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6502

5 bytes added, 23 September
/* Branch instructions and Interrupts */
If an interrupt is detected at any of these points (before the operand fetch or the page boundary fixup), the CPU will handle the interrupt immediately, interrupting the branch execution.
This behaviour was has not been fixed in the CMOS 65C02 as this is not really a bug. It's just a subtlety that one has to keep in mind when working with time-sensitive code.
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