Texas Instruments TI86 User Manual - Page 31
Entering Numbers, Entering Negative Numbers
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Chapter 1: Operating the TI-86 19 The mode settings control the way the TI-86 interprets expressions and displays answers (page 34). The TI-86 on-screen division symbol is a forward slash ( à ), as in a fraction. Always use parentheses to clarify negation when you use conversion instructions (Chapter 4). When an entry is executed on the home screen, the answer is displayed on the right side of the next line. When you execute an instruction, Done is typically displayed on the right side of the next line. If an answer is too long to display on the screen, an ellipsis (...) is displayed, initially to the right. To view more of the answer, press ". When you do, an ellipsis is displayed to the left. To scroll back, press !. Entry Answer Entry Answer Entering Numbers A symbol or abbreviation of each key's primary function is printed in white on the key. For example, when you press \, a plus sign is pasted to the cursor location. This guidebook describes number-entry keystrokes as 1, 2, 3, and so on, instead of Y Z [. Entering Negative Numbers To enter a negative number, press a (the negate key), and then press the appropriate number keys. For example, to enter L5, press a 5. Do not attempt to express a negative number using T (the subtract key). a and T are two different keys with different uses. The order in which the TI-86 evaluates negation and other functions within an expression is governed by the Equation Operating Systemè (Appendix). For example, the result of L42 is L16, while the result of (L4)2 is 16. If you are unsure about the order of evaluation, use D and E to clarify the intended use of the negation symbol.
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