Warranty types Warranty removed from product: This product was designated to be returned to HP. Thus, the warranty has been removed from this product. Product sold by third party: This product was sold by a third party. Any warranty support needed would be completed by the third party that sold the product. Product has been exchanged: This product has been exchanged for a new or refurbished product. Please use the product number and serial numbers of the new product to validate warranty status.
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Variables Instead Of Numbered Registers The calculator used the 27 lettered variables A-Z and i indirection rather than numbered variables. While these variables were used in much the same way as numeric registers, they were more than just a relabeling. The lettered variables were not allocated from memory until used and they could be individually deallocated by simply storing 0 in them. Z annunciator appeared. The letters A-Z where printed to the sides of the keys. All the variables could be scanned with the VAR command.
A single variable could be displayed without entering it on the stack by pressing VIEW followed by the letter. Programmability The programming features were impressive for a calculator of its price. The calculator used label addressing and allowed subroutine nesting to seven levels deep. To aid in navigating programs, line numbers began with the most recent label followed by two digits.
Like A For very long functions, the next lines were displayed as A. Unlike most previous models, this one checked for duplicate labels and produced an error message. Indirection was available via the i variable which was distinct from the I variable. Another new feature was the program checksum. This gave the user assurance that the program was entered correctly. In fact, in large program listings, HP typically listed a checksum every dozen or so lines so the user could find mistakes quickly.
Most program lines required 1. Any number fit on one code line but those code lines require 9. Although the calculator optimized integer numbers from 1 to 99 into 1. Integer, fraction, rounding, absolute value. To use the root finder the user wrote a function that accepted x, and left f x in the X register. After entering a single program, the user could solve for any variable.
The calculator then requested that the user input the other variables and solved for the unknown. The HPS offered a list of functions that few people would have dreamed of in for 0. In addition, it was tiny, light weight, simple to use and ran just about forever on batteries.
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