While a 4MHz device will often run at higher clocking rates than
     specified, you cannot assume that the same will carry forward for a
     10MHz device.

     Hint, how many actually different pieces of silicon do you think are
     represented by all of those different part numbers?

     Rgds, Brian.


______________________________ Reply Separator _________________________________
Subject: Re: Overclocking the '84
snip snip
> I think this brief experiment shows that 4MHz parts can at least
> be used for development work at 10MHz, and that possibly 4MHz
> parts can be used at interim clock rates (say 6-8MHz ?) quite
> reliably.
> I'd be interested if anyone else has carried out similar
> tests, it did occur to me that if a 4MHz part operates at
> 2 and 1/2 times its rated clock rate then a 10MHz part
> should be capable of at least 12-15MHz in restricted
> environmental and power supply conditions!