My bet thet it was the ross-cypress (SM30 ??) probably THE slowest 4m around. 
It was the original dual cpu on the 600smp. It was so slow that even sun 
replaced them all. The ss2 had a 4c.and runs at 40mhz, I think the original 
ross-cypress was at 30-36mhz. The Ross-cypress might have used the 4c core 
with the mbus.

Cheer

Tom
matthew green wrote:
>    
>    
>    matthew green wrote:
>    >    
>    >  
>    > 
>    > note that there is one sun4m machine that uses a v7 cpu :-)
>    > 
>    Well, don't keep me in suspense.. Which one? I probably have it.
> 
> 
> hmmmm... i think it was one of the early 4/600?  it had the same
> cpu as the SS2 IIRC.... 
> 
> 
> .mrg.
> 

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