Editing TI-BASIC (section)

==== TI-83/84 (Z80) ====
On the TI-83/84, the programmer can create lists whose names are up to five characters.  All other data types are limited, such as the 27 real or complex variables, and a number of predefined variable names of other types (e.g., matrices have to be one of the ten variables <code>[A]</code>-<code>[J]</code>).  On the TI-83/84 certain variables such as <code>Ans</code> and the finance variables have fixed addresses in RAM, making them much faster to access than the 27 letter variables.  <code>Ans</code> acts as a special variable containing the result of the last evaluated code.  A line with just a variable will still be evaluated and its contents stored in <code>Ans</code> as a result.  Because <code>Ans</code> is reevaluated so frequently it most often is used to store very temporary calculations or to hold values that would otherwise be slow to access such as items from a list.  All variables are global.