TRON command

"TROFF" redirects here. For the document processing system, see troff.
For other uses, see Tron (disambiguation).

TRON is a debugging command in old dialects of the BASIC programming language. It is an abbreviation of TRace ON. It was used primarily for debugging line-numbered BASIC GOTO and GOSUB statements. In text-mode environments such as the TRS-80 or DOS, it would print the current line number which was being executed, on-screen. In a windowed environment, when the TRON command had been executed, a window would indicate the line number being executed at that instant. This command's opposite is TROFF, or TRace OFF, used to turn off command tracing.[1]

TRON and TROFF were included in Altair Extended BASIC (written by Microsoft) in 1975,[2] and were inherited by many of the microcomputer and PC BASICs that descended from it.

TRON and TROFF were made obsolete by the advent of multitasking windowing environments, which permit a developer to switch back and forth between program output and source code. Modern IDEs take advantage of this to allow far more sophisticated debugging (line-by-line step-through execution of source code, examination/modification of variables, etc.). As a result, TRON/TROFF are no longer supported by most current BASIC dialects, including Microsoft Visual Basic.

References

  1. ^ "TRON and TROFF Statements Details". QBASIC News. 1988. Archived from the original on 2017-04-11. Retrieved 2013-02-17.
  2. ^ "Altair Extended BASIC Preliminary Documentation" (PDF). MITS, Inc. December 1975.


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