Texas Instruments TI-80 User Manual - Page 154
About TI-80 Programs, Last Entry as each command - series
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About TI-80 Programs Most features of the TI.80 are accessible from programs. Programs can access all variables and named items. The number of programs that the TI.80 can store is limited only by available memory. Notes about Programs Programs are identified by names of up to seven characters, beginning with a letter. A program consists of a series of program commands, which begin with a : (colon). A program command can be an expression (a command, usually a combination of variables, functions, and numeric values, that returns a value to ANS) or an instruction (a command, such as GRIDON or PT-ON(, that does not return a value to ANS). The TI-80 checks for errors when you execute the program, not as you enter or edit the program. Variables and lists saved in memory are global; that is, they can be accessed from all programs. Storing a new value to a variable or list in a program changes the value in memory during program execution. As calculations are made in programs, the TI-80 updates ANS, just as it would if the calculations were done on the Home screen. Programs do not update Last Entry as each command is executed. "Breaking" a Program Pressing ´ stops program execution. When you press ´ during program execution, the ERR: BREAK menu is displayed. ¦ To go to where the interruption occurred, select GOTO. ¦ To return to the Home screen, select QUIT. Memory Management and Erasing Programs The size of programs you can store is limited only by available memory. To access the MEMORY menu, press 2 ¯ from the Home screen. Memory status is displayed on the MEMORY CHECK RAM... screen. To increase available memory, you can delete items, including other programs, from the MEMORY DELETE... screen (Chapter 12). Note: Each token in a program takes 1 byte. For example, SIN 1.23 takes 5 bytes. 10-4 Programming
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