Manual / Guide · c. 1970
The 20-page instruction book of the QT-8D: keys, the combined += and -= keys, worked examples of every operation, decimal point call-back, overflow, and specifications (78 kHz clock, four ELSI chips).
SHARP ELECTRONIC CALCULATAR wm csi INSTRUCTION MANUAL | | Downloaded from www.Manualslib.com manuals search engine INTRODUCTION PEATURES ..2...5.....50 HINTS .....-0020.,. ee 8 SPECIFICATIONS ........2.0 5 KEY IDENTIFICATION BEFORE OPERATION ....°.. . 6 OPERATION... 2.4... Gg INTRODUCTION Sharp's revolutionary Micro Compet OT-8D incorporating four ELSIs (Extra Large Scale Integrations) with one 4-phase clock generator marks another major advance in the world of space-age miniaturization. Years of pioneering research and achievement in electronic engineering have enabled Sharp to develop an exceptionally remarkable mini- calculator that offers maximum portability and a wide range of mathematical versatility. The QT-8D is thoroughly reliable and carries out calculations with amazing speed and efficiency. This booklet provides a detailed explanation of the Micro Compet’s operation. Downloaded from www.Manualslib.com manuals search engine FEATURES 1. ULTRA-COMPACT AND EASY TO HOLD ELSI miniaturization considerably reduces overall dimensions and weight; increases de- pendability and lowers operating costs. Weighs only 1.4 kg (3.1 Ibs.). 2. SIMPLE OPERATION Only four function keys. No special training is required. Simply touch the keys and the answer to almost any practical mathematical problem appears instantly. 3. UNDER-FLOW SYSTEM Simplifies long answers. For example, 8 digits x 8 digits = 16-digits can be carried out despite the 8 digit display panel. Counting from the left the first 8 digits of the answer are displayed and the rest discarded. 4. DECIMAL POINT CALL BACK SYSTEM If the integral portion of the result exceeds 8 digits, the decimal point functions even though it doesn’t appear on the display panel. 5. SOFT LIGHTING GREEN DISPLAY Our specially developed non-glare green display panel eliminates eye-strain, improves reading ease. 6. MINUS SIGN INDICATOR Automatically turns on when the result is negative. 7. DOUBLE-SETTING PROTECTIVE KEYS Eliminate. error, speed up operation. ...no more worry about double-setting of keys. Downloaded from www.Manualslib.com manuals search engine 8. OVERFLOW ERROR CHECK If the result exceeds 16 digits, all the decimal points turn on and the calculation stops. More than 8 digits can not be entered. 9. MINIMUM POWER CONSUMPTION The 4-phase logic features require minimum power consumption. HINTS ——— 1. As the Micro Compet uses highly sensitive ELSIs and electronic components, avoid placing the unit in hot, dusty or humid locations, or on surfaces subject to excessive vibration. 2. Do not jolt or drop the unit. 3. Do not stand it on its side or turn it over. 4. Do not place articles on top of the unit. 5. When cleaning the cabinet, use the cloth enclosed. Do not use a wet cloth or any organic solutions such as kerosene or benzine. 