*** Quoting Craig Ford to Rick Collins dated 04-24-97 ***
> Alas, that really isn't going to tell you if a given device has NVRAM. 
> Some of the new low-cost designs have no NVRAM (eg. SupraExpress), and 
> respond with an "OK" to both ATZ and AT&W commands.
> 
Perhaps, but all one needs to do is go full circle.  
Do an ATZ.  Look at the registers.  Change one.
Look again.   Then do ATZ and see if it changes 
back.   One could go one step further if this 
worked.  Do the ATZ.  Change a register.  Do AT&W.
Change it back.  Then do ATZ.  See if it is changed
again.  Simple and certain.  (I think )
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