====== ON ======

[pet] [vic20] [c64] [c16] [cplus4] [c128] [x16] [m65]

The ''ON ... GOTO|GOSUB'' construct has multiple use cases:

  * ''ON <value> GOTO|GOSUB'' is used for multiple branching
  * ''ON ERROR GOTO'' is used for error trapping
  * ''ON <event> GOSUB'' is used for interrupt handling

===== Syntax =====

  ON <value> GOTO|GOSUB <label> [, <label> ...]
  ON ERROR GOTO <label>
  ON TIMER|RASTER|SPRITE|BACKGROUND|VBLANK GOSUB <label>

For more details, refer to:

  * [[v3:flowcontrol|]]
  * [[v3:error_handling|]]
  * [[v3:interrupts|]]