[coco] 6309 speed

[Gene Heskett]

On Wednesday 03 August 2005 00:55, RJRTTY at aol.com wrote:
>    Does anybody know or has anybody tried to find the top
>speed of the 6309?   If they have been made with updated
>processes shouldn't they be capable of higher clock speeds?
>Even if Hitachi rates them at 1-3 Mhz has anybody actually
>tried them to see how fast they can go?
>
>Roy

Having looked at the waveforms coming out of it and finding that edge 
transitions are in the 10 nanosecond territory, my guess is that it 
could probably go quite a it faster, possibly as high as 20-30 mhz.  
The only thing that would worry me is that there are some glitches on 
the address lines that would, if they occur a fixed time after a 
clock transition, begin to impinge on the memories 'setup' time when 
the clock speeds rise.

Obviously to me, the gime chip would be the speed limiting factor.

Sockmaster has a circuit that runs it at 2x normal clocking for those 
non-memory access cycles.  If I were to build this, I might crank it 
up even more, but in the coco, (or coco3) with its married to the 
video gime or 6847 to deal with, 2x is probably the practical limit.
That, the 6309 I have could do and still run at room temperature.  
Mine has an external psu, and in a 24/7 situation, only has a rise of 
about 2 degrees, over the 2 megs of ram in it, even if you throw a 
blanket over the whole thing.

Change of subject:

Since I'm here,and posting to maltedmedia, George Ramsower seems to 
have dropped off somehow, and I'm getting bounce messages listing his 
address as 'no such recipient' at Ramsower at five.pairlist.net.
Dennis, can you take a look please?

-- 
Cheers, Gene
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
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