Texas Instruments BA-35 Solar Quick Reference Guide
BA-35 Solar Quick Reference Guide
Table of Contents
General Information ..... 2
The Display ..... 4
Arithmetic Operations ..... 6
Correcting Errors ..... 7
Display Formats ..... 8
Memory Operations ..... 9
Math Operations ..... 10
Percentage Calculations ..... 12
Percentage Change Calculations ..... 13
Margin and Markup Calculations ..... 14
Compound Interest Calculations ..... 16
Annuity Calculations ..... 18
Converting to EFF or APR ..... 23
Balance, Interest, and Principal ..... 24
Statistics ..... 27
Common Keystroke Sequences ..... 30
Error Conditions ..... 35
In Case of Difficulty ..... 37
TI Product Service and Warranty Information ..... 38
© 1996 by Texas Instruments Incorporated
General Information
Turning the Calculator On and Off
AC/ON (All Clear/On)—Turns on the calculator.
This key also clears the display, all pending operations, and values in memory or the mode registers.
The calculator turns off automatically when the solar cell panel is no longer exposed to light.
Modes
The calculator can operate in three different modes. Setting the calculator to a particular mode prepares it to perform special functions. The available modes are statistics, financial, and profit margin.
Indicators in the display tell you the calculator's current mode. STAT displays for statistics, FIN for financial. No indicator is displayed for profit margin mode.
MODE—Changes the calculator to the next mode in sequence. To set the calculator to a particular mode, press MODE repeatedly until the appropriate indicator is displayed.
Changing to a new mode clears the contents of the mode registers.
You can do arithmetic, mathematical, and percentage operations in any mode.
Second Functions
$ ^{2nd} $ (Second Function)—Enables you to perform the “second” functions that are marked over some of the keys. To perform a second function, press $ ^{2nd} $ and then the appropriate function key.
When you press $ [2^{nd}] $, 2nd appears in the display until you press another key.
If you press $ \mathbf{2nd} $ and then a key that does not have a second function, the key performs its normal function. If you accidentally press $ \mathbf{2nd} $, press it again to cancel its effect.
Clearing the Calculator
AC/ON (All Clear/On)—Clears the calculator completely, including the display, all pending operations, and the memory and mode registers. Pressing AC/ON also sets the calculator to floating-decimal format and financial mode.
CE/C (Clear Entry/Clear)—Clears incorrect entries, error conditions, the display, or pending operations. It does not affect the memory, the mode registers, or the display format.
2nd [CMR] (Clear Mode Registers)—Clears any values that have been stored in the mode registers.
Note: Changing to a new mode also clears the contents of the mode registers.
The Display
The display shows a maximum of 10 digits, although the calculator internally retains a maximum of 13 digits.
$ ^{2} $nd 8.0.0.0.0.0.0.0.0.0
Display Indicators
| Indicator | Meaning |
| 2nd | The calculator will access the second function of the next key pressed (appears when you press [2nd]). |
| FIN | The calculator is in the financial mode. |
| STAT | The calculator is in the statistics mode. |
| Note: No indicator displays when the calculator is in profit margin mode. | |
| Begin | The calculator computes annuities as beginning-of-period payments rather than end-of-period payments. (Displayed only in the financial mode.) |
(continued)
| Indicator | Meaning |
| InDep | The displayed result is for the independent variables (x values). (Displayed only in the statistics mode.) |
| Dep | The displayed result is for the dependent variables (y values). (Displayed only in the statistics mode.) |
| \Sigma prn | The value in the display is the summed principal over a range of payments. (Displayed only in the financial mode.) |
| prn | The value in the display is the principal for a single payment. (Displayed only in the financial mode.) |
| \Sigma int | The value in the display is the summed interest over a range of payments. (Displayed only in the financial mode.) |
| int | The value in the display is the interest for a single payment. (Displayed only in the financial mode.) |
Arithmetic Operations
Entering Numbers
0 - 9 (Digits)—Enter digits into the display. You can enter a maximum of 10 digits and a decimal point.
(Decimal Point)—Enters a decimal point.
+/- (Change Sign)—Changes the sign of the number in the display. To enter a negative number, first enter the number as a positive value and then press +/-.
Arithmetic Keys
⊕, ☐, ☒, ÷—Perform the arithmetic operations of addition, subtraction, multiplication, and division.
(Equals)—Completes all pending operations and displays the result of a calculation.
Correcting Errors
Correcting Entry Errors
CE/C (Clear Entry/Clear)—To clear a numerical entry, press CE/C once; then enter the correct number. To clear all pending operations and begin the calculation again, press CE/C twice.
(x Exchange y)—Exchanges the values of x and y. If you enter x and y in the incorrect order, press to reverse them. Then complete the calculation.
(Backspace)—Removes the last digit or decimal point from the displayed number if you have not yet pressed an operation key (⊕, ▔, ×, ÷, etc.). This key is useful for correcting entry errors without having to clear the display and start again.
Correcting Immediate Functions
You can often correct an immediate function by performing the “reverse” operation. For example, if you press $ \boxed{2nd} $ $ [x^2] $ by mistake, you can correct the operation by pressing $ \boxed{2nd} $ $ [\sqrt{x}] $.
Display Formats
Floating-Decimal Format
The calculator normally displays numbers in “standard” floating-decimal format, in which numbers are displayed in the range -9,999,999,999 to -0.000000001, 0, or 0.000000001 to 9,999,999,999. If the result of a calculation is too large or too small to be displayed in the normal format, it is displayed in
