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
Opcode Operand Description RIM None Read Interrupt Mask — This is a multipurpose instruction used to read the status of interrupts 7.5, 6.5, 5.5 and read serial data input bit. — The instruction loads eight bits in the accumulator with the following interpretations. — Example: RIM
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). — Example: EI
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