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1. A command line interface.

2. A 6502 instruction that clears the I (interrupt disable) flag, allowing IRQs to interrupt the code.

  • Function: 0 => I
  • Updates flags: . . . . . I . .
  • Opcode number: impl $58

Caution: Do not confuse this with the cli instruction of x86, which does the exact opposite.

As opposed to: SEI
See also: 6502 instructions | 6502 addressing modes