- HP-45 Prove it to yourself! See invitation inside Only the HP-45 has 9 addressable memory registers ... a 4-register The HP-45 has operational stack ... and a "Last x" register ! more functions, ~ , , Operation a1 more features , Stack , than any of the --<l LAST X I " Last x" competition. Register 9 That's why it does Add ressable Memory so much more = Registers for Inl I' The more entrles or intermediate solutions a calculator remembers for you, the less remembering----or writing down- you have to do. And the less chance Hewlett-Packard confidently invites you to for error. compare any other brand of scient ific pocket The HP -45 has more registers than any other brand of scientific pocket calculator against the HP-45 Advanced calculator-1 4. Fourteen reasons why the HP-45 solves even the most Scientific Pocket Calculator- feature against complex problems faster . > • easier .. and more accurately. feature. funct ion against function. The exclusive 4-register operational stacK retains as many as 4 intermediate solutions in sequence, and automatically positions them for use Don't Just compare what's visible on the on a last in , firs t out basis. At the proper time, the solutions are automatically outside. Compare what's inside, too. entered into the calculation being performed, so you don't have to re-enter them manually. It's this automatic operation of the 4-register stack that makes For example, compare the number of RPN (Reverse Pol ish Notation) possible. registers. Most other calculators have 1 or 2. The stac k design also permits X and Y register exchange, and roll-down The HP-45 has 14! of any entry to the display for review or other operation. The " Last x" register permits error correction or multiple operations. When Compare the type of logic used. The HP-45 a function is performed, the last input argument of the calculation is uses RPN (Reverse Polish Notationj­ automatically stored in the " Last x" register. This argument can be quickly "computer logic"- the only system that allows and easily recalled to correct an error, or to perform another operation using you to solve any problem without restru cturing, the same number. so there's far less chance for error. 9 addressable memory registers make data manipulation easy. You can store data (an intermedi ate solution, a constant, etc.) in any of the 9 registers And compare the pre-programmed · .. retrieve it instantly ... and even do register arithmetic (+ , - , x, + ) function keys. The HP-45 has 48 arithmetic, using or modifying data in any register. trigonometric, logarithmic and data The HP~45 uses RPN to give you manipulation operations. Yet it's still compact confidence in computation every step of the way enough to fit in your sh irt pocket. Most other scientific pocket • You see every interm ediate cal culators (and all of the bargain­ solution on the display. Thus it's Compare . and you'll quickly discover priced , limited-function calculat ors) easy to check the progress 01 that the HP-45 is exactly what you need to use algebraic logic. It's easy to your calcu lations as you go. No solve your problems . anywhere, anytime! Jearn, but there are some serious need to worry whether you 're drawbacks. going wrong ! If you're still using a slide rule, you'll fi nd For example, when usi ng it to • You can recall previously-entered that the HP-45 is up to 50 times faster ... and solve complex problems, you often data instantly. Just press the R~ far more accurate. have to restructure the problem to key to "roll down" the operational conform to the logic. (Then you worry stack, for review or other If you 're still tied down to cumbersome log whether or not you restructured it operation. and trig tables, you'll be happy to know that all properly, because if you didn't your RPN gives you " confidence in of the tables are pre-programmed into the answer will be wrong !) computation"-confidence that the The HP-45, however, uses RPN data was entered correctly .. that HP-45. All you need do is press a few keys! (Reverse Polish Notation)­ the intermediate solutions are what And even if you have access to an on-line " computer logic." It should take you they should be .. and that the final computer, the HP-45 can save you minutes, all of about two minutes to master, solution is free from error. and once you do ... Also, problem-solving is fast er, hours or days of waiting time ... by giving you • Every problem can be solved just es pecially with any calculation the answers you need when you need them. the way it's written, in natural, sequence involving arithmetic, Yes, compare the HP-45 ... try the HP-45 left-to-right sequence. No restruc­ trigonometric, logarithmic , power or turing .. no confusing rules to exponential functions. Not only is . .. and you'll see why it's now the standard remember. Regard less of the type there no restructuri ng to do, but, in of the industry! of problem, you can solve it using most cases, fewer keystrokes are j ust one simple sequence of steps! required. And, you don't have all • Yo u can start solving the problem those intermediate solutions to jot immediately. There's no need to down and re-enter, thanks to the think the problem all the way HP-45's operational stack and through beforehand. You can memory registers. even change your mind midway RPN-another Hewlett-Packard without having to start over! exclusive in pocket calculators! Unique " shift key" doubles the function of 24 keys Convert polar to rectangular The factorial function lets The Gold Key gives the HP-45 • coordinates or vice versa. you quickly calculate Vector calculations are combinations and increased capability with no increase in • size! Primary functions are labeled on the simple too! permutations keys, with alternate functions above. To Simply press this key to convert to polar Merely press the Gold Key, then the key utilize an alternate function, simply press coordinates, or press the Gold Key and for "n!" to quickly calculate the factorial the Go ld Key first, then the appropriate then this key to convert to rectangular of positive integers. Instead of spending key. coordinates. Vector calcu lations are many minutes on such problems, you can simple on the HP-45. To add or subtract do them in just seconds! vector components, you may combi ne the polar-rectangular function with the Two display modes accumulation function: " 1;+ ." offer versatility Unless programmed otherwise, the HP-45 automatically rounds off the display to two decimal places. But by pressing " FIX," then any digit key from 0 to 9, you can specify the number of decimal RCL places shown on the display (example Metric/U.S. unit constants are below). The full accuracy is always DEC, pre-programmed in for immediate RAD G U maintained internally. The fixed decimal display automatically overflows to fu ll conversion scientific display and underflows to zero You can quickly convert U.S. units to ENTERt metric units, or convert metric units to U.S. uni ts, for rapid calculation of problems involvi ng length, weight or Trigonometric functions may be volume. And you get 10-digit accuracy! performed in any of 3 selectable angular modes, with instant conversion to or from degrees/minutes/seconds You can perform trig operations in Fix 4 degrees, radians or grads (Eu ropean By pressing the Gold Key, then "SCI," These keys make system) simply by pressing the Gold Key, you can manually change the display to statistical then the appropriate mode key. All trig scientific notation (example below), 1...__ 1 analysis easy functions calcu late decimal angles in which is useful when working with very whichever angular mode is specified. The "1;+ " key provides a running total In a similar way, you can instantly large or very small numbers. You can when summing numbers, keeps track of specify the number of significant digits convert from an angle in any angular mode the number of entries and automatically to d / m/s (degrees/ minutes/seconds or displayed after the decimal point (from computes the sum of the squares. The o to 9) in either mode. hours/ minutes/seconds). For example, "x,s" key calculates the arithmetic mean 45.89° - 45 ° 53'24". The answer is and the standard deviation of the automatically rounded to the nearest numbers entered. The HP-45 can second. Or you can convert from simultaneously accumulate two sets of d/m/s to the equivalent decimal numbers. ang le. By changing angular modes between these steps, you can Scientific Notation 4 also convert any decimal angle from one mode to another. For th e natu ra l log, press " In" ; Calcul ate percentage To find th e sq uare root of a it takes t he log of the valu e problems by si mply pressing number, key in the number, displayed in base e (2.718 ., . ), "% " after entering the percent then press th e Gold Key, then Fo r the common log , press the Gold Key, value. There's no need to convert the key for "vx." The "x" in th e symbol then the key for " Iog" ; it takes the log of pe rcents to their decimal equivalent! represents the currently di splayed value, the value displayed in base 10. Press the Gold Key , then ., 6. %" to so you can calculate its square root instantly compute the percent difference without re-entering the number.