the 16 Mhz main
> > > board and have the other two slots occupied by a single graphics card
> > > running at 8Mhz, and sporting, say, a HD63484? Now then you would have
> > some
> > > awesome graphics capabilities!
> > >
> > > I am sorry, just me daydreaming... ;-)
> > >
> > > Cheers,
> > >
> > > Fedor
> > >
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