Handspring Treo 90 Handheld User Guide

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Trigonometry buttons
Finance buttons
Finance buttons enable you to find an unknown variable value based on a group of known variable 
values. For example, to calculate the monthly payment for a 30-year home loan of $100,000 with 
an annual interest rate of 8%, you would enter the following variables:
nPayments/year = 12
nN = 360 (30 years x 12 months)
nAPR = 8
nPV = 100,000
nFV = 0
Using these variables, the answer would be -733.76 per month.
To solve this example:
1. Enter a value and then tap the corresponding variable button. Repeat this process until you’ve 
entered the following four variables: 
nN = 360 (30 years x 12 months)
nAPR = 8Calculates the sine of the current number.
Calculates the cosine of the current number.
Calculates the tangent of the current number.
Calculates the hyperbolic sine of the current number.
Calculates the hyperbolic cosine of the current number.
Calculates the hyperbolic tangent of the current number.
Calculates the arc (inverse) sine of the current number.
Calculates the arc (inverse) cosine of the current number.
Calculates the arc (inverse) tangent of the current number.
Calculates the arc (inverse) hyperbolic sine of the current number.
Calculates the arc (inverse) hyperbolic cosine of the current number.
Calculates the arc (inverse) hyperbolic tangent of the current number. 
						

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nPV = 100,000
nFV = 0
2. Enter 12 and tap the P/Yr button to enter the number of payments per year.
3. Tap Edit.
4. Tap the Pmt line and erase all values on the line including zero.
5. Tap Solve.
6. Hold Option   and press Return   to finish.
You can use a similar process to solve other financial equations by entering four of the variables 
to find the value of the fifth variable.
Stores the current number as the total number of payments over the life of the 
loan.
Stores the current number as the annual percentage rate of interest.
Stores the current number as the number of payments per year.
Stores the current number as the initial loan amount.
Stores the current number as the payment amount.
Stores the current number as the compounded loan amount including interest.
Opens the Time Value of Money dialog box where you can modify values and solve 
the equation.
Stores the remaining balance, interest, and principal (amortization) based on the 
supplied values.
Calculates a given percentage of a value. To use this button, enter a value, tap this 
button, enter the percent, and then tap the equal sign button. 
Calculates the change in a value by a given percentage. To use this button, enter 
a value, tap this button, enter the percent, and then tap the equal sign button.
Calculates the percentage of one number relative to another number. To use this 
button, enter the first number, tap this button, enter the second number, and then 
tap the equal sign button.
Calculates the percentage required to get to one value from another value. To use 
this button, enter the result number, tap this button, enter the starting number, and 
then tap the equal sign button. 
						

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Logic buttons
Statistics buttons
Shifts the value to the left and fills the new places with zeros.
Enters D in a hexadecimal calculation.
Enters E in a hexadecimal calculation.
Enters F in a hexadecimal calculation.
Calculates bit-by-bit commonalities between two arguments.
Calculates bit-by-bit unique occurrences in two arguments.
Shifts the sign bit to the right in signed mode.
Enters A in a hexadecimal calculation.
Enters B in a hexadecimal calculation.
Enters C in a hexadecimal calculation.
Calculates the inverse of each bit of the argument.
Calculates the exclusive OR between two arguments.
Adds the current value to the end of the statistics memory list. You can store up 
to 200 values.
Calculates the mean of the values in the statistics memory list.
Calculates the standard deviation based on a population of
 n.
Calculates the standard deviation based on a population of
 n-1.
Calculates the sum of the values in the statistics memory list.
Calculates the square of the sum of the values in the statistics memory list.
Opens the Statistical Data dialog box where you can view, edit, delete, and clear 
values in the statistics memory list.
Displays the number of values in the statistics memory list.
Calculates the factorial of any integral from 0 to 170. 
						

