Sharp OZ-640 - Manual (Page 56)

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3. Press [C·CE] to clear the original rate first. Then enter the
rate 0.45.
* Make sure that a maximum of 10 digits can be entered.
4. Press [ ] to move to the currency name field and then
change what you want.
Example: C$ STR£
A maximum of seven characters can be entered on each side.
5. Press [ENTER] when you have finished (or [CANCEL] to
cancel the changes).
If you want to set another currency exchange rate, start again
from step 2 above. You can use each currency conversion at
any time once it has been set.
Performing a conversion
For example, you want to find out how many liters there are in
10 gallons:
1. Press [CALC/CONV] twice until the Conversion index
display appears.
2. Press [PREV] or [NEXT] to move through three conversion
index groups until you find out the units conversion of
volume.
3. Select gal l and then press [ENTER].