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HP has never made another calculator specifically for programmers, [2] but has incorporated many of the HP-16C's functions in later scientific and graphing calculators, for example the HP-42S (1988) and its successors. Like many other vintage HP calculators, the HP-16C is now highly sought-after by collectors. [14]
The calculator uses its logic to attempt to isolate the value of the required variable, after prompting the user for the values of the other variables. Since this process takes time, and the equation may have more than one solution, it is guided by two "guesses" which it assumes to have been provided by the user, in the stack's X register, and ...
The model HP-25C, introduced in 1976, addressed that shortcoming through the first use of battery-backed CMOS memory in a calculator, termed continuous memory by HP. Like all early HP calculators, the 25 used the Reverse Polish Notation (RPN) for entering calculations, working on a four-level stack (x,y,z,t). Nearly all buttons had two ...
RPL adds the concepts of lists and functions to stack-based programming, allowing the programmer to pass unevaluated code as arguments to functions, or return unevaluated code from a function by leaving it on the stack. RPL comes in two flavors: User RPL and System RPL. User RPL is the language that a user can program directly on the calculator.
The calculator had a four-register stack (x, y, z and t). The stack was represented in the operating manuals with the t register at the top, followed by the registers z, y, and x. The "enter" key pushed the displayed value (x) up the stack. Any binary operation popped the bottom two registers and pushed the result.
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Perhaps the HP-42S was to be released as a replacement for the aging HP-41 series as it is designed to be compatible with all programs written for the HP-41. Since it lacked expandability, and lacked any real I/O ability, both key features of the HP-41 series, it was marketed as an HP-15C replacement.
How a CD ladder works. Let’s say you have $30,000 to invest in a high-yield CD. You might put the entire lump sum into a long-term CD of 12 months or longer to earn a high rate of return.