Numbered flags may be set to specify which of three denominator systems is to be used: most precise denominator, factors of the maximum (for example 2, 4, 8, 16, when the maximum is 16), or a fixed denominator. 0000001190 00000 n
The key to this is the RPN memory stack, in which the … Useful to insert a single REGX, Y, Z or T instruction for a RCL stack register step. The case features many design elements from 1970s HP calculators such as the ground-breaking HP-65, including a black case with silver-striped curved sides, slope-fronted keys, and gold and blue shift keys.  The permanently allocated variables and the statistics registers may also be accessed indirectly, using negative sequence numbers of -1 to -32. It was initially supplied with a hard zippered clamshell case with a pocket for notes, and a printed manual, but this was later changed to a slipcase made of vinyl-covered cardboard with elastic sides and velvet lining, and a CD-ROM containing a PDF manual. , Response to the calculator's logic has been mixed. Although it is a successor to the HP 33s, it was introduced to commemorate the 35th anniversary of the HP-35, Hewlett-Packard's first pocket calculator (and the world's first pocket scientific calculator). Two vectors of similar dimensions may be added and subtracted, and multiplied to give their dot product. Program execution can be interrupted or resumed by pressing the R/S ("run/stop") key, and the program step pointer can be moved using the ↑ and ↓ keys.  It is built using 25 screws for rigidity and ease of maintenance. , The 35s's lack of communication abilities makes it acceptable for use in some professional examinations where more powerful calculators would not be. The calculator is powered by two CR2032 button cells, which it is advised to replace one at a time, to avoid memory loss.. The indirect variables are allocated automatically; storing a non-zero value in one results in the allocation of all variables with sequence numbers up to and including the one specified. 0000002440 00000 n
Regardless of which display base is set, non-decimal numbers must be entered with a suffix indicating their base, which involves three or more extra keystrokes.. Each stack level can contain any of the data types supported by the machine: real number, complex number, or vector. The HP 35s uses either Reverse Polish Notation (RPN) or algebraic infix notation as input. 232 18
Level X appears on the lower line of the display and level Y on the upper line.  While welcoming the improved handling of complex numbers compared to the 33s, the incomplete support for them has been criticised. There are also two built-in entries in the equations list, to allow solving all variables in a system of linear equations. The faceplate is metal, bonded to the plastic case. The entry mode can be easily changed by the user. In keeping with the calculator's retro theme, conversions between Imperial/US units and the equivalent standard metric units feature prominently on the 35s's keypad. Two small arrow symbols on the display indicate if the actual value is slightly above or below that displayed. The above example of adding 12 + 34i and 56 + 78i then becomes: 12i34↵ Enter56i78+. Steps which specify values or equations occupy more memory, as indicated above. The expression appears on the upper line of the display, the result on the lower line. 0000100578 00000 n
 Inverse and hyperbolic trigonometry functions cannot be used with complex numbers. 0000002403 00000 n
The 35s's statistics capabilities are fairly standard. There is no connection between program labels and the variables of the same names. The calculator is entirely self-contained; there is no facility for upgrading the firmware, nor for loading/saving programs and data. 0000001521 00000 n
Re: HP-35s tip: Stack review in RPN Message #7 Posted by Gene Wright on 20 Sept 2007, 12:23 p.m., in response to message #5 by Meenzer. %PDF-1.4
 Shortcomings which have been identified include the lack of any facility for communication with a computer (for loading and saving programs and data), and sluggish performance. As in normal operation, programming can be done in either RPN or algebraic (infix) mode. In non-decimal bases, the word length is fixed at 36 bits, and uses two's complement negation. The 35s supports both RPN and algebraic entry modes. The 26 alpha-labelled variables and the six statistics registers are permanently allocated; the rest of the memory space can be occupied by up to 801 more variables which can only be accessed indirectly. The HP 35s (F2215A) is a Hewlett-Packard non-graphing programmable scientific calculator. Support for vector operations is new in the HP 35s. In the case of solving, the program is treated as an expression whose return value (the value left on the stack) should be zero. For example, the sequence 3.15.16 →cm converts 3 15⁄16 inches to 10.0 cm (approximately). They are stored in a list which is accessed with the EQN key, allowing the user to scroll through the list, add, edit and delete equations, and select an equation to be processed.