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On a single-step or immediate-execution calculator, the user presses a key for each operation, calculating all the intermediate results, before the final value is shown. [ 1 ] [ 2 ] [ 3 ] On an expression or formula calculator , one types in an expression and then presses a key, such as "=" or "Enter", to evaluate the expression.
A NOP (No OPeration) function was provided to allow a program step to be ignored. Due to the hard limit of 50 program steps, use of NOP was infrequent. The TI-57 used the "one step, one instruction" principle, regardless of whether one instruction required one or up to four keypresses.
The TI-36X series is one of the few calculators [5] currently permitted for use on the Fundamentals of Engineering exam. While TI offers other calculators eligible for use on the exam, the TI-36X Pro is the most feature full Texas Instruments calculator permitted. HP and Casio also make calculators permitted on the exam.
Up to 203 program steps are available, and up to 16 program/step labels. Each step and label uses one byte, which consumes register space in 7 byte increments. Here is a sample program that computes the factorial of an integer number from 2 to 69. The program takes up 9 bytes. The codes displayed while entering the program generally correspond ...
Here is a sample program that computes the factorial of an integer between 1 and 69 (70! needing an exponent greater than 99, the calculator's maximum). The integer is entered in the X register and passed as an input parameter when the program is run. The program takes up two registers, which is ≈14 bytes. Step Op-code Comment
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. There is no connection between program labels and the variables of the same names. As in normal operation, programming can be done in either RPN or algebraic (infix) mode.
Each card can be recorded on two stripes, enabling it to store two programs. Five registers are stored on the card; two registers are dedicated to the program code, the other three registers (D, E, F) can be used for code and/or numbers. Instructions occupy one byte, and a magnetic card can hold 120 instructions. The cards use a simple machine ...
The HP-65 had a program memory for up to 100 instructions of six bits which included subroutine calls and conditional branching based on comparison of x and y registers. Some (but not all) commands entered as multiple keystrokes were stored in a single program memory cell. When displaying a program, the key codes were shown without line numbers.