[Coco] What about the double speed upgrade?

[L. Curtis Boyle]

On Thu, 04 Jan 2007 22:49:25 -0600, John Kowalski <sock at axess.com> wrote:

> At 06:04 PM 04/01/2007 -0600, L. Curtis Boyle wrote:
>>     Sock's (and Bob Puppo's before him) clock doublers only double the
>> speed when the CPU is not accessing RAM. So, you are right, in 6309  
>> native
>> mode, where the chip caches the instruction byte, you don't see as much  
>> of
>> a gain (except on many cycle CPU instructions that don't touch RAM, like
>> DIVx and MULD instructions). On things like TFM, it won't speed up at  
>> all.
>
> Bob Puppo designed one too?  There was *yet another* guy who was trying  
> to
> do something similar at the time that I was doing mine too.  His
> idea/approach was very different from mine, so the performance would have
> been very different.  I don't know if he actually did build it, though.
>
> Does anyone know how Bob's design would have worked and how much it  
> affected
> CPU performance?  Was it sold?
>
>                                          John Kowalski (Sock Master)
>                                          http://www.axess.com/twilight/sock/
>
>
    It was originally done on a Coco 3 around 1989, I think. It was part of  
the original design of the TC-9 (later ditched because it require too much  
tweaking on each manufactured board).


-- 
L. Curtis Boyle