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Weight/Temp buttons
Length buttons
Generates a random number between 0 and 32767 and then divides this number 
by 32768 to generate a random fraction between 0 and .99997.
Returns the number of combinations of 
n items taken m at a time.
Returns the number of permutations of 
n items taken m at a time.
Indicates the current value is entered in ounces. When you tap this button after 
tapping another unit of measure, it converts the value to ounces.
Indicates the current value is entered in pounds. When you tap this button after 
tapping another unit of measure, it converts the value to pounds.
Indicates the current value is entered in US tons. When you tap this button after 
tapping another unit of measure, it converts the value to US tons.
Indicates the current value is entered in UK tons. When you tap this button after 
tapping another unit of measure, it converts the value to UK tons.
Indicates the current value is entered in milligrams. When you tap this button after 
tapping another unit of measure, it converts the value to milligrams.
Indicates the current value is entered in grams. When you tap this button after 
tapping another unit of measure, it converts the value to grams.
Indicates the current value is entered in kilograms. When you tap this button after 
tapping another unit of measure, it converts the value to kilograms.
Indicates the current value is entered in metric tons. When you tap this button 
after tapping another unit of measure, it converts the value to metric tons.
Indicates the current value is entered in degrees Fahrenheit. When you tap this 
button after tapping another unit of measure, it converts the value to degrees 
Fahrenheit.
Indicates the current value is entered in degrees Kelvin. When you tap this button 
after tapping another unit of measure, it converts the value to degrees Kelvin.
Indicates the current value is entered in degrees Celsius. When you tap this button 
after tapping another unit of measure, it converts the value to degrees Celsius.
Indicates the current value is entered in inches. When you tap this button after 
tapping another unit of measure, it converts the value to inches.
Indicates the current value is entered in feet. When you tap this button after 
tapping another unit of measure, it converts the value to feet.
Indicates the current value is entered in yards. When you tap this button after 
tapping another unit of measure, it converts the value to yards.
Indicates the current value is entered in miles. When you tap this button after 
tapping another unit of measure, it converts the value to miles. 
						

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Area buttons
Indicates the current value is entered in nautical miles. When you tap this button 
after tapping another unit of measure, it converts the value to nautical miles.
Indicates the current value is entered in millimeters. When you tap this button after 
tapping another unit of measure, it converts the value to millimeters.
Indicates the current value is entered in centimeters. When you tap this button 
after tapping another unit of measure, it converts the value to centimeters.
Indicates the current value is entered in meters. When you tap this button after 
tapping another unit of measure, it converts the value to meters.
Indicates the current value is entered in kilometers. When you tap this button after 
tapping another unit of measure, it converts the value to kilometers.
Indicates the current value is entered in square inches. When you tap this button 
after tapping another unit of measure, it converts the value to square inches.
Indicates the current value is entered in square feet. When you tap this button 
after tapping another unit of measure, it converts the value to square feet.
Indicates the current value is entered in square yards. When you tap this button 
after tapping another unit of measure, it converts the value to square yards.
Indicates the current value is entered in acres. When you tap this button after 
tapping another unit of measure, it converts the value to acres.
Indicates the current value is entered in square miles. When you tap this button 
after tapping another unit of measure, it converts the value to square miles.
Indicates the current value is entered in square millimeters. When you tap this 
button after tapping another unit of measure, it converts the value to square 
millimeters.
Indicates the current value is entered in square centimeters. When you tap this 
button after tapping another unit of measure, it converts the value to square 
centimeters.
Indicates the current value is entered in square meters. When you tap this button 
after tapping another unit of measure, it converts the value to square meters.
Indicates the current value is entered in hectares. When you tap this button after 
tapping another unit of measure, it converts the value to hectares.
Indicates the current value is entered in square kilometers. When you tap this 
button after tapping another unit of measure, it converts the value to square 
kilometers. 
						

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Volume buttons
Creating a custom view
You can modify any existing Advanced Calculator view to create your own view. While 
customizing a view, you can change the button names as well as the button definitions.
To create a custom view:
1. From the Advanced Calculator screen, press Menu  .
2. Under Program, select Export (/E).
3. Tap the pick list and select the view you want to modify.
4. Tap Export.
5. Hold Option   and press Return   twice. 
6. In Memo Pad, open the memo containing the definition you selected in step 3.
7. Modify the definition, and then hold Option   and press Return  .Indicates the current value is entered in teaspoons. When you tap this button after 
tapping another unit of measure, it converts the value to teaspoons.
Indicates the current value is entered in fluid ounces. When you tap this button 
after tapping another unit of measure, it converts the value to fluid ounces.
Indicates the current value is entered in cups. When you tap this button after 
tapping another unit of measure, it converts the value to cups.
Indicates the current value is entered in pints. When you tap this button after 
tapping another unit of measure, it converts the value to pints.
Indicates the current value is entered in quarts. When you tap this button after 
tapping another unit of measure, it converts the value to quarts.
Indicates the current value is entered in gallons. When you tap this button after 
tapping another unit of measure, it converts the value to gallons.
Indicates the current value is entered in tablespoons. When you tap this button 
after tapping another unit of measure, it converts the value to tablespoons.
Indicates the current value is entered in milliliters. When you tap this button after 
tapping another unit of measure, it converts the value to milliliters.
Indicates the current value is entered in liters. When you tap this button after 
tapping another unit of measure, it converts the value to liters.
Indicates the current value is entered in cubic inches. When you tap this button 
after tapping another unit of measure, it converts the value to cubic inches.
Indicates the current value is entered in cubic feet. When you tap this button after 
tapping another unit of measure, it converts the value to cubic feet.
Indicates the current value is entered in cubic meters. When you tap this button 
after tapping another unit of measure, it converts the value to cubic meters. 
						

