Sony PEG-TG50 - Manual (Page 18)

Calculator Settings
powerOne™ Personal 15
places: the number of significant digits displayed is 1+ the decimal
setting.
Display Mode
There are three display modes: normal, scientific and engineering. In
normal mode, numbers appear as they are entered. In scientific mode,
numbers are always displayed in scientific notation and likewise, in
engineering mode numbers are always displayed in engineering
format.
Trig Mode
When using trigonometric functions, either degrees or radians can be
used. Choose which mode by selecting one of the two. In radians
mode, ‘rad’ will appear in the lower part of the view window,
otherwise 'deg' will appear.
Use Calc Button
By checking this box, the application will become the default
calculator. Once checked, selecting the calculator button in the top,
right-hand corner of the Graffiti input area will display this calculator.
Default Settings
To return the preferences to their default settings, choose the Default
button next to Done.
Programmable Buttons
Some add-on skins offer programmable buttons, which can be set to
any function or template in the calculator. See the section on
Skins/Personalized Displays for more details.