Editing TI BASIC (TI 99/4A) (section)

===Editing and running===
Unlike most BASICs of the era, TI BASIC did not provide a [[Full-screen writing program|full-screen editor]]. Instead, a [[line editor]] was provided, which allowed the user to add or edit one line at a time. Explicit line numbers were used to order each statement. It used a {{code|>}} prompt to indicate the current new line in [[direct mode|immediate mode]], as opposed to the more common {{code|READY}}.{{sfn|Guide1981|p=II-5}} Line numbers ranged from 1 to 32767, inclusive, and entering a line outside that range resulted in the "BAD LINE NUMBER" error.{{sfn|Guide1981|p=II-8}} Line entry was aided by the {{code|NUMBER}} command, available only in immediate mode, which entered ascending line numbers,{{sfn|Guide1981|p=II-26}} and {{code|RESEQUENCE}}, which renumbered an existing program.{{sfn|Guide1981|p=II-27}}

TI BASIC also included a number of [[debugging]] commands. {{code|BREAK}} worked something like {{code|STOP}}, stopping execution on certain lines. Unlike {{code|STOP}}, the exit to immediate mode did not occur on the line where {{code|BREAK}} appeared, but on the lines  {{code|BREAK}} referred to. For instance, {{code|BREAK 130}} would cause the program to exit to immediate mode whenever it moved to line 130. This could be used, for example, by inserting a single {{code|BREAK}} at the top of the program to control execution, rather than having to insert a {{code|STOP}} in the middle of the code. {{code|UNBREAK}} turned off existing breakpoints.{{sfn|Guide1981|p=II-33}} Additionally, {{code|TRACE}} printed out the line number of the currently executing line in angle-brackets: {{code|<100><110>}} etc, and {{code|UNTRACE}} turned it off.{{sfn|Guide1981|p=II-36}}