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8. From the Advanced Calculator screen, press Menu  .
9. Under Program, select Import (/I).
10. Tap the pick list and select the view you modified.
11. Tap Import.
12. Tap Replace to change an existing definition, or tap Add to create an additional definition.
13. Hold Option   and press Return   twice to finish.
Calculator menus
Calculator menus are shown here for your reference, and Calculator features that are not 
explained elsewhere in this guide are described here. See page 33 for information about 
choosing menu commands.
Options menus
Program menu
About CalculatorShows version information for Calculator.
ExportOpens the Export dialog box where you can select a view definition to export 
to Memo Pad.
ImportOpens the Import dialog box where you can select a view definition to import 
to Memo Pad.
Delete ViewOpens the Delete View dialog box where you can delete a user-defined view.
Restore 
DefaultsReturns all the view definitions to the preset default values.
Basic CalculatorAdvanced Calculator
Advanced Calculator 
						

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Expense
Expense enables you to record the date, expense type, and the amount that you spent. A record 
in Expense is called an “item.” You can sort your Expense items into categories or add other 
information that you want to associate with the item.
To create an Expense item:
1. Press Option   and then press Menu   to access the Applications Launcher. 
2. Tap the Expense icon  .
3. Enter the amount of the expense. 
4. Tap the Expense type pick list and select a type from the list.
Note: As soon as you select an expense type, your handheld saves the entry. If you don’t select 
an expense type, it doesn’t save the entry.
Tip: A quick way to create a new Expense item is to make sure that no Expense item is 
selected in the Expense list, enter the first letter(s) of the expense type, and then enter 
the numerical amount. This technique takes advantage of the automatic fill feature. See 
the section that begins on page 134 for details.
Changing the date of an Expense item
Initially, Expense items appear with the date you enter them. You can use Expense to change the 
date associated with any Expense item.
Tap NewCursor 
of new 
item
Tap here 
						

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To change the date of an Expense item:
1. Tap the Expense item you want to change.
2. Tap the date of the selected item. 
3. Select the new date.
4. Hold Option   and press Return   to finish.
Entering receipt details
Expense provides a variety of options that you can associate with an item. These options appear 
in the Receipt Details dialog box.
To open the Receipt Details dialog box:
1. Tap the Expense item to which you want to assign details.
2. Tap Details.
 
3. Select any of the following options:
CategorySee the section that begins on page 65 for details.
TypeOpens a pick list of expense types. 
PaymentLets you choose the payment method used to pay the Expense item. If 
the item is prepaid (such as airline tickets supplied by your company), 
you can choose Prepaid to place your expense in the appropriate 
company-paid cell of your printed expense report spreadsheet. See the 
section that begins on page 132 for more information.
Tap date 
						

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4. Hold Option   and press Return   to finish.
Customizing the Currency pick list
You can select the currencies and symbols that appear in the Currency pick list.
To customize the Currency pick list:
1. In the Receipt Details dialog box, tap the Currency pick list and select Edit currencies.
2. Tap each Currency pick list and select the country whose currency you want to display on that 
line.
3. Hold Option   and press Return   twice to finish. 
Defining a custom currency symbol
If the currency you want to use is not in the list of countries, you can create your own custom 
country and currency symbol. 
To define a custom currency symbol:
1. Press Menu  .
2. Under Options, select Custom Currencies. (/Y)
3. Tap one of the four Country boxes.CurrencyEnables you to choose the type of currency used to pay the Expense 
item. The default currency unit is defined in the Preferences dialog (see 
page 134). You can also display up to four other common types of 
currency. see the next section in this chapter for more information.
Vendor and CityLets you record the name of the vendor (usually a company) associated 
with the expense and the city where the expense was incurred. For 
example, a business lunch might be at Rosies Cafe (Vendor) in San 
Francisco (City).
AttendeesSee the section that begins on page 71 for details.
Tap Edit 
currencies