Rock Wrote

>  I would be very appreciative to learn what others
> have done when needing extensive user input.
>

For a DDS based system with frequencies assigned to
keys, we used a separate hand held unit that the
frequencies were entered into, viewed on an LCD and
loaded onto an 8 pin EEPROM.
This IC was then plugged into the DDS unit and this was
read at power up by the unit and new freq's were
assigned to the keys.
This also had the advantage that the field research unit
(the target application) was NOT programmable and
removed one more idiot factor.
A power switch and 10 keys, one for each freq was more
than enough trouble.

If there was a screw up, the old IC was put back in and it
worked again.


_____________________________

Lance Allen
Technical Officer
Uni of Auckland
Psych Dept
New Zealand

www.psych.auckland.ac.nz

_____________________________