[Coco] ceramics ...

[Mark Marlette]

At 9/3/2004 10:25 PM -0400, you wrote:

james,

Again I'm sure it is possible but why? Buy the rated chip and operate it as 
it was designed. Not like you can't purchase one at that speed. A different 
story when you want to operate a 2MHZ part at 12MHZ, you have no options, 
so you do it, take the risk.

My experience has been, run at rated or slightly higher. Make 25%+ 
increases and look out.

Why do you think that the manufacture rates the chip as they do? May be we 
should forward this to them so that they can reevaluate how they rate their 
IC's. They could charge more $$$$ for them. Why make/sell a 16MHZ part when 
the consumer can use a 8MHZ part and a heat sink?

mark



>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:
>
>From:                   mmarlett at isd.net
>To:                     coco at maltedmedia.com
>Date sent:              Fri, 3 Sep 2004 15:36:12 -0500
>Subject:                Re: [Coco] ceramics ...
>Send reply to:          mmarlett at isd.net,
>         CoCoList for Color Computer Enthusiasts
><coco at maltedmedia.com>
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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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