On Sat, 4 Jan 2014, pedro wrote:

On Fri, 03 Jan 2014 21:11:03 -0500, Donald
wrote:

If there is an internal memory cell battery, you might disconnect
power from it by removing it for 10 minutes then reinstalling it to
see if that resets it.

I found some information on modding it. Maybe going through these
keypresses might shock it back to normal?
(snip)

And how may that help the O/P who has a C510?

I was making a joke, but apparently didn't remember the right model
number.

I was thinking of way back when Standard first put out a walkie talkie,
crystal controlled and only a few channels, but cheaper than buying a
Motorola HT on the surplus market, if I remember properly. The woman on
the cover of the September or October 1972 issue of "73" is holding one,
if it's the September issue it was the first issue of "73" that I saw.

It preadated by most of a decade the units that included synthesizers, so
there'd be no CPU (not that the early generations of synthesized walkie
talkies had CPUs).

Michael