[Coco] ceramics ...

[jdaggett at gate.net]

Mark

We used 68B09's at clock speeds of 12 MHz, 3 MHz buss speed 
24/7 for months on end. Had little fail ure from that. 

Yes it is quite possible to operate an 8 MHz 68K at 14 MHz. Again it 
may be necessary to heat sink the chip though. 

james



On 3 Sep 2004 at 15:36, mmarlett at isd.net wrote:

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Date sent:      	Fri, 3 Sep 2004 15:36:12 -0500
Subject:        	Re: [Coco] ceramics ...
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> Kevin,
> 
> I doubt that the Motorola parts will run at 14+MHZ if they are spec'd
> at 8MHZ.
> 
> I remember your project(s), not that I don't care for them. Just not
> for me. I have done what you are trying to do and it is not a project
> to start on. Walk before you can run. That is all. I'm all for as many
> CoCo projects as people will do. GREAT machine to learn from. The
> board is only a small part of the project. When I get to that part, I
> know I'm very close to being done. Most of the work is done in the
> homework and design stage. Follow the layout rules, terminate,
> impedance match and it will work as designed.
> 
> Mark
> Cloud-9
> 
> 
> 
> 
> 
> 
> >Mark,
> >
> >	The parts are speced at 8.
> >
> >	I already told you about the project idea. I don't think you liked
> >it. "CPU Paks" I would love to have a program pak with a 68000, or an
> >80186, or a TI9900, or a 6502, or ... . I have no idea how to do the
> >board. Any suggestions.
> >
> >	And of course without a job none of this is going anywhere.
> >
> >					kevin
> >
> >Mark Marlette wrote:
> >> At 9/2/2004 09:04 PM -0700, you wrote:
> >> 
> >> Kevin,
> >> 
> >> Most parts have a designed clock that they were certified at and
> >> assigned when they were tested at their manufactured date. What are
> >> those clock speeds of the said chips? Seems to me to be a data book
> >> look
> 
> >> up process. If theory doesn't work for you then just hook them up
> >> and try them out at the speed you want them to run. A bit of work
> >> since they
> 
> >> are just chips and require a bit of work to connect up and test.
> >> Let us know what you find out though. Have some plan(s) for a new
> >> CoCo project here?
> >> 
> >> Mark
> >> Cloud-9
> >> 
> >> 
> >>> Hi,
> >>>
> >>>         No hardware. Just a pair of chips. So the question refers
> >>>         to 
> >>> them. Think they would run at 14.3181818?
> >>>
> >>>                                   kevin
> >>>
> >>> Mark Marlette wrote:
> >>>
> >>>> At 9/2/2004 11:57 AM -0700, you wrote:
> >>>> Kevin,
> >>>> Overclocking is generally not a good thing to do but it depends
> >>>> what you are trying to do. For instance, overclocking the CoCo3
> >>>> is not a good thing due to the GIME. Can you tell us a bit more
> >>>> about the hardware that these CPUs are connected to? Regards,
> >>>> Mark Cloud-9
> >>>>
> >>>>> Hi,
> >>>>>
> >>>>>         I have a 68010 and a 68008. They are both 8s. Any
> >>>>> thoughts as to how high they could be SAFELY overclocked?
> >>>>> The plain 6809e in my deuce seems to run fine at 1.7 for
> >>>>> extended periods. But it does have a heat sink.
> >>>>>
> >>>>>                                   kevin
> >>>>>
> >>>>> Stephen H. Fischer wrote:
> >>>>>
> >>>>>> Hi,
> >>>>>> I thought I had one, but it is a 6800. I found a 6820 and a
> >>>>>> 8008.
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>> -- 
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> >>>>
> >>>>
> >>>
> >>>
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> >> 
> >> 
> >> 
> >> 
> >
> >
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