Psion Revo Palmtop Computer Instructions Manual

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Time
Adding a country
To add a country which is not included in the Map
view:
1.Select the Add country command from the Edit
menu.
2.Type the country’s name; its national dialling
code; its national dialling prefix, i.e. the digit(s)
that needs to be dialled immediately prior to
each city area code when telephoning from one
city to another within the country; and its
international dialling prefix.
3.Each country must have a capital city, and a
dialog is displayed to create one. See the
previous...

122
Time
Setting summer time
If you are not interested in making use of world
times, and are happy to use the Time & date
command to change the time when clocks go
forward or back, you can ignore this section.
However, if you travel or wish to be precise about
world times, you should set your own time to ‘winter
time’ (in the UK, this is GMT), and modify the
‘summer time’ setting when the clocks go forward or
back.
You can also take into account the ‘summer times’
used in the different areas of the...

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Time
Time.p6503/02/2000, 15:06 123 

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Calc
Calc
·The Scientific view is a scientific calculator with
26 memories. Use this for more advanced
calculations, including those that involve
trigonometry or logarithms.
When you first use Calc, it displays the Desk
calculator. To move between the views, tap the Desk
or Sci buttons on the Toolbar, or use the Switch
view command from the View menu.
Till roll
Desk view
Calc is the calculator program. It has two views: Desk
and Scientific. The two calculator views are separate,
so you can carry out...

125
Calc
Note: You may find the display suits your style of
working better when it is “flipped”, i.e. when the left
and right sides of the screen are swapped over. To
do this, tap Flip layout on the Toolbar, or use the
command on the View menu.
The Desk calculator
To perform a calculation in the Desk calculator view:
1.Enter your calculation by tapping the number and
operator buttons (+, -, × and ÷) on screen, or
using the keyboard equivalents. There is no
“operator precedence” in the Desk view, so all...

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Calc
Percentage calculations
To perform percentage calculations, use % on the
Desk calculator.
·To calculate 40% of 60: enter 60×40, then tap %.
·To increase 60 by 40%: enter 60+40, then tap %.
·To decrease 60 by 40%: enter 60-40, then tap %.
·To calculate what % 60 is of 200: enter 60÷200,
then tap %.
·To find the number that 60 is 40% of: enter
60÷40, then tap %.
You can use a combination of the memory and the
percentage facility, e.g. for tax calculations. If you have
the rate of taxation stored...

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Calc
Operator precedence
The order in which individual elements of a
calculation are performed is called “operator
precedence”. In the Scientific view, the operator
precedence is as follows (highest first):
·Information in brackets.
·Functions which follow the value to which they
refer, e.g. x!
·Powers.
·Implicit multiplication before a memory value, i.e.
30A.·Prefix functions which precede the value they
refer to, e.g. sin.
·Implicit multiplication before prefix function, such
as 5sin30, or before...

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Calc
Re-using answers and calculations
In the Scientific view you can re-use the answer from
your last calculation.
·To insert the last answer at any point in a
calculation: tap the Ans button at the appropriate
point. The calculator will insert ‘Ans’ in the
calculation line, representing the last result.
·To start a new expression with the last answer:
just enter the rest of the expression as though
the answer was already written at the start. The
calculator will prefix the expression with ‘Ans’....

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Calc
·To display the contents of the memories: tap the
Mem button, or select Show all from the
Memories commands on the Tools menu.
·To use a stored number in a calculation: type the
capital letter corresponding to the memory, or
tap the Mem button and select the memory you
want.Note: You can assign values to the memories in any
order you like, so use the names as a reminder of the
information they contain. For example, use the ‘T’
memory for a rate of taxation, or ‘Y’ for the rate of
exchange into...

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Calc
·To calculate the cube root of a number: tap 
3Ö ÖÖ Ö
Ö,
enter the number, then tap =.
·To find the x root of a number: enter the
number of the root you want to find, e.g. 4 for
the fourth root. Tap 
xÖ ÖÖ Ö
Ö, enter the number you
want to find the x root of, then tap =.
·To calculate the reciprocal (1/x) of a number:
enter the number, tap x-1, then tap =.
Trigonometric functions
·To calculate the sine, cosine or tangent of a
number: tap sin, cos or tan; enter the number
and tap =.
·To calculate...