If you know which type yours is, you can write that here. This calculator has an ENTER key (big key, middle of bottom row), and does not have an = key.Īlgebraic calculators can be further subdivided into AOS and DAL. On an RPN calculator, you type "2 ENTER 3 +". To add two numbers (say, 2 & 3) on an algebraic calculator, you type the keys "2 + 3 =". Does your calculator use algebraic or RPN (reverse Polish notation) logic? How do you tell? An algebraic calculator has an = key An RPN calculator has an ENTER key. (Provided by the author of this page.)īottom of page return links and contact information Price: $235 (Both versions were introduced at this price.- Picture of HP-11C keyboard. Three quarter view of a closed HP-28C (~36K) >LCD moved a string into the LCD.īoth versions used a Saturn architecture processor. The LCD> command created a string that contained the bits of the current LCD display which could be stored, altered, and printed. Unlike the USER menu which showed the objects in the current directory, the CUSTOM menu was set by a command and stayed the same even as the user moved through the directory structure. The user could define a menu of objects/commands with the MENU command and then view this menu with the CUSTOM command. CLUSER purged a directory including non-empty subdirectories The top directory was HOME and the PATH command displayed the current directory path. The new directory would appear in the USER menu just like any other object. To create a directory, the user entered directory name on the stack and entered the CRDIR command. Directories allowed variables and programs to be grouped together and to allow sets of variables with the same names to be defined in separate directories. The HP-28S replaced it a year later with 32K bytes at the same price. The HP-28C was introduced with 2K bytes of storage. The warning was not heeded by all HP-28C owners and System RPL programming by users was born. This was the entire description of SYSEVAL. You can display the version number of your HP-28C by executing # 10 SYSEVAL (assuming DEC base, which is the default base.)" SYSEVAL evaluates the system object at the absolute address #n. Use SYSEVAL only as specified by Hewlett-Packard applications. General use of SYSEVAL can corrupt memory or cause memory loss. "SYSEVAL is intended for use by Hewlett-Packard in application programming. The HP-28C went further by also showing the proper arguments to each command. Like the HP-41C, the HP-28C provided a built-in catalog of commands. Instead, binary numbers were indicated by preceding them with a "#". Being an RPL calculator, it was not necessary to enter a special mode to work in binary as was the case with the HP-16C. In addition to the usual math functions, the logical functions such as AND, OR and XOR were provided as well as rotates and shifts. The word size could be set from 1 to 64 bits, and the display base could be binary, octal, decimal or hexadecimal. Binary MathĪ substantial set of binary math functions were provided. Plotting was a convenient way of finding zeros, minimums and maximums of expressions. The user had control over the scale and position and could move the cross hairs to a place on the plot and have the calculator send the coordinates to the stack. With its new dot matrix screen, the HP-28C was HP's first pocket calculator to display graphs. To convert from one unit to another, the user entered the number (followed by enter) and then entered the units to convert from and to (either via the unit catalog or by typing them on the alpha keypad.) The convert button was then pressed to do the actual conversion. The calculator came with a large library of units and allowed the user to build more complex unit strings. Like the HP-18C, the HP-28C combined the ease of use of TVM solvers with the power of general solvers. Rather than using the same key to set or solve for a variable depending on whether a number had just been entered, the HP-28C user pressed the key alone to set any variable and pressed SHIFT followed by the same key in order to solve for it. The HP-28C included a solver that was similar to the algebraic solver in the HP-18C, though the HP-28C could solve both algebraic and RPL expressions (programs). This page only describes new features which are not obviously RPL-related, though this is sometimes a fine distinction. Because the HP-28C was the first full RPL calculator, most of its new features are described there. To understand the HP-28C, the reader should first visit the RPL page.
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