commodore Models SR8120D SR8140D SR890D Scientific Electronic Calculators Owners Manual 1 TABLE OF CONTENTS Description Page Keyboard Layout 4 Key Index 5 Introduction 6 Display Description 8 Data Entry 9 Clear Key 9 Four Function Arithmetic 10 Chain Calculations 10 Correcting Operations 11 F Key 12 Using the Memory 13 Chain Calculations Using the Memory 14 Exponent Key 15 Power and Rool Keys 16 Chain Calculations Involving Power Key 16 Binary to Decimal Conversion 17 Amorlization Using Power and Memory 18 Hypotenuse Calculations 19 -... 1- -­ - Description Page Description Page Radius Calculation s Using Pi 20 Appendix 0 Transcendental Functions 21 Service Information Trigonometric Functions 24 a. Low Power 31 Degree Mode 24 b. Shipping Instructions 31 Ra dian Mode 25 c. Temperature Parameters 31 Radian Conversion 26 Appendix E Guarantee 32 Sales and Service Centers 33 Appendix A Improper Operation 27 Over/low 27 Underflow 27 Appendix B Operating Accuracy 28 Appendix C Power a. AC Operalion 29 b. Battery Operation 29 c. Adapter Data 30 2 3 ,--- - - - --- --- - - , KEYBOARD KEY INDEX This index permits quick page location of the description and/or the fi rst use of each function key. C 9 16 + / - 10 x 10 20 = 10 10' ex 10 21 + lID Oi 11 10' 21 e._ 11 sin-I COS-I tan-1 12 21 G •••• 13 .. 13 " " 24 13 13 24 sin-1 24 STO 2 15 24 80000 16 cos-' 24 00000 24 tan-' 24 5 r INTR ODUCTION Thank you for selecting our new scientilic They have been designed to give you a thor­ calculator. ough understanding of all functions. Profici· ency is gained by practice. Once you discover II represents the finesl achievement in solid how easy your mini-computer is to operate, state large scale integrated/ metal oxide silicon it will become an essential, enjoyable aid to technology, you in every area of computation. The commonsense logic of this scientific notation calculator is the key to your mastery o f it. You are able to enter basic assignments just as you would write them down on paper. A special note concerning display capacity For eJlample, 4 x 5:co ,is entered just as you and machine logic. see it. Higher math arguments Bfe accom­ This book has been prepared to illustrate the plished on your mini-computer by again enter­ operation 01 a 14-digit machine. ing examples as they Bfe commonly written. In the event you have selected a machine with Thus, the Log 019- the Log of 4 is inde)(ed: a 12- or 9-digit capacity, you are of course 9 l og-4 Log - . restricted to an entry limited by the number of digits in the mantissa and results will be This emphasis on academic principles is a lruncated in accordance with the capacity of consistent theme wh ich runs throughoullhe the display. This in no way alters the accuracy logic 01 your new mini-computer. of your machine as the extra digits are relained within the unit's logic for continued compu­ Students will appreciate the fact that most lal ion. Thus, you can work all o f the problems math concepts have been programmed into in this manual. the logic system. Among these basic tenets are such principles as any number raised to The treatment of numbers between +' and the zero power equals one; and zero raised - 1 differs among models. In all instances both entry and result are accurate. However, some to any power (except zero) equals zero. As can be seen, resul ts will be precisely dis­ models will express these values in scientific notation. played for immediate comprehension. Enter: Rea d: In short, our Scientific was designed by professionals for professionals and students Example A. .002 X 2. -03 alike. It has been developed as an easy-to­ understand, easy-to-operate machine. Please Example B. .002 X 0.002 read through the pages of this manual care­ fully. Become familiar with the keyboard and Bolh results are identical. its characteristics. Work through the examples. 