EI
Opcode | Operand | Description |
EI | None | Enable interrupt |
— The interrupt enable flip-flop is set and all interrupts are enabled.
— No flags are affected.
— This instruction is necessary to re-enable the interrupts (except TRAP).
SIM
Opcode Operand Description SIM None Set Interrupt Mask — This is a multipurpose instruction and used to implement the 8085 interrupts 7.5, 6.5, 5.5, and serial data output. — The instruction interprets the accumulator contents as follows. — Example: SIM
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