I never knew those calculators by model number, but it sound like you are 
talking about the first one that was only a calculator; no clock.

It seems like the mode key set the top row to do different stuff.  In one of 
the modes, four keys on the top were for the memory: plus, minus, add to, 
and recall.  Of course the last one turned it off; the recessed one below it 
turned it on and cleared it.

The Other Howard, WA9RYF

----- Original Message ----- 
From: "Butch Bussen" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, March 09, 2012 8:58 PM
Subject: Re: keys on sharp 620


> yes, the 620.  I figured it out.  The left button is a mode key and the
> next shuts speech off and the next two to the right turn it on, one it
> speaks the numbers 1 2 3 and the other it says one hundred twenty three.
>
> 73
> Butch
> WA0VJR
> Node 3148
> Wallace, ks.
>
>
> On Fri, 9 Mar 2012, Harvey Heagy wrote:
>
>> Are you speaking of the calculator only without the clock?
>> Harvey
>>
>>