6. When not in use, keep the unit covered. Downloaded from www.Manualslib.com manuals search engine SPECIFICATIONS Power source: AC 100/110/120/200/220/240V 50 — 60 Hz Capacity: 8 digits Addition & Subtraction: 8 digits + 8 digits = 8 digits Multiplication: 8 digits x 8 digits = 8 digits Product: up to 8 digits In case that a product exceeds 8 digits, lower digits are discarded, but the decimal point is kept in a register and called back by decimal point call back system. Division: 8 digits + 8 digits = 8 digits Decimal point: Complete floating decimal point with call back system Negative: Minus sign indication Calculation speed: Addition & subtraction - 20 milliseconds Multiplication - 150 milliseconds Division - 200 milliseconds ELSI: 4 IC: 1 IC (for a clock generator) 1 Modules: s Transistors: 5 Diodes: 11 Clock pulse: 78 kHz Temperature: 0 - 40°C (32 - 104°F) Power consumption: AC 7W (maximum), AC 4W (normal) Dimensions: 135mm(W) x 72mm(H) x 247mm(D) 5-5/16''(W) x 2-13/16"(H) x 9-11/16"(D) Weight: 1.4kg (3.1 Ibs.) Downloaded from www.Manualslib.com manuals search engine KEY IDENTIFICATION ({) ~ (9) Numeral keys. Used for entering numbers. TT (G2) Determines the decimal point position. (c} Clears the calculator and corrects mistaken entry. (See Ex. 6.) (+=) When (x) key is set, multiplication is carried out. When key is not set, addition is carried out. (5) When (x= key is set, division is carried out. When key is not set, subtraction is carried out. Used when carrying out multiplication and division. BEFORE OPERATION | When the power is turned on, press the (c} key twice to clear the machine. Example power on 7567.0987- (appears at random.) press key (first time) .0225- (appears at random.) press key (second time) OOOOOO00 Downloaded from www.Manualslib.com manuals search engine OPERATION Connect power cord to an electric outlet, and turn the unit on. Be sure to press key twice before starting calculations. 1. ADDITION Ex.1—1 123.1 + 864.2 Steps: operation display 1 123.1 123.1 2 123.1 a 864.2 864.2 4 (cS) 987.3 Ex.1—2 2.3 + 2.45 + 2.678 Steps: operation - display 1 L3 23 2 2.3 3 2.45 2.45 4 += 4.75 5 2.678 2.678 6 7.428 7 Downloaded from www.Manualslib.com manuals search engine Ex.1—3 12.345678 + 1234.5678 display 12.345678 12.345678 1234.5678 1246.9134| 78 | < invisible part note In this calculation, the decimal point is aligned to that of addend and the lowest two digits of the answer which exceeds 8 digits, ‘’78,’’ are discarded. display 8246246. 8246246. 3963966. 12210212. 98457823. 11066803 35. 00000000 Steps operation 1 12.345678 2 &) 3 1234.5678 4 (=) NOTE: Underflow system Ex.1—4 Steps: operation 1 8246246 2 3 3963966 4 += 5 98457823 6 += J 35 8 z= NOTE: In continuous addition: 8 8246246 + 3963966 + 98457823 + 35 < invisible part note . If the answer exceeds 8 digits, the last digit is shifted one digit to the right Downloaded from www.Manualslib.com manuals search engine with the decimal point according to the underflow system as shown in step 6. 2. However, if the addition is performed continuously when the decimal point is not displayed, all decimal points turn on and the calculation stops. 2. SUBTRACTION Ex.2—1 358.8 — 1241.6 — 27.5 Steps: operation display 1 358.8 358.8 2 358.8 3 1241.6 1241.6 4 lad 882.8— 5 27.5 27.5— 6 sof 910.3— 9 Downloaded from www.Manualslib.com manuals search engine 3. MULTIPLICATION Ex.3—1 LixZ2 Steps: operation display 1 1.1 1.1 2 [x=] 1.1 3 2.2 a 4 a 2.42 Ex.3-—2 ZA22% 30x44 «x 5.5 Steps: operation display 1 Fe pit 2 22 3 ae Re 4 += 7.26 5 7.26 6 4.4 4.4 7 ‘lio 31.944 8 31.944 9 5.5 5.5 10 = 175.6920 10 Downloaded from www.Manualslib.com manuals search engine EX. 33 824005.1 x 930047.2 Steps: operation display note 1 824005.1 824005.1 2 824005.1 3 930047.2 930047.2 4 += 76636363 < invisible part 5 76636363 decimal point call back 6 .0000001 =| 0.0000001 7 = 76636.363 [0000) correct number of digit (12) NOTE: 1) When the result of calculation exceeds 8 digits, only the upper 8 digits are displayed. (step 4) 2) In the above case, the decimal point call back system indicates the number of digits in answer. 