[Coco] Re: Coco Digest, Vol 23, Issue 34

[farna at att.net]

The big problem with running a CoCo at higher than normal speeds is timing for everything else, especially the GIME and disk access. I programmed around that in the genealogy program I wrote by poking up at the start of the program and poking down/up before/after every disk access. There are some advantages to non-multi tasking systems! I don't recall if the disk functiuon was fixed in the CoCo3 or there was a hack for it, but do recall the GIME having problems over 2 MHz.

--
Frank Swygert
Publisher, "American Independent 
Magazine" (AIM)
For all AMC enthusiasts
http://farna.home.att.net/AIM.html
(free download available!)
			

 -------------- Original message ----------------------


> Message: 1

> Date: Thu, 11 Aug 2005 22:21:41 -0600

> From: "L. Curtis Boyle" <curtisboyle at sasktel.net>

> Subject: Re: [coco] 6309 speed

> To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>

> Message-ID: <op.svdnqfxsmuougd at l-curtis-boyles-computer-2.local>

> Content-Type: text/plain; format=flowed; delsp=yes; charset=iso-8859-1

> 

>      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