[coco] 6309 speed

[jdaggett at gate.net]

Curtis

WHere I used to work we used 68B09 based boards that were using 
a 12MHz crystal. These were r unning 24/7 on the factory floor for 
months at a time with no problems.

That correlates to a buss frequency of 3 MHz.

james

On 11 Aug 2005 at 22:21, L. Curtis Boyle wrote:

Date sent:      	Thu, 11 Aug 2005 22:21:41 -0600
From:           	"L. Curtis Boyle" <curtisboyle at sasktel.net>
Subject:        	Re: [coco] 6309 speed
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>      When Kevin Darling originally started talking about the 6309 on

>      the  

> newsgroups (you can find the original articles on Google's

> newsgroups), he  mentioned that several people had them running from 4

> to 5 MHz reliably. I  know I had the 68B09 running at 2.25 MHz with a

> clock crystal upgrade,  although it popped my Magnavox 8515 monitor at

> the time (downclocked it  back to 2Mhz (real, not the 1.78MHz stock

> Coco 3's run at) after that).  Ran perfectly reliably then, and one of

> my Coco 3's in storage is still at  a true 2MHz, and ran that way for

> years.

> 

> On Wed, 03 Aug 2005 09:09:18 -0600, <jdaggett at gate.net> wrote:

> 

> > Gene

> >

> > I seriously doubt that 20 to 30 MHz speeds could be obtained. At

> > least  not operating at 5VDC.  Maybe at 6.5 VDC. More realistic is 5

> > to 10 MHz. The problem  wil lbe not all will do that. Maybe 1% of

> > all 6309 will do 10MHz. Maybe 50% will do  5 MHz.

> -- 

> L. Curtis Boyle

> 

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