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This instruction tests for the presence of the onboard LCD port ("RUT" = "aRe U There?", a hangover from old telex/twx terminology). Naturally, any board that possesses an LCD port will report it as being there. The result is pushed into X as a True. If the board does not have an LCD port this instruction will result in a fatal runtime error, and your program will re-start.
In general all SPx peripherals must respond to an RUT poll. With external peripherals the usefulness of an RUT is to allow a system to determine its own configuration. With onboard peripherals it is included for consistency but is of little practical use.
This instruction cannot detect the absence or presence of a LCD module plugged into the LCD port. It only tells you that the board has an LCD port.
Note: This instruction modifies UV
Dialect exclusions: Not available in dialects before 9. Also, not available on SPLat controllers that do not have onboard LCD support (please check the documentation for your specific board and Firmware version).
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