3) In the above example, by multiplying 76636363 by 0.0000001 ( step 6), the decimal point is called back as 76636.363 (step 7). This indicates that the decimal point is at the fourth digit from the last figure (step 4). 4) Thus, by this operation, the correct integer digits of product are known in the above example... 12 digits. 11 Downloaded from www.Manualslib.com manuals search engine Steps: 1 = minus sign indicator on 2 4.— q 3 4.— , 4 5 5.— | | 5 20.— z So eR a , Ex.3-—5 (—4) x (—5) minus sign indicator on minus sign indicator off 12 Downloaded from www.Manualslib.com manuals search engine 4. DIVISION Ex.4—1 264 + 12 Steps: | operation display 1 264 264. 2 264. 3 12 1Z. 4 | =) 22.000000 Ex.4-—2 256 + 12> 056223 Steps: operation display note 1 256 256. 2 256. 3 12 12. 4 21.333333 The 7th decimal place is discarded. 5 («3 21.333333 6 .56 .56 7 38.095237 The 7th decimal place is discarded. 8 38.095237 9 25 2.3 10 16.563146 The 7th decimal place is discarded. 13 Downloaded from www.Manualslib.com manuals search engine Ex.4—3 (—264) + 12 minus sign indicator on er ce Downloaded from www.Manualslib.com manuals search engine 5. MIXED CALCULATION Ex 5. (5+ 12) x 0.2+ 48 — 16 Steps: 1 2 3 4 5 6 7 8 9 + +). fx) fF ~ li] 3 il » PGs wi} on 51.4 16. 35.4 35.4 4. 8.8500000 ae - © iti (o>) — Ww —_ +} ait 15 Downloaded from www.Manualslib.com manuals search engine 6. CORRECTING MISTAKES Ex. 6 3x 5 (mistake) 4 (eonrect Steps: . (mistake) (correct) 16 Downloaded from www.Manualslib.com manuals search engine 7. OVERFLOW ERROR 1) Addition Ex.7—1 23456789 + 98765437 + 24689 Steps: operation display note 1 23456789 23456789. 2 (= 23456789. 3 98765437 98765437. 4 += 12222222 < invisible part 5 24689 24689. 6 = 00000000 2) Multiplication Ex.7—2 642895 x 56782 x 425566 Steps: operation display note 1 642895 642895. 2 642895. 3 56782 56782. 4 += 36504863 < invisible part 5 cS) 36504863 6 425566 425566. aa 7 = 00000000 17 Downloaded from www.Manualslib.com manuals search engine 3) Division Ex.7—3 89898989 = 0.0000012 + 0.0000023 Steps: operation display note 1 89898989 89898989. 2 x=] 89898989. a .0000012 0.0000012 4 74915824 < invisible part 5 74915824 6 .0000023 0.0000023 7 00000000 NOTE: As seen in examples 7 — 2, 7 — 3,.if the whole number exceeds 16 digits, all decimal points turn on and the calculation stops. 18 Downloaded from www.Manualslib.com manuals search engine 'SHARP ELECTRONICS CORPORATION CORPORATE. HEADCUARTERS AND EXECUTIVE OFFICES: 10 Keystone Place Paramus, New Jersey 07652 Phone: (201) 265- 5600 REGIONAL SALES OFFICES AND DISTRIBUTION CENTERS: ‘Eastern: 10 stone Place Paramus, New Jersey 07652 Phone: (201) 265-5600 ', Midwest: 4 infield Road, Country Side, La Grange, IIlinois 60525, Phone: (312) 242- 0870 Western: 2158 Wilmington Avenue, Long Beach, California 90810, Phone: (213) 830-4470/71/78 PRINTED IN JAPAN Downloaded from www.Manualslib.com manuals search engine