6 7 NUMERICAL ENTRY sign of exponent: - or +, blank implies positive o through 9 • +/- EE exponent field: two digits maximum Sign El""n_" sample display: J~~~I~. Eo """ ... n l Entry: A number (the mantissa) is entered , just as written using the keys 0 Ihrough 9. (14 digits): 0.123456789 90 The sign of the mantissa can be entered at any time during a numerical enlry by pres­ (12 digits): 102.34578 99 sing the change sign key + /- . The sign (9 digits): 123.45 of the exponent can be Changg pressing .. the change sign key aUer the key sign mantissa: or + , blank on (enter exponent key) has been prm.ed. display implies a positive number The exponent lield is blank until I..:l.3I is mantissa: 10 digit maximum In 14·digit entered. display C 8 digit maximum in 12-digll The clear entry/ clear key. Pressing the display. C during or immediately aller a numer· 5-dlgit maximum In 9·digit ical entry will clear the display, Only prior display. entries are retained intact. Pressing the C key in all other cases clears your Special Ca se: A result between 1 and -1 calculator; Memories are not cleared. which has an exponent -01 is displayed in floating notation with a leading zero. This Enter: affects the display only. Th e logic 01 the calcu­ 2 3 4 = 6 lator realizes the true 10-digit result and the + c c ten digit accuracy Is retained in the machine. Cl n ' Enl'Y Enter: See Displayed: 2 3 0.666666666 = In the above example, we wished 10 add 2 Subsequent chain calculations wifl be com­ and 4 but entered 3 by mistake. Pressing puted using the true result retained internally C and entering 4 corrects the error in scientific notation: and allows further computation. The l inal 6.666666666 - 01 C clears the calculator. 8 9 FOUR FUNCTION ARITHMETIC Enter: Read: Explanation: + x + 2.4 The result of the division 12 + 5 is displayed and Example: divide is entered Enter: Read: Explanation: .3 0.3 Enter.3 3 + 1- x 3. Enter - 3 and multiply = 8, The result of 3 ; 4 + .3 1.2 m +1- 2 1.2 - 02 Enter 1.2 x 10- 2 which is 8 in display = - 0.036 Perform multipli­ cation and display result CORRECTING OPERATIONS Example: Calculate 3 x 4 CHAIN CALCULATIONS Example: Enter: Read: Explanation: 3x4 Calculate - 5- + .3 3 + 3. Enler 3. We wish to multiply but en tered + by mistake. EKplanatlon: Enter: Read: x 3. Enter the correct function key Enter 3 and multiply 3 x 3. 4 4. Now enter 4 4 4. Enter 4 = 12. The result 01 3 x 4 is displayed 12. The mu ltiplication 3 x 4 is In this manner any of the "four function" keys performed, the result, 12, (+ - can be over wrillen by another; Is displayed and divide is x -;-) entered. the final entry will be executed, For example: 5 5. Enter 5 Enter: Read: Elplanation: 3 x + 4 = - 1. The last lunclion pressed, (-) is executed. 10 11 I U,. oflh. D F,"";,, K"~ USING THE MEMORY Store: STO 2 Your mini-computer has 29 keys, one of which I!Z.!II is a special function key marked "F," The store keys refer to the two memory The application of this key enables you to registers and they store data for future use. increase the feature range of your machine by When mliII is pressed, the value currenlly releasing twelve additional operations. on the display will be copied into Memory Register 1. Similarly, when the iii key is Nine of the 29 keys are inscribed with upper ~as a prefix to the memory key case functions. If anyone of these keys is ~,the displayed data is copied into pressed the lower case function is executed. Memory Reg ister 2. Any data stored in the However, if the II key is indexed immediately register prior to pressing the respective STO prior 10 pressing one of the " double function" key will be lost. This is referred to as "writing keys, the upper case function is performed. over." Recall: mil and RCl2 Example: These keys are used to recall data stored in Enter: Read: Explanation: their associated memory registers. The value stored in memory is copied onto the a. 211 3 = 8. Ra ise 2 to the display; the value on display prior to recall third power. is lost while the value stored in memory is unaltered. To recall data in 5TO 2 ,Press b. C a13 \Iy 3= 2. Obtain the key sequence II RCl 2 . cube root of 8. Example: Enter: Read : Explan ation: 5 5. Enter 5 mJI 5. Copies 5 into memory register 1 6 6. Enter 6 , 6 5T02 6. Copies6 into memory register 2 12 13 Enter: Read: Ellplanation: Enter: Read: IIIDI 5. The content 01 Memory 1 (5) ® 3 + S +IimII= 18. is copied onto the display. Five remains in Memory 1. The value in Memory 1 (10) is added to 8 DRCL2 6. The content of Memory 2 (6) and the result is displayed. Memory 1 is copied onto the display. is unaffected. Six is retained in Memory 2. 3 x 5 x 4 -:- 6 = 5TO 2 10. Clear: o n An individual mamory register can be cleared by entering the key sequences: The result of the calculation is displayed and stored in Memory 2 for future recall. C ~ Clears memory register 1. C STO 2 Clears memory register 2. III 3 x 4 -:- II RCL 2 = 1.2 The C key need not be entered if O.