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Interrupt Disable Flag
From SnesLab
The Interrupt Disable Flag (I) exists on the 65c816 as bit 2 of the status register.
SEI sets it and CLI clears it.
This flag is automatically set whenever the processor begins servicing an interrupt.
See Also
Reference
- Pickens, John. NMOS 6502 Opcodes. http://www.6502.org/tutorials/6502opcodes.html#IFLAG